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
Record highRecord low2026 daily maximum2026 daily minimum
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
Year with most
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
Complete yearUnder 90 percent of days
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.
Cooler than the station meanWarmer than the station mean
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.