Delaware 3 WSW Weather Records (USC00132136)

Record envelope, standing records and threshold days for Delaware 3 WSW (USC00132136), Iowa, United States, with 83 years of record.

Key Facts for Delaware 3 WSW

Delaware 3 WSW (USC00132136) is a weather station in Iowa, United States at 42.47 latitude and -91.42 longitude, 299 m (981 ft) above sea level.
The station reports from 1893 to 1975, 83 years of record.
1,464 records set at Delaware 3 WSW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Delaware 3 WSW set a daily record high maximum temperature of 14.4 C (57.9 F) on 14 December 1975.

About the Station

Location: Iowa, United States, 42.47 latitude, -91.42 longitude.
Elevation: 299 m (981 ft).
Period of record: 1893 to 1975, 83 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 Delaware 3 WSW. 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 Delaware 3 WSW, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	15.0 C (59.0 F)	-34.4 C (-29.9 F)	n/a	n/a
Feb	19.4 C (66.9 F)	-35.0 C (-31.0 F)	n/a	n/a
Mar	27.2 C (81.0 F)	-35.6 C (-32.1 F)	n/a	n/a
Apr	32.8 C (91.0 F)	-16.1 C (3.0 F)	n/a	n/a
May	41.7 C (107.1 F)	-5.6 C (21.9 F)	n/a	n/a
Jun	41.1 C (106.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	43.9 C (111.0 F)	4.4 C (39.9 F)	n/a	n/a
Aug	41.1 C (106.0 F)	1.7 C (35.1 F)	n/a	n/a
Sep	37.8 C (100.0 F)	-8.9 C (16.0 F)	n/a	n/a
Oct	32.8 C (91.0 F)	-11.7 C (10.9 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-23.3 C (-9.9 F)	n/a	n/a
Dec	17.2 C (63.0 F)	-33.3 C (-27.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Delaware 3 WSW still stand. 1936 holds the most, with 59.

Standing records at Delaware 3 WSW by the year they were set
Year set	Standing records
1899	29
1900	17
1901	31
1902	27
1903	18
1904	17
1905	20
1906	9
1907	16
1908	6
1909	35
1910	27
1911	30
1912	23
1913	18
1914	16
1915	33
1916	16
1917	21
1918	21
1919	9
1920	8
1921	26
1930	12
1931	41
1932	23
1933	31
1934	36
1935	19
1936	59
1937	19
1938	20
1939	24
1940	18
1941	19
1942	26
1943	20
1944	15
1945	24
1946	23
1947	27
1948	16
1949	19
1950	26
1951	23
1952	14
1953	18
1954	18
1955	17
1956	11
1957	7
1958	15
1959	23
1960	14
1961	12
1962	39
1963	30
1964	28
1965	31
1966	18
1967	22
1968	13
1969	14
1970	12
1971	11
1972	17
1973	24
1974	19
1975	24

All-Time Record Progression

8 new records

8 all-time records were set at Delaware 3 WSW between 15 February 1936 and 1 March 1962. Each dot is a new record.

When Delaware 3 WSW set new all-time records
Date	Kind	Detail
1936-02-15	Record snow depth	Record snow depth 66.0 cm (26.0 in)
1936-02-20	Record snow depth	Record snow depth 68.6 cm (27.0 in)
1941-09-08	Record daily precipitation	Record daily precipitation 158.5 mm (6.2 in)
1947-01-29	Record daily snowfall	Record daily snowfall 20.3 cm (8.0 in)
1949-01-28	Record daily snowfall	Record daily snowfall 22.9 cm (9.0 in)
1951-07-08	Record daily precipitation	Record daily precipitation 161.0 mm (6.3 in)
1961-03-08	Record daily snowfall	Record daily snowfall 35.6 cm (14.0 in)
1962-03-01	Record low minimum temperature	Record low minimum temperature -35.6 C (-32.1 F)

Wettest Day of Each Month

Jul: 161.0 mm (6.3 in)

The wettest day on record for each calendar month at Delaware 3 WSW. The most was 161.0 mm (6.3 in) on 8 July 1951.

Record daily precipitation for each month at Delaware 3 WSW
Month	Record daily precipitation (mm)	Date
Jan	63.8 mm (2.5 in)	12 January 1960
Feb	29.5 mm (1.2 in)	28 February 1948
Mar	49.3 mm (1.9 in)	8 March 1961
Apr	71.6 mm (2.8 in)	17 April 1900
May	111.0 mm (4.4 in)	28 May 1956
Jun	129.8 mm (5.1 in)	23 June 1940
Jul	161.0 mm (6.3 in)	8 July 1951
Aug	76.5 mm (3.0 in)	2 August 1972
Sep	158.5 mm (6.2 in)	8 September 1941
Oct	82.3 mm (3.2 in)	4 October 1919
Nov	60.5 mm (2.4 in)	25 November 1948
Dec	43.9 mm (1.7 in)	15 December 1971

Period of Record Coverage

1899 to 1975

69 years of record at Delaware 3 WSW, 1899 to 1975. 7 years have data for under 90 percent of days and are left out of rankings: 1908, 1913, 1914, 1920, 1921, 1930, 1960.

Days with data per year at Delaware 3 WSW
Year	Days with data	Share of year	Complete
1899	334	92%	Yes
1900	363	99%	Yes
1901	361	99%	Yes
1902	365	100%	Yes
1903	364	100%	Yes
1904	365	100%	Yes
1905	365	100%	Yes
1906	365	100%	Yes
1907	365	100%	Yes
1908	305	83%	No
1909	362	99%	Yes
1910	365	100%	Yes
1911	364	100%	Yes
1912	358	98%	Yes
1913	304	83%	No
1914	324	89%	No
1915	365	100%	Yes
1916	366	100%	Yes
1917	365	100%	Yes
1918	365	100%	Yes
1919	333	91%	Yes
1920	291	80%	No
1921	212	58%	No
1930	80	22%	No
1931	364	100%	Yes
1932	366	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	363	99%	Yes
1938	360	99%	Yes
1939	365	100%	Yes
1940	364	99%	Yes
1941	365	100%	Yes
1942	363	99%	Yes
1943	364	100%	Yes
1944	366	100%	Yes
1945	364	100%	Yes
1946	364	100%	Yes
1947	362	99%	Yes
1948	364	99%	Yes
1949	352	96%	Yes
1950	364	100%	Yes
1951	365	100%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	364	100%	Yes
1955	364	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	328	90%	No
1961	346	95%	Yes
1962	361	99%	Yes
1963	363	99%	Yes
1964	362	99%	Yes
1965	364	100%	Yes
1966	365	100%	Yes
1967	351	96%	Yes
1968	365	100%	Yes
1969	362	99%	Yes
1970	352	96%	Yes
1971	351	96%	Yes
1972	360	98%	Yes
1973	364	100%	Yes
1974	365	100%	Yes
1975	364	100%	Yes

Latest Records

Latest records at Delaware 3 WSW
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
14 December 1975	Delaware 3 WSW, US	daily high max	14.4 C (57.9 F)	6.6 C (11.9 F)	62 years	35 of 100 (Notable)
14 December 1975	Delaware 3 WSW, US	daily rain	10.2 mm (0.4 in)	3.8 mm (0.15 in)	54 years	20 of 100 (Routine)
14 December 1975	Delaware 3 WSW, US	daily high min	3.9 C (39.0 F)	3.9 C (7.0 F)	0 years	12 of 100 (Routine)
6 December 1975	Delaware 3 WSW, US	daily high max	15.6 C (60.1 F)	0.6 C (1.1 F)	24 years	14 of 100 (Routine)
30 November 1975	Delaware 3 WSW, US	daily rain	51.8 mm (2.0 in)	41.6 mm (1.6 in)	0 years	46 of 100 (Notable)
19 November 1975	Delaware 3 WSW, US	daily high min	8.9 C (48.0 F)	1.7 C (3.1 F)	44 years	22 of 100 (Routine)
7 November 1975	Delaware 3 WSW, US	daily high min	12.2 C (54.0 F)	0.5 C (0.9 F)	56 years	24 of 100 (Routine)
6 November 1975	Delaware 3 WSW, US	daily high min	11.7 C (53.1 F)	1.7 C (3.1 F)	58 years	26 of 100 (Routine)
4 November 1975	Delaware 3 WSW, US	daily high min (Tie)	11.1 C (52.0 F)	tie	36 years	4 of 100 (Routine)
14 October 1975	Delaware 3 WSW, US	daily high max (Tie)	31.1 C (88.0 F)	tie	28 years	3 of 100 (Routine)
26 September 1975	Delaware 3 WSW, US	daily low min	-1.7 C (28.9 F)	0.6 C (1.1 F)	62 years	26 of 100 (Routine)
22 September 1975	Delaware 3 WSW, US	daily low max (Tie)	11.1 C (52.0 F)	tie	61 years	6 of 100 (Routine)
13 September 1975	Delaware 3 WSW, US	daily low min (Tie)	0.6 C (33.1 F)	tie	72 years	7 of 100 (Routine)
24 August 1975	Delaware 3 WSW, US	daily high min	22.8 C (73.0 F)	0.6 C (1.1 F)	64 years	27 of 100 (Routine)
22 August 1975	Delaware 3 WSW, US	daily rain	34.5 mm (1.4 in)	9.4 mm (0.37 in)	0 years	14 of 100 (Routine)
7 August 1975	Delaware 3 WSW, US	daily low min	7.2 C (45.0 F)	1.1 C (2.0 F)	72 years	30 of 100 (Routine)
19 July 1975	Delaware 3 WSW, US	daily high min	23.3 C (73.9 F)	2.2 C (4.0 F)	22 years	19 of 100 (Routine)
14 July 1975	Delaware 3 WSW, US	daily low min	6.7 C (44.1 F)	0.5 C (0.9 F)	24 years	15 of 100 (Routine)
13 July 1975	Delaware 3 WSW, US	daily low max	18.9 C (66.0 F)	1.1 C (2.0 F)	24 years	16 of 100 (Routine)
12 July 1975	Delaware 3 WSW, US	daily low min	7.8 C (46.0 F)	0.5 C (0.9 F)	60 years	26 of 100 (Routine)

Climate Trend

58 complete years, 1900 to 1975

One stripe for each of 58 complete years at Delaware 3 WSW, 1900 to 1975. Blue stripes are years cooler than the station's own mean of 8.0 C (46.3 F); red stripes are warmer. The coolest year was 1917, at 6.0 C (42.8 F), and the warmest was 1931, at 11.0 C (51.7 F). The strongest colour marks a difference of 3.0 C (5.4 F).

Annual mean temperature at Delaware 3 WSW as warming stripes, 1900 to 1975
Year	Annual mean temperature	Difference from the station mean
1900	8.5 C	+0.49 C
1901	8.1 C	+0.11 C
1902	7.5 C	-0.43 C
1903	7.3 C	-0.70 C
1904	6.7 C	-1.24 C
1905	7.3 C	-0.71 C
1906	8.1 C	+0.11 C
1907	7.4 C	-0.53 C
1909	7.5 C	-0.48 C
1910	8.5 C	+0.50 C
1911	8.6 C	+0.63 C
1912	7.2 C	-0.77 C
1915	7.9 C	-0.12 C
1916	7.7 C	-0.25 C
1917	6.0 C	-1.98 C
1918	8.3 C	+0.37 C
1931	11.0 C	+2.99 C
1932	8.1 C	+0.15 C
1933	9.0 C	+0.98 C
1934	9.3 C	+1.29 C
1935	8.0 C	+0.00 C
1936	7.8 C	-0.21 C
1937	7.5 C	-0.44 C
1938	9.5 C	+1.50 C
1939	9.4 C	+1.46 C
1940	7.6 C	-0.33 C
1941	9.5 C	+1.49 C
1942	8.3 C	+0.31 C
1943	7.6 C	-0.38 C
1944	8.7 C	+0.74 C
1945	7.7 C	-0.32 C
1946	9.4 C	+1.45 C
1947	8.1 C	+0.16 C
1948	8.1 C	+0.12 C
1949	8.5 C	+0.48 C
1950	6.7 C	-1.30 C
1951	6.5 C	-1.48 C
1952	8.9 C	+0.91 C
1953	9.0 C	+1.07 C
1954	9.1 C	+1.13 C
1955	8.7 C	+0.68 C
1956	8.5 C	+0.54 C
1957	8.3 C	+0.32 C
1958	7.8 C	-0.21 C
1959	7.7 C	-0.30 C
1962	6.4 C	-1.54 C
1963	7.4 C	-0.58 C
1964	8.2 C	+0.19 C
1965	7.3 C	-0.64 C
1966	7.0 C	-0.97 C
1968	8.0 C	+0.00 C
1969	7.0 C	-0.97 C
1970	7.3 C	-0.67 C
1971	7.4 C	-0.53 C
1972	6.3 C	-1.64 C
1973	8.5 C	+0.53 C
1974	7.3 C	-0.64 C
1975	7.5 C	-0.51 C

The fitted trend in annual mean temperature here over 1900 to 1975 is -0.02 C (-0.13 to 0.08) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.04 F (-0.24 to 0.15) per decade. The slope is a straight line fitted to 58 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Delaware 3 WSW
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.02 C (-0.13 to 0.08) per decade	-0.04 F (-0.24 to 0.15) per decade	1900 to 1975	58	Not clearly different from zero
Mean daily maximum	0.00 C (-0.11 to 0.12) per decade	0.01 F (-0.20 to 0.21) per decade	1900 to 1975	58	Not clearly different from zero
Mean daily minimum	-0.1 C (-0.2 to 0.1) per decade	-0.1 F (-0.3 to 0.1) per decade	1900 to 1975	58	Not clearly different from zero

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 1975

Yearly extremes at Delaware 3 WSW: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.9 C (111.0 F)	1931	35.0 C (95.0 F)	69
Coldest night (TNn)	-35.6 C (-32.1 F)	1962	-29.4 C (-20.9 F)	69
Wettest day (Rx1day)	161.0 mm (6.3 in)	1951	51.8 mm (2.0 in)	75
Wettest five days (Rx5day)	182.7 mm (7.2 in)	1961	74.4 mm (2.9 in)	75
Longest dry spell (CDD)	56 days	1952	22 days	75

Hottest day (TXx)

The hottest day of the year at Delaware 3 WSW, 1893 to 1975. The record is 43.9 C (111.0 F) in 1931, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Delaware 3 WSW by year
Year	Hottest day (TXx)
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	35.0 C (95.0 F)
1900	33.9 C (93.0 F)
1901	42.2 C (108.0 F)
1902	32.2 C (90.0 F)
1903	32.2 C (90.0 F)
1904	33.3 C (91.9 F)
1905	35.0 C (95.0 F)
1906	32.8 C (91.0 F)
1907	34.4 C (93.9 F)
1908	34.4 C (93.9 F)
1909	34.4 C (93.9 F)
1910	36.7 C (98.1 F)
1911	39.4 C (102.9 F)
1912	35.0 C (95.0 F)
1913	37.8 C (100.0 F)
1914	36.1 C (97.0 F)
1915	30.0 C (86.0 F)
1916	37.2 C (99.0 F)
1917	35.0 C (95.0 F)
1918	37.2 C (99.0 F)
1919	35.6 C (96.1 F)
1920	33.3 C (91.9 F)
1921	36.1 C (97.0 F)
1930	22.2 C (72.0 F)
1931	43.9 C (111.0 F)
1932	36.1 C (97.0 F)
1933	37.2 C (99.0 F)
1934	41.7 C (107.1 F)
1935	37.2 C (99.0 F)
1936	41.7 C (107.1 F)
1937	38.3 C (100.9 F)
1938	34.4 C (93.9 F)
1939	37.2 C (99.0 F)
1940	37.8 C (100.0 F)
1941	38.3 C (100.9 F)
1942	33.9 C (93.0 F)
1943	34.4 C (93.9 F)
1944	35.0 C (95.0 F)
1945	35.6 C (96.1 F)
1946	33.9 C (93.0 F)
1947	39.4 C (102.9 F)
1948	37.2 C (99.0 F)
1949	35.6 C (96.1 F)
1950	32.2 C (90.0 F)
1951	32.8 C (91.0 F)
1952	35.0 C (95.0 F)
1953	36.1 C (97.0 F)
1954	35.6 C (96.1 F)
1955	37.2 C (99.0 F)
1956	36.7 C (98.1 F)
1957	34.4 C (93.9 F)
1958	35.0 C (95.0 F)
1959	34.4 C (93.9 F)
1960	35.0 C (95.0 F)
1961	35.0 C (95.0 F)
1962	33.3 C (91.9 F)
1963	37.8 C (100.0 F)
1964	35.6 C (96.1 F)
1965	35.6 C (96.1 F)
1966	35.6 C (96.1 F)
1967	32.8 C (91.0 F)
1968	34.4 C (93.9 F)
1969	32.8 C (91.0 F)
1970	35.0 C (95.0 F)
1971	35.6 C (96.1 F)
1972	33.9 C (93.0 F)
1973	34.4 C (93.9 F)
1974	35.0 C (95.0 F)
1975	33.3 C (91.9 F)

Coldest night (TNn)

The coldest night of the year at Delaware 3 WSW, 1893 to 1975. The record is -35.6 C (-32.1 F) in 1962, marked on the chart; the median year is -29.4 C (-20.9 F).

Coldest night (TNn) at Delaware 3 WSW by year
Year	Coldest night (TNn)
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	-33.3 C (-27.9 F)
1900	-26.1 C (-15.0 F)
1901	-29.4 C (-20.9 F)
1902	-30.0 C (-22.0 F)
1903	-29.4 C (-20.9 F)
1904	-31.7 C (-25.1 F)
1905	-35.0 C (-31.0 F)
1906	-23.3 C (-9.9 F)
1907	-25.0 C (-13.0 F)
1908	-23.9 C (-11.0 F)
1909	-30.0 C (-22.0 F)
1910	-30.6 C (-23.1 F)
1911	-27.8 C (-18.0 F)
1912	-33.3 C (-27.9 F)
1913	-25.6 C (-14.1 F)
1914	-30.6 C (-23.1 F)
1915	-31.7 C (-25.1 F)
1916	-32.2 C (-26.0 F)
1917	-31.7 C (-25.1 F)
1918	-32.2 C (-26.0 F)
1919	-33.3 C (-27.9 F)
1920	-25.6 C (-14.1 F)
1921	-21.1 C (-6.0 F)
1930	-23.3 C (-9.9 F)
1931	-22.2 C (-8.0 F)
1932	-28.9 C (-20.0 F)
1933	-33.9 C (-29.0 F)
1934	-25.0 C (-13.0 F)
1935	-29.4 C (-20.9 F)
1936	-33.9 C (-29.0 F)
1937	-24.4 C (-11.9 F)
1938	-23.9 C (-11.0 F)
1939	-24.4 C (-11.9 F)
1940	-30.6 C (-23.1 F)
1941	-26.1 C (-15.0 F)
1942	-33.3 C (-27.9 F)
1943	-30.0 C (-22.0 F)
1944	-28.3 C (-18.9 F)
1945	-28.3 C (-18.9 F)
1946	-27.2 C (-17.0 F)
1947	-30.0 C (-22.0 F)
1948	-27.2 C (-17.0 F)
1949	-28.9 C (-20.0 F)
1950	-31.7 C (-25.1 F)
1951	-31.1 C (-24.0 F)
1952	-26.7 C (-16.1 F)
1953	-27.8 C (-18.0 F)
1954	-27.8 C (-18.0 F)
1955	-27.8 C (-18.0 F)
1956	-30.6 C (-23.1 F)
1957	-28.3 C (-18.9 F)
1958	-28.9 C (-20.0 F)
1959	-28.9 C (-20.0 F)
1960	-30.6 C (-23.1 F)
1961	-31.1 C (-24.0 F)
1962	-35.6 C (-32.1 F)
1963	-33.3 C (-27.9 F)
1964	-23.9 C (-11.0 F)
1965	-33.3 C (-27.9 F)
1966	-31.7 C (-25.1 F)
1967	-34.4 C (-29.9 F)
1968	-27.8 C (-18.0 F)
1969	-26.7 C (-16.1 F)
1970	-34.4 C (-29.9 F)
1971	-33.3 C (-27.9 F)
1972	-30.0 C (-22.0 F)
1973	-29.4 C (-20.9 F)
1974	-32.8 C (-27.0 F)
1975	-27.2 C (-17.0 F)

Wettest day (Rx1day)

The wettest day of the year at Delaware 3 WSW, 1893 to 1975. The record is 161.0 mm (6.3 in) in 1951, marked on the chart; the median year is 51.8 mm (2.0 in).

Wettest day (Rx1day) at Delaware 3 WSW by year
Year	Wettest day (Rx1day)
1893	35.6 mm (1.4 in)
1894	30.5 mm (1.2 in)
1895	38.1 mm (1.5 in)
1896	91.9 mm (3.6 in)
1897	36.6 mm (1.4 in)
1898	45.2 mm (1.8 in)
1899	47.0 mm (1.9 in)
1900	71.6 mm (2.8 in)
1901	27.9 mm (1.1 in)
1902	34.5 mm (1.4 in)
1903	130.0 mm (5.1 in)
1904	31.2 mm (1.2 in)
1905	41.4 mm (1.6 in)
1906	23.9 mm (0.9 in)
1907	46.0 mm (1.8 in)
1908	51.8 mm (2.0 in)
1909	66.5 mm (2.6 in)
1910	40.6 mm (1.6 in)
1911	49.3 mm (1.9 in)
1912	29.2 mm (1.1 in)
1913	36.3 mm (1.4 in)
1914	76.2 mm (3.0 in)
1915	83.8 mm (3.3 in)
1916	44.2 mm (1.7 in)
1917	34.8 mm (1.4 in)
1918	35.6 mm (1.4 in)
1919	82.3 mm (3.2 in)
1920	42.9 mm (1.7 in)
1921	32.0 mm (1.3 in)
1930	22.9 mm (0.9 in)
1931	65.3 mm (2.6 in)
1932	56.9 mm (2.2 in)
1933	37.1 mm (1.5 in)
1934	54.6 mm (2.1 in)
1935	48.8 mm (1.9 in)
1936	38.1 mm (1.5 in)
1937	48.5 mm (1.9 in)
1938	50.0 mm (2.0 in)
1939	42.9 mm (1.7 in)
1940	129.8 mm (5.1 in)
1941	158.5 mm (6.2 in)
1942	61.2 mm (2.4 in)
1943	23.6 mm (0.9 in)
1944	42.4 mm (1.7 in)
1945	50.8 mm (2.0 in)
1946	78.7 mm (3.1 in)
1947	66.5 mm (2.6 in)
1948	84.3 mm (3.3 in)
1949	36.8 mm (1.4 in)
1950	67.1 mm (2.6 in)
1951	161.0 mm (6.3 in)
1952	66.5 mm (2.6 in)
1953	49.0 mm (1.9 in)
1954	53.3 mm (2.1 in)
1955	53.1 mm (2.1 in)
1956	111.0 mm (4.4 in)
1957	78.5 mm (3.1 in)
1958	35.6 mm (1.4 in)
1959	50.8 mm (2.0 in)
1960	88.9 mm (3.5 in)
1961	132.6 mm (5.2 in)
1962	66.0 mm (2.6 in)
1963	81.3 mm (3.2 in)
1964	57.2 mm (2.3 in)
1965	41.9 mm (1.6 in)
1966	75.9 mm (3.0 in)
1967	54.4 mm (2.1 in)
1968	68.8 mm (2.7 in)
1969	51.8 mm (2.0 in)
1970	59.7 mm (2.4 in)
1971	78.2 mm (3.1 in)
1972	76.5 mm (3.0 in)
1973	53.1 mm (2.1 in)
1974	65.5 mm (2.6 in)
1975	51.8 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Delaware 3 WSW, 1893 to 1975. The record is 182.7 mm (7.2 in) in 1961, marked on the chart; the median year is 74.4 mm (2.9 in).

Wettest five days (Rx5day) at Delaware 3 WSW by year
Year	Wettest five days (Rx5day)
1893	58.4 mm (2.3 in)
1894	21.8 mm (0.9 in)
1895	43.9 mm (1.7 in)
1896	35.3 mm (1.4 in)
1897	60.5 mm (2.4 in)
1898	42.4 mm (1.7 in)
1899	51.3 mm (2.0 in)
1900	98.5 mm (3.9 in)
1901	35.3 mm (1.4 in)
1902	66.0 mm (2.6 in)
1903	152.9 mm (6.0 in)
1904	31.2 mm (1.2 in)
1905	76.2 mm (3.0 in)
1906	37.2 mm (1.5 in)
1907	99.8 mm (3.9 in)
1908	51.8 mm (2.0 in)
1909	66.5 mm (2.6 in)
1910	45.7 mm (1.8 in)
1911	107.3 mm (4.2 in)
1912	56.6 mm (2.2 in)
1913	36.3 mm (1.4 in)
1914	46.0 mm (1.8 in)
1915	95.2 mm (3.7 in)
1916	44.2 mm (1.7 in)
1917	42.7 mm (1.7 in)
1918	58.5 mm (2.3 in)
1919	140.7 mm (5.5 in)
1920	34.8 mm (1.4 in)
1921	22.7 mm (0.9 in)
1930	6.6 mm (0.26 in)
1931	130.4 mm (5.1 in)
1932	17.5 mm (0.7 in)
1933	84.6 mm (3.3 in)
1934	92.5 mm (3.6 in)
1935	83.3 mm (3.3 in)
1936	45.7 mm (1.8 in)
1937	68.2 mm (2.7 in)
1938	72.3 mm (2.8 in)
1939	61.7 mm (2.4 in)
1940	131.1 mm (5.2 in)
1941	78.8 mm (3.1 in)
1942	62.5 mm (2.5 in)
1943	25.9 mm (1.0 in)
1944	74.4 mm (2.9 in)
1945	75.2 mm (3.0 in)
1946	62.7 mm (2.5 in)
1947	66.0 mm (2.6 in)
1948	84.3 mm (3.3 in)
1949	62.0 mm (2.4 in)
1950	78.8 mm (3.1 in)
1951	169.9 mm (6.7 in)
1952	79.2 mm (3.1 in)
1953	71.2 mm (2.8 in)
1954	107.7 mm (4.2 in)
1955	59.2 mm (2.3 in)
1956	132.3 mm (5.2 in)
1957	91.9 mm (3.6 in)
1958	55.2 mm (2.2 in)
1959	115.4 mm (4.5 in)
1960	112.5 mm (4.4 in)
1961	182.7 mm (7.2 in)
1962	110.2 mm (4.3 in)
1963	129.8 mm (5.1 in)
1964	111.0 mm (4.4 in)
1965	103.6 mm (4.1 in)
1966	90.6 mm (3.6 in)
1967	104.5 mm (4.1 in)
1968	100.9 mm (4.0 in)
1969	125.3 mm (4.9 in)
1970	116.4 mm (4.6 in)
1971	95.5 mm (3.8 in)
1972	103.7 mm (4.1 in)
1973	75.7 mm (3.0 in)
1974	110.7 mm (4.4 in)
1975	67.8 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Delaware 3 WSW, 1893 to 1975. The record is 56 days in 1952, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Delaware 3 WSW by year
Year	Longest dry spell (CDD)
1893	23 days
1894	21 days
1895	20 days
1896	17 days
1897	20 days
1898	16 days
1899	20 days
1900	17 days
1901	19 days
1902	18 days
1903	25 days
1904	30 days
1905	22 days
1906	20 days
1907	15 days
1908	24 days
1909	15 days
1910	29 days
1911	22 days
1912	19 days
1913	20 days
1914	17 days
1915	32 days
1916	19 days
1917	17 days
1918	18 days
1919	28 days
1920	19 days
1921	30 days
1930	28 days
1931	19 days
1932	22 days
1933	25 days
1934	19 days
1935	13 days
1936	21 days
1937	13 days
1938	22 days
1939	20 days
1940	15 days
1941	22 days
1942	32 days
1943	26 days
1944	24 days
1945	16 days
1946	25 days
1947	21 days
1948	20 days
1949	28 days
1950	30 days
1951	16 days
1952	56 days
1953	30 days
1954	23 days
1955	15 days
1956	21 days
1957	28 days
1958	27 days
1959	25 days
1960	22 days
1961	23 days
1962	19 days
1963	26 days
1964	33 days
1965	20 days
1966	25 days
1967	24 days
1968	36 days
1969	26 days
1970	21 days
1971	29 days
1972	23 days
1973	19 days
1974	14 days
1975	24 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

58 years with a frost

Across 58 years with a frost, the median last spring frost at Delaware 3 WSW falls on 5 May and the median first autumn frost on 5 October, which leaves a median of 154 days between them.

Fitted over all years, the growing season changes by -0.4 days per decade at this station.

Frost dates and growing season at Delaware 3 WSW
Measure	Median, all years	Earliest period	Recent period (1943 to 1975)	Recent against earliest	Fitted trend
Last spring frost	5 May	n/a	6 May	n/a	+0.2 days per decade
First autumn frost	5 October	n/a	3 October	n/a	-0.2 days per decade
Growing days	154 days	n/a	152 days	n/a	-0.4 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.

Station Changes

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

Download the Data

Data for Delaware 3 WSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Delaware 3 WSW 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).