Caldwell Weather Records (USC00101380)

Record envelope, standing records and threshold days for Caldwell (USC00101380), Idaho, United States, with 94 years of record.

Key Facts for Caldwell

Caldwell (USC00101380) is a weather station in Idaho, United States at 43.67 latitude and -116.68 longitude, 722 m (2,370 ft) above sea level.
The station reports from 1904 to 1997, 94 years of record.
1,464 records set at Caldwell still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Caldwell set a daily record precipitation of 14.7 mm (0.6 in) on 25 May 1997.

About the Station

Location: Idaho, United States, 43.67 latitude, -116.68 longitude.
Elevation: 722 m (2,370 ft).
Period of record: 1904 to 1997, 94 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Caldwell. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Caldwell, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	18.9 C (66.0 F)	-35.0 C (-31.0 F)	n/a	n/a
Feb	21.1 C (70.0 F)	-29.4 C (-20.9 F)	n/a	n/a
Mar	28.9 C (84.0 F)	-21.1 C (-6.0 F)	n/a	n/a
Apr	34.4 C (93.9 F)	-11.1 C (12.0 F)	n/a	n/a
May	38.9 C (102.0 F)	-5.6 C (21.9 F)	n/a	n/a
Jun	41.1 C (106.0 F)	-1.7 C (28.9 F)	n/a	n/a
Jul	43.3 C (109.9 F)	2.8 C (37.0 F)	n/a	n/a
Aug	44.4 C (111.9 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	40.0 C (104.0 F)	-5.0 C (23.0 F)	n/a	n/a
Oct	34.4 C (93.9 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	26.1 C (79.0 F)	-20.0 C (-4.0 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-36.7 C (-34.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Caldwell still stand. 1985 holds the most, with 32.

Standing records at Caldwell by the year they were set
Year set	Standing records
1904	1
1905	18
1906	26
1907	20
1908	20
1909	16
1910	20
1911	17
1912	18
1913	21
1914	16
1915	12
1916	31
1917	24
1918	19
1919	27
1920	13
1921	14
1922	15
1923	13
1924	26
1925	7
1926	21
1927	24
1928	15
1929	30
1930	15
1931	22
1932	11
1933	22
1934	20
1935	23
1936	17
1937	25
1938	6
1939	10
1940	10
1941	4
1942	7
1943	10
1944	6
1945	4
1946	4
1947	9
1948	5
1949	12
1950	21
1951	7
1952	3
1953	21
1954	12
1955	20
1956	9
1957	11
1958	5
1959	7
1960	8
1961	22
1962	19
1963	22
1964	12
1965	15
1966	14
1967	17
1968	16
1969	13
1970	13
1971	10
1972	19
1973	14
1974	17
1975	22
1976	6
1977	19
1978	13
1979	12
1980	10
1981	7
1982	11
1983	12
1984	20
1985	32
1986	23
1987	21
1988	15
1989	17
1990	28
1991	10
1992	24
1993	24
1994	15
1995	19
1996	20
1997	11

All-Time Record Progression

6 new records

6 all-time records were set at Caldwell between 19 July 1960 and 15 August 1992. Each dot is a new record.

When Caldwell set new all-time records
Date	Kind	Detail
1960-07-19	Record high maximum temperature	Record high maximum temperature 43.3 C (109.9 F)
1961-07-14	Record high minimum temperature	Record high minimum temperature 23.9 C (75.0 F)
1961-08-04	Record high maximum temperature	Record high maximum temperature 44.4 C (111.9 F)
1975-07-06	Record high minimum temperature	Record high minimum temperature 24.4 C (75.9 F)
1984-07-26	Record high minimum temperature	Record high minimum temperature 25.0 C (77.0 F)
1992-08-15	Record high minimum temperature	Record high minimum temperature 25.6 C (78.1 F)

Wettest Day of Each Month

Jul: 63.5 mm (2.5 in)

The wettest day on record for each calendar month at Caldwell. The most was 63.5 mm (2.5 in) on 24 July 1913.

Record daily precipitation for each month at Caldwell
Month	Record daily precipitation (mm)	Date
Jan	26.7 mm (1.1 in)	18 January 1953
Feb	38.1 mm (1.5 in)	18 February 1906
Mar	27.4 mm (1.1 in)	17 March 1993
Apr	22.9 mm (0.9 in)	8 April 1935
May	33.3 mm (1.3 in)	21 May 1932
Jun	38.1 mm (1.5 in)	6 June 1908
Jul	63.5 mm (2.5 in)	24 July 1913
Aug	38.1 mm (1.5 in)	9 August 1930
Sep	36.3 mm (1.4 in)	13 September 1959
Oct	31.8 mm (1.3 in)	6 October 1925
Nov	30.5 mm (1.2 in)	24 November 1908
Dec	24.9 mm (1.0 in)	30 December 1924

Period of Record Coverage

1904 to 1997

94 years of record at Caldwell, 1904 to 1997. 2 years have data for under 90 percent of days and are left out of rankings: 1904, 1997.

Days with data per year at Caldwell
Year	Days with data	Share of year	Complete
1904	85	23%	No
1905	365	100%	Yes
1906	365	100%	Yes
1907	364	100%	Yes
1908	365	100%	Yes
1909	365	100%	Yes
1910	356	98%	Yes
1911	365	100%	Yes
1912	366	100%	Yes
1913	365	100%	Yes
1914	365	100%	Yes
1915	365	100%	Yes
1916	366	100%	Yes
1917	365	100%	Yes
1918	365	100%	Yes
1919	364	100%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	364	100%	Yes
1923	365	100%	Yes
1924	365	100%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	366	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	364	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	363	99%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	364	100%	Yes
1948	364	99%	Yes
1949	365	100%	Yes
1950	358	98%	Yes
1951	365	100%	Yes
1952	357	98%	Yes
1953	364	100%	Yes
1954	363	99%	Yes
1955	364	100%	Yes
1956	355	97%	Yes
1957	363	99%	Yes
1958	363	99%	Yes
1959	362	99%	Yes
1960	362	99%	Yes
1961	364	100%	Yes
1962	329	90%	Yes
1963	362	99%	Yes
1964	353	96%	Yes
1965	360	99%	Yes
1966	357	98%	Yes
1967	360	99%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	362	99%	Yes
1973	360	99%	Yes
1974	334	92%	Yes
1975	365	100%	Yes
1976	365	100%	Yes
1977	363	99%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	359	98%	Yes
1982	363	99%	Yes
1983	363	99%	Yes
1984	364	99%	Yes
1985	362	99%	Yes
1986	364	100%	Yes
1987	365	100%	Yes
1988	362	99%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	364	100%	Yes
1992	355	97%	Yes
1993	363	99%	Yes
1994	363	99%	Yes
1995	360	99%	Yes
1996	364	99%	Yes
1997	178	49%	No

Latest Records

Latest records at Caldwell
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
25 May 1997	Caldwell, US	daily rain	14.7 mm (0.6 in)	1.0 mm (0.04 in)	24 years	18 of 100 (Routine)
16 May 1997	Caldwell, US	daily high min	18.3 C (64.9 F)	1.1 C (2.0 F)	8 years	13 of 100 (Routine)
16 May 1997	Caldwell, US	daily high max (Tie)	35.0 C (95.0 F)	tie	24 years	4 of 100 (Routine)
15 May 1997	Caldwell, US	daily high max	35.0 C (95.0 F)	0.6 C (1.1 F)	63 years	28 of 100 (Routine)
20 March 1997	Caldwell, US	daily high min	8.9 C (48.0 F)	1.7 C (3.1 F)	90 years	40 of 100 (Notable)
20 March 1997	Caldwell, US	daily high max	26.1 C (79.0 F)	0.5 C (0.9 F)	8 years	12 of 100 (Routine)
19 March 1997	Caldwell, US	monthly high max	28.9 C (84.0 F)	1.1 C (2.0 F)	18 years	26 of 100 (Routine)
19 March 1997	Caldwell, US	daily high min (Tie)	8.9 C (48.0 F)	tie	7 years	2 of 100 (Routine)
18 March 1997	Caldwell, US	daily high max (Tie)	24.4 C (75.9 F)	tie	87 years	8 of 100 (Routine)
10 March 1997	Caldwell, US	daily high max	21.7 C (71.1 F)	0.6 C (1.1 F)	24 years	17 of 100 (Routine)
17 February 1997	Caldwell, US	daily high min	7.2 C (45.0 F)	1.6 C (2.9 F)	43 years	24 of 100 (Routine)
28 January 1997	Caldwell, US	daily rain	23.9 mm (0.9 in)	13.0 mm (0.5 in)	32 years	20 of 100 (Routine)
25 January 1997	Caldwell, US	daily rain	11.4 mm (0.4 in)	1.5 mm (0.06 in)	10 years	15 of 100 (Routine)
4 January 1997	Caldwell, US	daily rain	20.8 mm (0.8 in)	11.4 mm (0.4 in)	76 years	20 of 100 (Routine)
2 January 1997	Caldwell, US	daily high min	5.0 C (41.0 F)	3.3 C (5.9 F)	89 years	40 of 100 (Notable)
2 January 1997	Caldwell, US	daily high max	13.9 C (57.0 F)	0.6 C (1.1 F)	63 years	28 of 100 (Routine)
1 January 1997	Caldwell, US	daily high max	13.9 C (57.0 F)	1.7 C (3.1 F)	79 years	35 of 100 (Notable)
1 January 1997	Caldwell, US	daily high min	6.1 C (43.0 F)	2.2 C (4.0 F)	63 years	30 of 100 (Routine)
31 December 1996	Caldwell, US	daily high min	7.2 C (45.0 F)	4.4 C (7.9 F)	54 years	32 of 100 (Routine)
31 December 1996	Caldwell, US	daily high max	11.7 C (53.1 F)	1.1 C (2.0 F)	63 years	29 of 100 (Routine)

Climate Trend

88 complete years, 1905 to 1996

One stripe for each of 88 complete years at Caldwell, 1905 to 1996. Blue stripes are years cooler than the station's own mean of 10.6 C (51.1 F); red stripes are warmer. The coolest year was 1985, at 8.3 C (47.0 F), and the warmest was 1934, at 12.7 C (54.8 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Caldwell as warming stripes, 1905 to 1996
Year	Annual mean temperature	Difference from the station mean
1905	9.9 C	-0.66 C
1906	10.5 C	-0.14 C
1907	10.7 C	+0.12 C
1908	10.0 C	-0.60 C
1909	10.3 C	-0.33 C
1910	10.2 C	-0.40 C
1911	9.3 C	-1.32 C
1912	9.2 C	-1.36 C
1913	9.5 C	-1.14 C
1914	10.4 C	-0.20 C
1916	9.6 C	-1.01 C
1917	10.0 C	-0.55 C
1918	11.0 C	+0.41 C
1919	10.0 C	-0.57 C
1920	10.2 C	-0.43 C
1921	10.7 C	+0.15 C
1922	9.5 C	-1.11 C
1923	9.9 C	-0.66 C
1924	9.7 C	-0.88 C
1925	10.9 C	+0.32 C
1926	11.2 C	+0.56 C
1927	9.7 C	-0.94 C
1928	9.9 C	-0.72 C
1929	9.0 C	-1.56 C
1930	9.3 C	-1.32 C
1931	10.2 C	-0.35 C
1932	9.5 C	-1.09 C
1933	10.1 C	-0.53 C
1934	12.7 C	+2.06 C
1935	9.7 C	-0.88 C
1936	10.8 C	+0.24 C
1937	10.5 C	-0.06 C
1938	11.2 C	+0.64 C
1939	10.9 C	+0.33 C
1940	11.5 C	+0.91 C
1941	10.8 C	+0.20 C
1942	9.6 C	-1.03 C
1943	10.0 C	-0.56 C
1944	9.7 C	-0.87 C
1945	10.2 C	-0.35 C
1946	10.5 C	-0.09 C
1947	10.4 C	-0.18 C
1948	9.8 C	-0.84 C
1949	9.9 C	-0.68 C
1950	9.9 C	-0.74 C
1951	10.0 C	-0.56 C
1952	10.2 C	-0.41 C
1953	11.4 C	+0.78 C
1954	10.6 C	+0.04 C
1955	9.4 C	-1.18 C
1957	9.7 C	-0.85 C
1958	11.4 C	+0.84 C
1959	10.1 C	-0.47 C
1960	11.0 C	+0.40 C
1961	12.0 C	+1.40 C
1963	11.8 C	+1.16 C
1964	10.2 C	-0.38 C
1965	11.0 C	+0.38 C
1966	11.7 C	+1.10 C
1967	12.1 C	+1.53 C
1968	11.4 C	+0.80 C
1969	11.2 C	+0.62 C
1970	11.9 C	+1.28 C
1971	11.4 C	+0.84 C
1972	10.9 C	+0.27 C
1973	12.3 C	+1.69 C
1975	11.1 C	+0.54 C
1976	11.2 C	+0.58 C
1977	11.2 C	+0.58 C
1978	11.2 C	+0.56 C
1979	10.6 C	+0.05 C
1980	10.6 C	+0.04 C
1981	11.2 C	+0.64 C
1982	9.6 C	-0.99 C
1983	10.7 C	+0.09 C
1984	9.6 C	-1.02 C
1985	8.3 C	-2.28 C
1986	11.6 C	+0.98 C
1987	12.2 C	+1.61 C
1988	11.8 C	+1.20 C
1989	10.5 C	-0.11 C
1990	11.8 C	+1.19 C
1991	11.2 C	+0.58 C
1992	12.3 C	+1.70 C
1993	9.9 C	-0.67 C
1994	11.8 C	+1.20 C
1995	12.0 C	+1.36 C
1996	11.9 C	+1.28 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1905 to 1996. In Fahrenheit: 0.3 F (0.2 to 0.4) per decade. The slope is a straight line fitted to 88 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Caldwell
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.2) per decade	0.3 F (0.2 to 0.4) per decade	1905 to 1996	88	Rise
Mean daily maximum	0.07 C (0.00 to 0.15) per decade	0.13 F (-0.01 to 0.27) per decade	1905 to 1996	88	Not clearly different from zero
Mean daily minimum	0.2 C (0.2 to 0.3) per decade	0.4 F (0.3 to 0.6) per decade	1905 to 1996	88	Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1904 to 1997

Yearly extremes at Caldwell: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	44.4 C (111.9 F)	1961	39.4 C (102.9 F)	94
Coldest night (TNn)	-36.7 C (-34.1 F)	1924	-18.9 C (-2.0 F)	94
Wettest day (Rx1day)	63.5 mm (2.5 in)	1913	18.7 mm (0.7 in)	94
Wettest five days (Rx5day)	80.7 mm (3.2 in)	1913	31.6 mm (1.2 in)	94
Longest dry spell (CDD)	111 days	1919	54 days	94

Hottest day (TXx)

The hottest day of the year at Caldwell, 1904 to 1997. The record is 44.4 C (111.9 F) in 1961, marked on the chart; the median year is 39.4 C (102.9 F).

Hottest day (TXx) at Caldwell by year
Year	Hottest day (TXx)
1904	21.1 C (70.0 F)
1905	40.0 C (104.0 F)
1906	40.0 C (104.0 F)
1907	38.9 C (102.0 F)
1908	40.0 C (104.0 F)
1909	38.9 C (102.0 F)
1910	38.3 C (100.9 F)
1911	37.2 C (99.0 F)
1912	36.7 C (98.1 F)
1913	36.7 C (98.1 F)
1914	39.4 C (102.9 F)
1915	37.8 C (100.0 F)
1916	38.9 C (102.0 F)
1917	39.4 C (102.9 F)
1918	38.9 C (102.0 F)
1919	40.6 C (105.1 F)
1920	41.1 C (106.0 F)
1921	38.9 C (102.0 F)
1922	38.9 C (102.0 F)
1923	38.9 C (102.0 F)
1924	41.7 C (107.1 F)
1925	41.1 C (106.0 F)
1926	39.4 C (102.9 F)
1927	38.9 C (102.0 F)
1928	40.6 C (105.1 F)
1929	40.0 C (104.0 F)
1930	38.9 C (102.0 F)
1931	41.1 C (106.0 F)
1932	39.4 C (102.9 F)
1933	40.6 C (105.1 F)
1934	41.7 C (107.1 F)
1935	40.0 C (104.0 F)
1936	41.1 C (106.0 F)
1937	40.0 C (104.0 F)
1938	39.4 C (102.9 F)
1939	40.6 C (105.1 F)
1940	40.6 C (105.1 F)
1941	38.9 C (102.0 F)
1942	39.4 C (102.9 F)
1943	38.9 C (102.0 F)
1944	38.3 C (100.9 F)
1945	36.7 C (98.1 F)
1946	38.9 C (102.0 F)
1947	37.8 C (100.0 F)
1948	36.1 C (97.0 F)
1949	40.0 C (104.0 F)
1950	37.2 C (99.0 F)
1951	38.9 C (102.0 F)
1952	37.2 C (99.0 F)
1953	40.0 C (104.0 F)
1954	36.1 C (97.0 F)
1955	37.8 C (100.0 F)
1956	38.9 C (102.0 F)
1957	36.1 C (97.0 F)
1958	39.4 C (102.9 F)
1959	38.9 C (102.0 F)
1960	43.3 C (109.9 F)
1961	44.4 C (111.9 F)
1962	40.0 C (104.0 F)
1963	37.8 C (100.0 F)
1964	40.0 C (104.0 F)
1965	38.9 C (102.0 F)
1966	40.6 C (105.1 F)
1967	42.2 C (108.0 F)
1968	41.1 C (106.0 F)
1969	42.2 C (108.0 F)
1970	40.6 C (105.1 F)
1971	41.1 C (106.0 F)
1972	40.6 C (105.1 F)
1973	40.6 C (105.1 F)
1974	40.0 C (104.0 F)
1975	42.2 C (108.0 F)
1976	38.9 C (102.0 F)
1977	40.6 C (105.1 F)
1978	41.1 C (106.0 F)
1979	40.6 C (105.1 F)
1980	41.1 C (106.0 F)
1981	38.9 C (102.0 F)
1982	38.3 C (100.9 F)
1983	40.6 C (105.1 F)
1984	39.4 C (102.9 F)
1985	40.0 C (104.0 F)
1986	40.0 C (104.0 F)
1987	38.3 C (100.9 F)
1988	40.0 C (104.0 F)
1989	40.6 C (105.1 F)
1990	42.8 C (109.0 F)
1991	38.9 C (102.0 F)
1992	41.7 C (107.1 F)
1993	37.8 C (100.0 F)
1994	41.1 C (106.0 F)
1995	39.4 C (102.9 F)
1996	41.1 C (106.0 F)
1997	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Caldwell, 1904 to 1997. The record is -36.7 C (-34.1 F) in 1924, marked on the chart; the median year is -18.9 C (-2.0 F).

Coldest night (TNn) at Caldwell by year
Year	Coldest night (TNn)
1904	-11.7 C (10.9 F)
1905	-19.4 C (-2.9 F)
1906	-21.1 C (-6.0 F)
1907	-17.8 C (0.0 F)
1908	-14.4 C (6.1 F)
1909	-15.6 C (3.9 F)
1910	-29.4 C (-20.9 F)
1911	-18.9 C (-2.0 F)
1912	-30.6 C (-23.1 F)
1913	-18.3 C (-0.9 F)
1914	-20.6 C (-5.1 F)
1915	-21.1 C (-6.0 F)
1916	-21.7 C (-7.1 F)
1917	-22.8 C (-9.0 F)
1918	-19.4 C (-2.9 F)
1919	-26.1 C (-15.0 F)
1920	-16.7 C (1.9 F)
1921	-12.8 C (9.0 F)
1922	-30.0 C (-22.0 F)
1923	-19.4 C (-2.9 F)
1924	-36.7 C (-34.1 F)
1925	-16.1 C (3.0 F)
1926	-20.0 C (-4.0 F)
1927	-18.3 C (-0.9 F)
1928	-20.0 C (-4.0 F)
1929	-21.7 C (-7.1 F)
1930	-35.0 C (-31.0 F)
1931	-21.1 C (-6.0 F)
1932	-24.4 C (-11.9 F)
1933	-29.4 C (-20.9 F)
1934	-9.4 C (15.1 F)
1935	-22.2 C (-8.0 F)
1936	-18.9 C (-2.0 F)
1937	-31.7 C (-25.1 F)
1938	-11.7 C (10.9 F)
1939	-11.7 C (10.9 F)
1940	-15.6 C (3.9 F)
1941	-13.3 C (8.1 F)
1942	-23.9 C (-11.0 F)
1943	-21.7 C (-7.1 F)
1944	-18.9 C (-2.0 F)
1945	-18.3 C (-0.9 F)
1946	-12.2 C (10.0 F)
1947	-20.6 C (-5.1 F)
1948	-18.9 C (-2.0 F)
1949	-22.8 C (-9.0 F)
1950	-25.6 C (-14.1 F)
1951	-16.7 C (1.9 F)
1952	-18.9 C (-2.0 F)
1953	-11.1 C (12.0 F)
1954	-13.3 C (8.1 F)
1955	-20.0 C (-4.0 F)
1956	-21.1 C (-6.0 F)
1957	-30.0 C (-22.0 F)
1958	-13.3 C (8.1 F)
1959	-18.3 C (-0.9 F)
1960	-17.2 C (1.0 F)
1961	-15.6 C (3.9 F)
1962	-28.9 C (-20.0 F)
1963	-21.7 C (-7.1 F)
1964	-18.9 C (-2.0 F)
1965	-13.3 C (8.1 F)
1966	-16.7 C (1.9 F)
1967	-16.1 C (3.0 F)
1968	-15.6 C (3.9 F)
1969	-12.2 C (10.0 F)
1970	-13.3 C (8.1 F)
1971	-12.8 C (9.0 F)
1972	-25.6 C (-14.1 F)
1973	-11.1 C (12.0 F)
1974	-18.9 C (-2.0 F)
1975	-16.7 C (1.9 F)
1976	-13.3 C (8.1 F)
1977	-22.2 C (-8.0 F)
1978	-20.6 C (-5.1 F)
1979	-27.2 C (-17.0 F)
1980	-19.4 C (-2.9 F)
1981	-16.7 C (1.9 F)
1982	-22.8 C (-9.0 F)
1983	-23.9 C (-11.0 F)
1984	-25.0 C (-13.0 F)
1985	-26.1 C (-15.0 F)
1986	-18.9 C (-2.0 F)
1987	-15.6 C (3.9 F)
1988	-19.4 C (-2.9 F)
1989	-28.9 C (-20.0 F)
1990	-31.1 C (-24.0 F)
1991	-20.6 C (-5.1 F)
1992	-17.8 C (0.0 F)
1993	-20.0 C (-4.0 F)
1994	-14.4 C (6.1 F)
1995	-16.1 C (3.0 F)
1996	-16.7 C (1.9 F)
1997	-15.0 C (5.0 F)

Wettest day (Rx1day)

The wettest day of the year at Caldwell, 1904 to 1997. The record is 63.5 mm (2.5 in) in 1913, marked on the chart; the median year is 18.7 mm (0.7 in).

Wettest day (Rx1day) at Caldwell by year
Year	Wettest day (Rx1day)
1904	16.8 mm (0.7 in)
1905	16.3 mm (0.6 in)
1906	38.1 mm (1.5 in)
1907	12.7 mm (0.5 in)
1908	38.1 mm (1.5 in)
1909	18.0 mm (0.7 in)
1910	14.7 mm (0.6 in)
1911	15.7 mm (0.6 in)
1912	32.8 mm (1.3 in)
1913	63.5 mm (2.5 in)
1914	15.7 mm (0.6 in)
1915	14.2 mm (0.6 in)
1916	15.2 mm (0.6 in)
1917	18.8 mm (0.7 in)
1918	19.6 mm (0.8 in)
1919	21.6 mm (0.9 in)
1920	20.8 mm (0.8 in)
1921	26.7 mm (1.1 in)
1922	17.8 mm (0.7 in)
1923	18.5 mm (0.7 in)
1924	24.9 mm (1.0 in)
1925	31.8 mm (1.3 in)
1926	18.3 mm (0.7 in)
1927	12.2 mm (0.5 in)
1928	22.4 mm (0.9 in)
1929	14.0 mm (0.6 in)
1930	38.1 mm (1.5 in)
1931	11.7 mm (0.5 in)
1932	34.5 mm (1.4 in)
1933	12.4 mm (0.5 in)
1934	14.0 mm (0.6 in)
1935	22.9 mm (0.9 in)
1936	12.2 mm (0.5 in)
1937	24.1 mm (0.9 in)
1938	24.4 mm (1.0 in)
1939	20.6 mm (0.8 in)
1940	18.8 mm (0.7 in)
1941	14.0 mm (0.6 in)
1942	15.0 mm (0.6 in)
1943	20.8 mm (0.8 in)
1944	15.0 mm (0.6 in)
1945	21.3 mm (0.8 in)
1946	10.2 mm (0.4 in)
1947	10.7 mm (0.4 in)
1948	29.2 mm (1.1 in)
1949	11.7 mm (0.5 in)
1950	18.3 mm (0.7 in)
1951	20.8 mm (0.8 in)
1952	20.3 mm (0.8 in)
1953	26.7 mm (1.1 in)
1954	14.5 mm (0.6 in)
1955	22.6 mm (0.9 in)
1956	20.8 mm (0.8 in)
1957	22.9 mm (0.9 in)
1958	27.9 mm (1.1 in)
1959	36.3 mm (1.4 in)
1960	22.6 mm (0.9 in)
1961	14.2 mm (0.6 in)
1962	17.8 mm (0.7 in)
1963	17.3 mm (0.7 in)
1964	15.2 mm (0.6 in)
1965	19.8 mm (0.8 in)
1966	8.9 mm (0.35 in)
1967	26.2 mm (1.0 in)
1968	22.9 mm (0.9 in)
1969	21.8 mm (0.9 in)
1970	18.0 mm (0.7 in)
1971	14.2 mm (0.6 in)
1972	16.0 mm (0.6 in)
1973	21.8 mm (0.9 in)
1974	8.9 mm (0.35 in)
1975	15.2 mm (0.6 in)
1976	34.0 mm (1.3 in)
1977	15.7 mm (0.6 in)
1978	16.0 mm (0.6 in)
1979	25.9 mm (1.0 in)
1980	27.9 mm (1.1 in)
1981	22.9 mm (0.9 in)
1982	28.4 mm (1.1 in)
1983	13.7 mm (0.5 in)
1984	13.7 mm (0.5 in)
1985	16.8 mm (0.7 in)
1986	22.9 mm (0.9 in)
1987	22.9 mm (0.9 in)
1988	10.2 mm (0.4 in)
1989	18.3 mm (0.7 in)
1990	14.0 mm (0.6 in)
1991	25.7 mm (1.0 in)
1992	14.0 mm (0.6 in)
1993	27.4 mm (1.1 in)
1994	18.0 mm (0.7 in)
1995	16.8 mm (0.7 in)
1996	19.1 mm (0.8 in)
1997	23.9 mm (0.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Caldwell, 1904 to 1997. The record is 80.7 mm (3.2 in) in 1913, marked on the chart; the median year is 31.6 mm (1.2 in).

Wettest five days (Rx5day) at Caldwell by year
Year	Wettest five days (Rx5day)
1904	20.6 mm (0.8 in)
1905	25.7 mm (1.0 in)
1906	49.2 mm (1.9 in)
1907	31.4 mm (1.2 in)
1908	53.6 mm (2.1 in)
1909	29.5 mm (1.2 in)
1910	25.9 mm (1.0 in)
1911	32.5 mm (1.3 in)
1912	44.3 mm (1.7 in)
1913	80.7 mm (3.2 in)
1914	19.8 mm (0.8 in)
1915	35.9 mm (1.4 in)
1916	24.6 mm (1.0 in)
1917	23.9 mm (0.9 in)
1918	31.1 mm (1.2 in)
1919	30.3 mm (1.2 in)
1920	33.4 mm (1.3 in)
1921	50.1 mm (2.0 in)
1922	22.4 mm (0.9 in)
1923	50.6 mm (2.0 in)
1924	47.3 mm (1.9 in)
1925	48.6 mm (1.9 in)
1926	28.0 mm (1.1 in)
1927	29.7 mm (1.2 in)
1928	25.4 mm (1.0 in)
1929	23.2 mm (0.9 in)
1930	38.1 mm (1.5 in)
1931	23.9 mm (0.9 in)
1932	47.9 mm (1.9 in)
1933	33.3 mm (1.3 in)
1934	27.9 mm (1.1 in)
1935	47.8 mm (1.9 in)
1936	24.9 mm (1.0 in)
1937	41.9 mm (1.6 in)
1938	37.0 mm (1.5 in)
1939	25.2 mm (1.0 in)
1940	37.8 mm (1.5 in)
1941	26.5 mm (1.0 in)
1942	35.4 mm (1.4 in)
1943	38.8 mm (1.5 in)
1944	31.7 mm (1.2 in)
1945	38.3 mm (1.5 in)
1946	16.2 mm (0.6 in)
1947	18.1 mm (0.7 in)
1948	39.4 mm (1.6 in)
1949	15.8 mm (0.6 in)
1950	31.7 mm (1.2 in)
1951	43.4 mm (1.7 in)
1952	22.8 mm (0.9 in)
1953	48.3 mm (1.9 in)
1954	22.9 mm (0.9 in)
1955	47.3 mm (1.9 in)
1956	33.0 mm (1.3 in)
1957	34.3 mm (1.4 in)
1958	35.6 mm (1.4 in)
1959	60.7 mm (2.4 in)
1960	31.0 mm (1.2 in)
1961	20.3 mm (0.8 in)
1962	31.2 mm (1.2 in)
1963	30.0 mm (1.2 in)
1964	30.1 mm (1.2 in)
1965	30.8 mm (1.2 in)
1966	16.8 mm (0.7 in)
1967	28.2 mm (1.1 in)
1968	42.7 mm (1.7 in)
1969	47.1 mm (1.9 in)
1970	43.7 mm (1.7 in)
1971	38.0 mm (1.5 in)
1972	22.6 mm (0.9 in)
1973	31.9 mm (1.3 in)
1974	20.5 mm (0.8 in)
1975	24.6 mm (1.0 in)
1976	34.5 mm (1.4 in)
1977	31.3 mm (1.2 in)
1978	27.5 mm (1.1 in)
1979	49.7 mm (2.0 in)
1980	59.4 mm (2.3 in)
1981	31.3 mm (1.2 in)
1982	34.5 mm (1.4 in)
1983	29.0 mm (1.1 in)
1984	27.0 mm (1.1 in)
1985	28.2 mm (1.1 in)
1986	38.6 mm (1.5 in)
1987	28.7 mm (1.1 in)
1988	17.5 mm (0.7 in)
1989	30.0 mm (1.2 in)
1990	20.3 mm (0.8 in)
1991	37.6 mm (1.5 in)
1992	32.3 mm (1.3 in)
1993	50.3 mm (2.0 in)
1994	23.2 mm (0.9 in)
1995	36.8 mm (1.4 in)
1996	40.5 mm (1.6 in)
1997	68.5 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Caldwell, 1904 to 1997. The record is 111 days in 1919, marked on the chart; the median year is 54 days.

Longest dry spell (CDD) at Caldwell by year
Year	Longest dry spell (CDD)
1904	32 days
1905	39 days
1906	76 days
1907	41 days
1908	49 days
1909	73 days
1910	110 days
1911	47 days
1912	35 days
1913	48 days
1914	39 days
1915	71 days
1916	44 days
1917	101 days
1918	43 days
1919	111 days
1920	56 days
1921	77 days
1922	42 days
1923	43 days
1924	68 days
1925	44 days
1926	50 days
1927	29 days
1928	82 days
1929	68 days
1930	44 days
1931	84 days
1932	67 days
1933	69 days
1934	102 days
1935	104 days
1936	60 days
1937	54 days
1938	40 days
1939	69 days
1940	77 days
1941	31 days
1942	73 days
1943	94 days
1944	55 days
1945	53 days
1946	46 days
1947	69 days
1948	52 days
1949	63 days
1950	40 days
1951	49 days
1952	67 days
1953	51 days
1954	36 days
1955	54 days
1956	42 days
1957	102 days
1958	27 days
1959	43 days
1960	66 days
1961	50 days
1962	34 days
1963	28 days
1964	60 days
1965	54 days
1966	82 days
1967	81 days
1968	51 days
1969	83 days
1970	49 days
1971	89 days
1972	29 days
1973	48 days
1974	63 days
1975	42 days
1976	38 days
1977	38 days
1978	62 days
1979	40 days
1980	67 days
1981	80 days
1982	34 days
1983	39 days
1984	58 days
1985	39 days
1986	64 days
1987	78 days
1988	75 days
1989	56 days
1990	35 days
1991	72 days
1992	65 days
1993	59 days
1994	90 days
1995	46 days
1996	38 days
1997	44 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

88 years with a frost

Across 88 years with a frost, the median last spring frost at Caldwell falls on 5 May and the median first autumn frost on 28 September, which leaves a median of 147 days between them.

In 1966 to 1996 the median growing season was 164 days. That is 31 days more than in 1905 to 1935.

Fitted over all years, the growing season changes by +5.4 days per decade at this station.

Frost dates and growing season at Caldwell
Measure	Median, all years	Earliest period (1905 to 1935)	Recent period (1966 to 1996)	Recent against earliest	Fitted trend
Last spring frost	5 May	16 May	27 April	19 days earlier	-3.0 days per decade
First autumn frost	28 September	19 September	5 October	16 days later	+2.4 days per decade
Growing days	147 days	133 days	164 days	31 days more	+5.4 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

91 years, 1905 to 1996

A day with at least 18.6 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 49.2 mm (1.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Caldwell: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	18.6 mm (0.7 in)
5 years	25.4 mm (1.0 in)
10 years	30.5 mm (1.2 in)
25 years	37.4 mm (1.5 in)
50 years	43.1 mm (1.7 in)
100 years	49.2 mm (1.9 in)	Longer than the 91 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 91 years of values from 1905 to 1996.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 63.5 mm (2.5 in) in 1913; 38.1 mm (1.5 in) in 1906; 38.1 mm (1.5 in) in 1908.

Station Changes

2 suspected

2 changes were suspected in the annual mean temperature of Caldwell, at 1939 and 1960. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1939 ran 0.4 C (0.8 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1960 ran 0.6 C (1.0 F) higher than in the years before (likely change).

Suspected changes in the annual mean temperature at Caldwell, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1939	-0.4	-0.8	likely	5
1960	+0.6	+1.0	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

Data for Caldwell standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Caldwell threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).