Idaho Springs Weather Records (USC00054234)

Record envelope, standing records and threshold days for Idaho Springs (USC00054234), Colorado, United States, with 82 years of record.

Key Facts for Idaho Springs

Idaho Springs (USC00054234) is a weather station in Colorado, United States at 39.75 latitude and -105.52 longitude, 2,303 m (7,555 ft) above sea level.
The station reports from 1893 to 1974, 82 years of record.
1,464 records set at Idaho Springs still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Idaho Springs tied a daily record high minimum temperature of 12.8 C (55.0 F) on 28 June 1974.

About the Station

Location: Colorado, United States, 39.75 latitude, -105.52 longitude.
Elevation: 2,303 m (7,555 ft).
Period of record: 1893 to 1974, 82 years.
Eligible elements: tmax, tmin, prcp, snow.

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 Idaho Springs. 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 Idaho Springs, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-35.6 C (-32.1 F)	n/a	n/a
Feb	19.4 C (66.9 F)	-33.9 C (-29.0 F)	n/a	n/a
Mar	22.8 C (73.0 F)	-30.6 C (-23.1 F)	n/a	n/a
Apr	26.1 C (79.0 F)	-21.1 C (-6.0 F)	n/a	n/a
May	31.7 C (89.1 F)	-13.3 C (8.1 F)	n/a	n/a
Jun	35.0 C (95.0 F)	-5.0 C (23.0 F)	n/a	n/a
Jul	33.9 C (93.0 F)	-2.2 C (28.0 F)	n/a	n/a
Aug	32.8 C (91.0 F)	-2.2 C (28.0 F)	n/a	n/a
Sep	33.3 C (91.9 F)	-10.0 C (14.0 F)	n/a	n/a
Oct	28.3 C (82.9 F)	-19.4 C (-2.9 F)	n/a	n/a
Nov	21.7 C (71.1 F)	-29.4 C (-20.9 F)	n/a	n/a
Dec	18.9 C (66.0 F)	-31.1 C (-24.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Idaho Springs still stand. 1962 holds the most, with 64.

Standing records at Idaho Springs by the year they were set
Year set	Standing records
1893	9
1894	5
1905	16
1906	27
1907	25
1908	15
1909	22
1910	28
1911	18
1912	12
1913	25
1914	13
1915	22
1916	26
1917	29
1918	24
1919	21
1920	15
1921	22
1922	20
1923	22
1924	14
1925	11
1926	20
1927	30
1928	18
1929	22
1930	24
1931	25
1932	21
1933	31
1934	12
1935	19
1936	19
1937	26
1938	17
1939	19
1940	12
1941	9
1942	20
1943	23
1944	15
1945	21
1946	20
1947	23
1948	33
1949	12
1950	28
1951	34
1952	18
1953	20
1954	20
1955	14
1956	12
1957	18
1958	30
1959	33
1960	40
1961	21
1962	64
1963	22
1964	12
1965	22
1966	14
1967	7
1968	9
1969	21
1970	10
1971	7
1972	11
1973	10
1974	35

All-Time Record Progression

7 new records

7 all-time records were set at Idaho Springs between 23 June 1943 and 30 June 1972. Each dot is a new record.

When Idaho Springs set new all-time records
Date	Kind	Detail
1943-06-23	Record high maximum temperature	Record high maximum temperature 33.9 C (93.0 F)
1948-01-27	Record low minimum temperature	Record low minimum temperature -34.4 C (-29.9 F)
1954-06-23	Record high maximum temperature	Record high maximum temperature 34.4 C (93.9 F)
1962-01-10	Record low minimum temperature	Record low minimum temperature -35.0 C (-31.0 F)
1963-01-11	Record low maximum temperature	Record low maximum temperature -23.3 C (-9.9 F)
1963-01-12	Record low minimum temperature	Record low minimum temperature -35.6 C (-32.1 F)
1972-06-30	Record high maximum temperature	Record high maximum temperature 35.0 C (95.0 F)

Wettest Day of Each Month

Apr: 121.9 mm (4.8 in)

The wettest day on record for each calendar month at Idaho Springs. The most was 121.9 mm (4.8 in) on 15 April 1921.

Record daily precipitation for each month at Idaho Springs
Month	Record daily precipitation (mm)	Date
Jan	19.1 mm (0.8 in)	8 January 1962
Feb	31.2 mm (1.2 in)	17 February 1934
Mar	37.6 mm (1.5 in)	21 March 1944
Apr	121.9 mm (4.8 in)	15 April 1921
May	104.1 mm (4.1 in)	7 May 1969
Jun	77.2 mm (3.0 in)	4 June 1949
Jul	45.2 mm (1.8 in)	27 July 1946
Aug	52.8 mm (2.1 in)	3 August 1951
Sep	52.3 mm (2.1 in)	10 September 1933
Oct	48.3 mm (1.9 in)	18 October 1908
Nov	48.3 mm (1.9 in)	2 November 1946
Dec	31.8 mm (1.3 in)	4 December 1913

Period of Record Coverage

1893 to 1974

72 years of record at Idaho Springs, 1893 to 1974. 13 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1905, 1916, 1937, 1941, 1942, 1956 and others.

Days with data per year at Idaho Springs
Year	Days with data	Share of year	Complete
1893	252	69%	No
1894	75	21%	No
1905	327	90%	No
1906	360	99%	Yes
1907	363	99%	Yes
1908	366	100%	Yes
1909	365	100%	Yes
1910	362	99%	Yes
1911	332	91%	Yes
1912	350	96%	Yes
1913	360	99%	Yes
1914	362	99%	Yes
1915	350	96%	Yes
1916	325	89%	No
1917	355	97%	Yes
1918	364	100%	Yes
1919	362	99%	Yes
1920	365	100%	Yes
1921	361	99%	Yes
1922	364	100%	Yes
1923	353	97%	Yes
1924	366	100%	Yes
1925	364	100%	Yes
1926	364	100%	Yes
1927	359	98%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	363	99%	Yes
1931	364	100%	Yes
1932	366	100%	Yes
1933	354	97%	Yes
1934	359	98%	Yes
1935	353	97%	Yes
1936	349	95%	Yes
1937	315	86%	No
1938	361	99%	Yes
1939	354	97%	Yes
1940	362	99%	Yes
1941	199	55%	No
1942	298	82%	No
1943	362	99%	Yes
1944	365	100%	Yes
1945	363	99%	Yes
1946	363	99%	Yes
1947	365	100%	Yes
1948	365	100%	Yes
1949	363	99%	Yes
1950	362	99%	Yes
1951	365	100%	Yes
1952	365	100%	Yes
1953	360	99%	Yes
1954	363	99%	Yes
1955	363	99%	Yes
1956	264	72%	No
1957	363	99%	Yes
1958	329	90%	Yes
1959	364	100%	Yes
1960	361	99%	Yes
1961	364	100%	Yes
1962	344	94%	Yes
1963	355	97%	Yes
1964	365	100%	Yes
1965	358	98%	Yes
1966	352	96%	Yes
1967	353	97%	Yes
1968	192	52%	No
1969	359	98%	Yes
1970	356	98%	Yes
1971	273	75%	No
1972	208	57%	No
1973	216	59%	No
1974	181	50%	No

Latest Records

Latest records at Idaho Springs
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 June 1974	Idaho Springs, US	daily high min (Tie)	12.8 C (55.0 F)	tie	37 years	4 of 100 (Routine)
26 June 1974	Idaho Springs, US	daily high max	31.7 C (89.1 F)	0.6 C (1.1 F)	4 years	10 of 100 (Routine)
20 June 1974	Idaho Springs, US	daily high min (Tie)	11.7 C (53.1 F)	tie	60 years	6 of 100 (Routine)
20 June 1974	Idaho Springs, US	daily high max (Tie)	31.1 C (88.0 F)	tie	31 years	4 of 100 (Routine)
19 June 1974	Idaho Springs, US	daily high min	12.2 C (54.0 F)	1.6 C (2.9 F)	56 years	29 of 100 (Routine)
19 June 1974	Idaho Springs, US	daily high max (Tie)	31.1 C (88.0 F)	tie	33 years	4 of 100 (Routine)
16 June 1974	Idaho Springs, US	daily high min	14.4 C (57.9 F)	2.2 C (4.0 F)	28 years	23 of 100 (Routine)
15 June 1974	Idaho Springs, US	daily high min	11.7 C (53.1 F)	0.6 C (1.1 F)	56 years	26 of 100 (Routine)
8 June 1974	Idaho Springs, US	daily low max	6.1 C (43.0 F)	4.5 C (8.1 F)	36 years	28 of 100 (Routine)
29 May 1974	Idaho Springs, US	daily high max (Tie)	26.1 C (79.0 F)	tie	36 years	4 of 100 (Routine)
28 May 1974	Idaho Springs, US	daily high min	10.6 C (51.1 F)	1.7 C (3.1 F)	45 years	26 of 100 (Routine)
28 May 1974	Idaho Springs, US	daily high max	30.0 C (86.0 F)	3.3 C (5.9 F)	23 years	19 of 100 (Routine)
27 May 1974	Idaho Springs, US	daily high min	10.0 C (50.0 F)	1.1 C (2.0 F)	61 years	29 of 100 (Routine)
27 May 1974	Idaho Springs, US	daily high max	28.9 C (84.0 F)	0.6 C (1.1 F)	32 years	18 of 100 (Routine)
18 May 1974	Idaho Springs, US	daily high min	10.0 C (50.0 F)	2.8 C (5.0 F)	53 years	32 of 100 (Routine)
18 May 1974	Idaho Springs, US	daily high max	26.1 C (79.0 F)	0.5 C (0.9 F)	4 years	9 of 100 (Routine)
17 May 1974	Idaho Springs, US	daily high min (Tie)	8.9 C (48.0 F)	tie	52 years	5 of 100 (Routine)
9 May 1974	Idaho Springs, US	daily high min	7.8 C (46.0 F)	1.1 C (2.0 F)	35 years	21 of 100 (Routine)
8 May 1974	Idaho Springs, US	daily high max	26.1 C (79.0 F)	1.7 C (3.1 F)	57 years	28 of 100 (Routine)
25 April 1974	Idaho Springs, US	daily high min	8.3 C (46.9 F)	5.0 C (9.0 F)	55 years	36 of 100 (Notable)

Climate Trend

57 complete years, 1906 to 1970

One stripe for each of 57 complete years at Idaho Springs, 1906 to 1970. Blue stripes are years cooler than the station's own mean of 6.2 C (43.2 F); red stripes are warmer. The coolest year was 1923, at 4.5 C (40.0 F), and the warmest was 1910, at 8.0 C (46.4 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Idaho Springs as warming stripes, 1906 to 1970
Year	Annual mean temperature	Difference from the station mean
1906	7.0 C	+0.70 C
1907	7.3 C	+1.08 C
1908	6.8 C	+0.51 C
1909	6.5 C	+0.22 C
1910	8.0 C	+1.73 C
1912	5.9 C	-0.38 C
1913	6.0 C	-0.24 C
1914	7.1 C	+0.80 C
1915	6.2 C	-0.01 C
1917	6.1 C	-0.14 C
1918	6.8 C	+0.58 C
1919	7.2 C	+0.98 C
1920	6.1 C	-0.14 C
1921	7.0 C	+0.76 C
1922	5.2 C	-1.05 C
1923	4.5 C	-1.80 C
1924	5.0 C	-1.24 C
1925	5.7 C	-0.51 C
1926	5.5 C	-0.72 C
1927	5.5 C	-0.79 C
1928	5.5 C	-0.74 C
1929	4.7 C	-1.58 C
1930	5.4 C	-0.84 C
1931	6.1 C	-0.16 C
1932	5.4 C	-0.88 C
1933	6.5 C	+0.24 C
1934	7.3 C	+1.08 C
1935	5.8 C	-0.43 C
1936	5.9 C	-0.37 C
1938	7.3 C	+1.03 C
1939	7.6 C	+1.38 C
1940	7.2 C	+0.94 C
1943	7.3 C	+1.04 C
1944	5.9 C	-0.31 C
1945	5.9 C	-0.40 C
1946	6.7 C	+0.48 C
1947	5.6 C	-0.61 C
1948	5.1 C	-1.19 C
1949	6.0 C	-0.21 C
1950	6.5 C	+0.28 C
1951	4.9 C	-1.31 C
1952	6.3 C	+0.05 C
1953	6.9 C	+0.64 C
1954	7.9 C	+1.65 C
1955	6.1 C	-0.20 C
1957	6.6 C	+0.38 C
1959	6.4 C	+0.10 C
1960	5.8 C	-0.41 C
1961	5.7 C	-0.56 C
1962	6.3 C	+0.06 C
1963	7.5 C	+1.24 C
1964	5.6 C	-0.64 C
1965	6.1 C	-0.16 C
1966	6.7 C	+0.49 C
1967	6.1 C	-0.16 C
1969	6.2 C	-0.02 C
1970	5.9 C	-0.36 C

The fitted trend in annual mean temperature here over 1906 to 1970 is -0.02 C (-0.14 to 0.09) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.04 F (-0.25 to 0.16) per decade. The slope is a straight line fitted to 57 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Idaho Springs
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.02 C (-0.14 to 0.09) per decade	-0.04 F (-0.25 to 0.16) per decade	1906 to 1970	57	Not clearly different from zero
Mean daily maximum	0.3 C (0.1 to 0.4) per decade	0.5 F (0.1 to 0.8) per decade	1906 to 1970	57	Rise
Mean daily minimum	-0.3 C (-0.4 to -0.2) per decade	-0.5 F (-0.8 to -0.3) per decade	1906 to 1970	57	Fall

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

1893 to 1974

Yearly extremes at Idaho Springs: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.0 C (95.0 F)	1972	31.1 C (88.0 F)	72
Coldest night (TNn)	-35.6 C (-32.1 F)	1963	-24.4 C (-11.9 F)	72
Wettest day (Rx1day)	121.9 mm (4.8 in)	1921	31.8 mm (1.3 in)	72
Wettest five days (Rx5day)	168.3 mm (6.6 in)	1969	49.7 mm (2.0 in)	72
Longest dry spell (CDD)	65 days	1956	33 days	72

Hottest day (TXx)

The hottest day of the year at Idaho Springs, 1893 to 1974. The record is 35.0 C (95.0 F) in 1972, marked on the chart; the median year is 31.1 C (88.0 F).

Hottest day (TXx) at Idaho Springs by year
Year	Hottest day (TXx)
1893	29.4 C (84.9 F)
1894	17.2 C (63.0 F)
1905	31.7 C (89.1 F)
1906	30.0 C (86.0 F)
1907	28.9 C (84.0 F)
1908	29.4 C (84.9 F)
1909	30.0 C (86.0 F)
1910	32.2 C (90.0 F)
1911	33.3 C (91.9 F)
1912	29.4 C (84.9 F)
1913	30.6 C (87.1 F)
1914	30.0 C (86.0 F)
1915	31.1 C (88.0 F)
1916	33.3 C (91.9 F)
1917	30.0 C (86.0 F)
1918	31.1 C (88.0 F)
1919	32.2 C (90.0 F)
1920	31.1 C (88.0 F)
1921	29.4 C (84.9 F)
1922	30.6 C (87.1 F)
1923	28.9 C (84.0 F)
1924	31.1 C (88.0 F)
1925	28.9 C (84.0 F)
1926	29.4 C (84.9 F)
1927	31.1 C (88.0 F)
1928	30.0 C (86.0 F)
1929	30.0 C (86.0 F)
1930	29.4 C (84.9 F)
1931	32.8 C (91.0 F)
1932	29.4 C (84.9 F)
1933	30.0 C (86.0 F)
1934	32.2 C (90.0 F)
1935	30.0 C (86.0 F)
1936	32.2 C (90.0 F)
1937	30.6 C (87.1 F)
1938	32.2 C (90.0 F)
1939	32.8 C (91.0 F)
1940	32.2 C (90.0 F)
1941	30.6 C (87.1 F)
1942	32.2 C (90.0 F)
1943	33.9 C (93.0 F)
1944	32.2 C (90.0 F)
1945	30.0 C (86.0 F)
1946	31.1 C (88.0 F)
1947	31.7 C (89.1 F)
1948	32.2 C (90.0 F)
1949	30.0 C (86.0 F)
1950	31.1 C (88.0 F)
1951	31.1 C (88.0 F)
1952	31.1 C (88.0 F)
1953	31.1 C (88.0 F)
1954	34.4 C (93.9 F)
1955	31.1 C (88.0 F)
1956	30.0 C (86.0 F)
1957	33.3 C (91.9 F)
1958	33.3 C (91.9 F)
1959	32.8 C (91.0 F)
1960	33.9 C (93.0 F)
1961	31.1 C (88.0 F)
1962	32.8 C (91.0 F)
1963	32.8 C (91.0 F)
1964	31.1 C (88.0 F)
1965	29.4 C (84.9 F)
1966	31.7 C (89.1 F)
1967	29.4 C (84.9 F)
1968	30.0 C (86.0 F)
1969	31.1 C (88.0 F)
1970	31.1 C (88.0 F)
1971	32.2 C (90.0 F)
1972	35.0 C (95.0 F)
1973	29.4 C (84.9 F)
1974	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at Idaho Springs, 1893 to 1974. The record is -35.6 C (-32.1 F) in 1963, marked on the chart; the median year is -24.4 C (-11.9 F).

Coldest night (TNn) at Idaho Springs by year
Year	Coldest night (TNn)
1893	-20.0 C (-4.0 F)
1894	-24.4 C (-11.9 F)
1905	-24.4 C (-11.9 F)
1906	-20.6 C (-5.1 F)
1907	-16.7 C (1.9 F)
1908	-21.7 C (-7.1 F)
1909	-22.8 C (-9.0 F)
1910	-25.6 C (-14.1 F)
1911	-24.4 C (-11.9 F)
1912	-22.2 C (-8.0 F)
1913	-33.9 C (-29.0 F)
1914	-27.2 C (-17.0 F)
1915	-23.9 C (-11.0 F)
1916	-29.4 C (-20.9 F)
1917	-26.7 C (-16.1 F)
1918	-25.0 C (-13.0 F)
1919	-30.0 C (-22.0 F)
1920	-22.8 C (-9.0 F)
1921	-17.8 C (0.0 F)
1922	-24.4 C (-11.9 F)
1923	-29.4 C (-20.9 F)
1924	-31.1 C (-24.0 F)
1925	-18.9 C (-2.0 F)
1926	-26.7 C (-16.1 F)
1927	-26.1 C (-15.0 F)
1928	-24.4 C (-11.9 F)
1929	-29.4 C (-20.9 F)
1930	-32.2 C (-26.0 F)
1931	-22.8 C (-9.0 F)
1932	-28.9 C (-20.0 F)
1933	-33.9 C (-29.0 F)
1934	-16.7 C (1.9 F)
1935	-26.7 C (-16.1 F)
1936	-24.4 C (-11.9 F)
1937	-28.3 C (-18.9 F)
1938	-20.0 C (-4.0 F)
1939	-21.7 C (-7.1 F)
1940	-25.6 C (-14.1 F)
1941	-21.7 C (-7.1 F)
1942	-22.8 C (-9.0 F)
1943	-30.6 C (-23.1 F)
1944	-23.3 C (-9.9 F)
1945	-20.6 C (-5.1 F)
1946	-24.4 C (-11.9 F)
1947	-24.4 C (-11.9 F)
1948	-34.4 C (-29.9 F)
1949	-26.1 C (-15.0 F)
1950	-29.4 C (-20.9 F)
1951	-32.8 C (-27.0 F)
1952	-25.6 C (-14.1 F)
1953	-25.0 C (-13.0 F)
1954	-24.4 C (-11.9 F)
1955	-25.0 C (-13.0 F)
1956	-25.0 C (-13.0 F)
1957	-20.6 C (-5.1 F)
1958	-21.1 C (-6.0 F)
1959	-24.4 C (-11.9 F)
1960	-28.3 C (-18.9 F)
1961	-25.0 C (-13.0 F)
1962	-35.0 C (-31.0 F)
1963	-35.6 C (-32.1 F)
1964	-22.8 C (-9.0 F)
1965	-26.7 C (-16.1 F)
1966	-24.4 C (-11.9 F)
1967	-22.8 C (-9.0 F)
1968	-22.2 C (-8.0 F)
1969	-24.4 C (-11.9 F)
1970	-21.1 C (-6.0 F)
1971	-27.2 C (-17.0 F)
1972	-27.8 C (-18.0 F)
1973	-23.3 C (-9.9 F)
1974	-18.9 C (-2.0 F)

Wettest day (Rx1day)

The wettest day of the year at Idaho Springs, 1893 to 1974. The record is 121.9 mm (4.8 in) in 1921, marked on the chart; the median year is 31.8 mm (1.3 in).

Wettest day (Rx1day) at Idaho Springs by year
Year	Wettest day (Rx1day)
1893	9.7 mm (0.38 in)
1894	12.4 mm (0.5 in)
1905	45.0 mm (1.8 in)
1906	33.8 mm (1.3 in)
1907	24.4 mm (1.0 in)
1908	48.3 mm (1.9 in)
1909	24.1 mm (0.9 in)
1910	31.8 mm (1.3 in)
1911	22.4 mm (0.9 in)
1912	35.3 mm (1.4 in)
1913	32.8 mm (1.3 in)
1914	34.3 mm (1.4 in)
1915	16.0 mm (0.6 in)
1916	32.8 mm (1.3 in)
1917	27.4 mm (1.1 in)
1918	31.5 mm (1.2 in)
1919	19.1 mm (0.8 in)
1920	40.9 mm (1.6 in)
1921	121.9 mm (4.8 in)
1922	37.6 mm (1.5 in)
1923	49.5 mm (1.9 in)
1924	35.8 mm (1.4 in)
1925	27.9 mm (1.1 in)
1926	50.8 mm (2.0 in)
1927	21.3 mm (0.8 in)
1928	24.6 mm (1.0 in)
1929	26.7 mm (1.1 in)
1930	19.8 mm (0.8 in)
1931	21.6 mm (0.9 in)
1932	23.4 mm (0.9 in)
1933	52.3 mm (2.1 in)
1934	31.2 mm (1.2 in)
1935	40.1 mm (1.6 in)
1936	46.5 mm (1.8 in)
1937	25.9 mm (1.0 in)
1938	40.6 mm (1.6 in)
1939	10.7 mm (0.4 in)
1940	32.0 mm (1.3 in)
1941	29.2 mm (1.1 in)
1942	58.4 mm (2.3 in)
1943	23.9 mm (0.9 in)
1944	70.9 mm (2.8 in)
1945	31.8 mm (1.3 in)
1946	48.3 mm (1.9 in)
1947	29.0 mm (1.1 in)
1948	38.6 mm (1.5 in)
1949	77.2 mm (3.0 in)
1950	26.7 mm (1.1 in)
1951	52.8 mm (2.1 in)
1952	34.5 mm (1.4 in)
1953	25.4 mm (1.0 in)
1954	19.6 mm (0.8 in)
1955	22.9 mm (0.9 in)
1956	15.2 mm (0.6 in)
1957	71.4 mm (2.8 in)
1958	16.5 mm (0.6 in)
1959	25.1 mm (1.0 in)
1960	35.8 mm (1.4 in)
1961	34.0 mm (1.3 in)
1962	19.1 mm (0.8 in)
1963	51.6 mm (2.0 in)
1964	22.6 mm (0.9 in)
1965	33.0 mm (1.3 in)
1966	21.3 mm (0.8 in)
1967	33.0 mm (1.3 in)
1968	26.9 mm (1.1 in)
1969	104.1 mm (4.1 in)
1970	42.2 mm (1.7 in)
1971	30.5 mm (1.2 in)
1972	63.5 mm (2.5 in)
1973	57.2 mm (2.3 in)
1974	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Idaho Springs, 1893 to 1974. The record is 168.3 mm (6.6 in) in 1969, marked on the chart; the median year is 49.7 mm (2.0 in).

Wettest five days (Rx5day) at Idaho Springs by year
Year	Wettest five days (Rx5day)
1893	9.7 mm (0.38 in)
1894	12.7 mm (0.5 in)
1905	62.0 mm (2.4 in)
1906	51.6 mm (2.0 in)
1907	42.3 mm (1.7 in)
1908	67.3 mm (2.6 in)
1909	55.3 mm (2.2 in)
1910	76.5 mm (3.0 in)
1911	27.5 mm (1.1 in)
1912	59.8 mm (2.4 in)
1913	47.2 mm (1.9 in)
1914	53.4 mm (2.1 in)
1915	36.1 mm (1.4 in)
1916	58.0 mm (2.3 in)
1917	54.8 mm (2.2 in)
1918	79.2 mm (3.1 in)
1919	41.5 mm (1.6 in)
1920	58.9 mm (2.3 in)
1921	135.0 mm (5.3 in)
1922	62.3 mm (2.5 in)
1923	68.8 mm (2.7 in)
1924	35.8 mm (1.4 in)
1925	46.9 mm (1.8 in)
1926	64.8 mm (2.6 in)
1927	40.8 mm (1.6 in)
1928	39.6 mm (1.6 in)
1929	63.5 mm (2.5 in)
1930	37.9 mm (1.5 in)
1931	26.3 mm (1.0 in)
1932	33.1 mm (1.3 in)
1933	93.8 mm (3.7 in)
1934	69.8 mm (2.7 in)
1935	43.2 mm (1.7 in)
1936	54.2 mm (2.1 in)
1937	45.8 mm (1.8 in)
1938	58.4 mm (2.3 in)
1939	16.1 mm (0.6 in)
1940	48.5 mm (1.9 in)
1941	22.1 mm (0.9 in)
1942	70.8 mm (2.8 in)
1943	37.7 mm (1.5 in)
1944	116.9 mm (4.6 in)
1945	50.9 mm (2.0 in)
1946	81.9 mm (3.2 in)
1947	70.9 mm (2.8 in)
1948	38.6 mm (1.5 in)
1949	115.8 mm (4.6 in)
1950	38.1 mm (1.5 in)
1951	75.3 mm (3.0 in)
1952	38.6 mm (1.5 in)
1953	36.9 mm (1.5 in)
1954	25.6 mm (1.0 in)
1955	40.6 mm (1.6 in)
1956	36.6 mm (1.4 in)
1957	101.9 mm (4.0 in)
1958	19.3 mm (0.8 in)
1959	48.0 mm (1.9 in)
1960	36.6 mm (1.4 in)
1961	60.7 mm (2.4 in)
1962	24.9 mm (1.0 in)
1963	70.8 mm (2.8 in)
1964	39.3 mm (1.5 in)
1965	64.5 mm (2.5 in)
1966	40.7 mm (1.6 in)
1967	47.3 mm (1.9 in)
1968	33.5 mm (1.3 in)
1969	168.3 mm (6.6 in)
1970	54.9 mm (2.2 in)
1971	55.1 mm (2.2 in)
1972	88.9 mm (3.5 in)
1973	64.8 mm (2.6 in)
1974	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Idaho Springs, 1893 to 1974. The record is 65 days in 1956, marked on the chart; the median year is 33 days.

Longest dry spell (CDD) at Idaho Springs by year
Year	Longest dry spell (CDD)
1893	39 days
1894	28 days
1905	28 days
1906	39 days
1907	27 days
1908	28 days
1909	34 days
1910	28 days
1911	15 days
1912	19 days
1913	34 days
1914	30 days
1915	35 days
1916	18 days
1917	35 days
1918	24 days
1919	24 days
1920	35 days
1921	4 days
1922	15 days
1923	26 days
1924	28 days
1925	30 days
1926	27 days
1927	41 days
1928	32 days
1929	18 days
1930	32 days
1931	39 days
1932	26 days
1933	38 days
1934	35 days
1935	57 days
1936	46 days
1937	29 days
1938	16 days
1939	57 days
1940	40 days
1941	44 days
1942	32 days
1943	41 days
1944	43 days
1945	27 days
1946	37 days
1947	39 days
1948	24 days
1949	41 days
1950	37 days
1951	28 days
1952	35 days
1953	41 days
1954	36 days
1955	33 days
1956	65 days
1957	24 days
1958	26 days
1959	29 days
1960	27 days
1961	28 days
1962	28 days
1963	34 days
1964	48 days
1965	38 days
1966	28 days
1967	24 days
1968	50 days
1969	51 days
1970	34 days
1971	31 days
1972	38 days
1973	35 days
1974	61 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

57 years with a frost

Across 57 years with a frost, the median last spring frost at Idaho Springs falls on 2 June and the median first autumn frost on 19 September, which leaves a median of 107 days between them.

Fitted over all years, the growing season changes by -3.5 days per decade at this station.

Frost dates and growing season at Idaho Springs
Measure	Median, all years	Earliest period	Recent period (1935 to 1970)	Recent against earliest	Fitted trend
Last spring frost	2 June	n/a	6 June	n/a	+2.3 days per decade
First autumn frost	19 September	n/a	15 September	n/a	-1.2 days per decade
Growing days	107 days	n/a	95 days	n/a	-3.5 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

58 years, 1905 to 1970

A day with at least 30.6 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 99.0 mm (3.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Idaho Springs: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	30.6 mm (1.2 in)
5 years	44.0 mm (1.7 in)
10 years	54.6 mm (2.1 in)
25 years	70.2 mm (2.8 in)
50 years	83.8 mm (3.3 in)
100 years	99.0 mm (3.9 in)	Longer than the 58 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, 58 years of values from 1905 to 1970.

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: 104.1 mm (4.1 in) in 1969; 77.2 mm (3.0 in) in 1949; 71.4 mm (2.8 in) in 1957.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Idaho Springs standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Idaho Springs 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).