Record envelope, standing records and threshold days for Cooperstown (USC00321766), North Dakota, United States, with 110 years of record.
Key Facts for Cooperstown
Cooperstown (USC00321766) is a weather station in North Dakota, United States at 47.41 latitude and -98.04 longitude, 421 m (1,380 ft) above sea level.
The station reports from 1903 to 2012, 110 years of record.
1,464 records set at Cooperstown still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Cooperstown tied a daily record low minimum temperature of 2.8 C (37.0 F) on 17 August 2012.
About the Station
Location: North Dakota, United States, 47.41 latitude, -98.04 longitude.
Elevation: 421 m (1,380 ft).
Period of record: 1903 to 2012, 110 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 Cooperstown. 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 Cooperstown, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-40.6 C (-41.1 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-43.9 C (-47.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-37.8 C (-36.0 F)
n/a
n/a
Apr
36.7 C (98.1 F)
-22.8 C (-9.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-10.6 C (12.9 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
47.8 C (118.0 F)
1.1 C (34.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-8.3 C (17.1 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-18.9 C (-2.0 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-35.0 C (-31.0 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Cooperstown still stand. 1936 holds the most, with 66.
Standing records at Cooperstown by the year they were set
Year set
Standing records
1903
2
1904
26
1905
23
1906
10
1907
20
1935
27
1936
66
1937
18
1938
12
1939
47
1940
20
1941
23
1942
28
1943
15
1944
19
1945
28
1946
18
1947
20
1948
21
1949
8
1950
28
1951
21
1952
19
1953
16
1954
13
1955
18
1956
12
1957
5
1958
16
1959
20
1960
7
1961
11
1962
16
1963
30
1964
13
1965
13
1966
7
1967
11
1968
21
1969
24
1970
7
1971
5
1972
13
1973
12
1974
11
1975
7
1976
20
1977
30
1978
15
1979
11
1980
8
1981
15
1982
6
1983
25
1984
13
1985
22
1986
11
1987
16
1988
20
1989
23
1990
19
1991
35
1992
25
1993
11
1994
9
1995
10
1996
18
1997
12
1998
14
1999
13
2000
26
2001
14
2002
32
2003
17
2004
20
2005
20
2006
18
2007
10
2008
13
2009
16
2010
10
2011
15
2012
25
All-Time Record Progression
4 new records
4 all-time records were set at Cooperstown between 2 September 1957 and 1 February 1996. Each dot is a new record.
When Cooperstown set new all-time records
Date
Kind
Detail
1957-09-02
Record daily precipitation
Record daily precipitation 88.4 mm (3.5 in)
1964-08-21
Record daily precipitation
Record daily precipitation 106.9 mm (4.2 in)
1993-07-25
Record daily precipitation
Record daily precipitation 160.0 mm (6.3 in)
1996-02-01
Record low maximum temperature
Record low maximum temperature -33.9 C (-29.0 F)
Wettest Day of Each Month
Jul: 160.0 mm (6.3 in)
The wettest day on record for each calendar month at Cooperstown. The most was 160.0 mm (6.3 in) on 25 July 1993.
Record daily precipitation for each month at Cooperstown
Month
Record daily precipitation (mm)
Date
Jan
25.4 mm (1.0 in)
28 January 1916
Feb
37.6 mm (1.5 in)
8 February 1937
Mar
48.3 mm (1.9 in)
27 March 2004
Apr
45.7 mm (1.8 in)
15 April 1924
May
90.7 mm (3.6 in)
11 May 1985
Jun
77.0 mm (3.0 in)
3 June 2005
Jul
160.0 mm (6.3 in)
25 July 1993
Aug
106.9 mm (4.2 in)
21 August 1964
Sep
92.2 mm (3.6 in)
5 September 1969
Oct
70.1 mm (2.8 in)
26 October 2000
Nov
41.4 mm (1.6 in)
14 November 1928
Dec
27.4 mm (1.1 in)
30 December 2006
Period of Record Coverage
1903 to 2012
Complete yearUnder 90 percent of days
84 years of record at Cooperstown, 1903 to 2012. 11 years have data for under 90 percent of days and are left out of rankings: 1903, 1904, 1905, 1906, 1907, 1934, 1950, 1994 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 69 complete years at Cooperstown, 1935 to 2011. Blue stripes are years cooler than the station's own mean of 4.5 C (40.1 F); red stripes are warmer. The coolest year was 1951, at 1.8 C (35.3 F), and the warmest was 1987, at 7.3 C (45.2 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Cooperstown as warming stripes, 1935 to 2011
Year
Annual mean temperature
Difference from the station mean
1935
3.4 C
-1.14 C
1936
2.9 C
-1.57 C
1937
2.2 C
-2.27 C
1938
4.4 C
-0.12 C
1939
4.2 C
-0.30 C
1940
4.0 C
-0.47 C
1941
4.5 C
+0.00 C
1942
4.2 C
-0.29 C
1943
5.0 C
+0.47 C
1944
5.6 C
+1.10 C
1945
4.0 C
-0.46 C
1946
4.1 C
-0.35 C
1947
4.3 C
-0.20 C
1948
4.1 C
-0.44 C
1951
1.8 C
-2.67 C
1952
5.3 C
+0.79 C
1953
6.0 C
+1.50 C
1954
5.3 C
+0.77 C
1955
4.3 C
-0.23 C
1957
4.6 C
+0.13 C
1958
5.0 C
+0.50 C
1959
4.5 C
+0.01 C
1960
4.4 C
-0.13 C
1961
5.1 C
+0.61 C
1962
4.5 C
+0.00 C
1963
6.1 C
+1.57 C
1964
4.9 C
+0.43 C
1965
3.8 C
-0.74 C
1966
3.9 C
-0.61 C
1967
4.7 C
+0.18 C
1968
4.7 C
+0.23 C
1969
4.0 C
-0.47 C
1970
4.1 C
-0.43 C
1971
4.3 C
-0.24 C
1972
3.7 C
-0.77 C
1973
5.9 C
+1.45 C
1974
4.4 C
-0.08 C
1975
4.8 C
+0.30 C
1976
5.5 C
+1.01 C
1977
5.3 C
+0.80 C
1978
4.0 C
-0.50 C
1979
3.0 C
-1.53 C
1980
5.0 C
+0.50 C
1981
6.1 C
+1.60 C
1982
3.7 C
-0.82 C
1983
5.5 C
+1.01 C
1984
5.4 C
+0.95 C
1985
4.0 C
-0.46 C
1986
5.3 C
+0.85 C
1987
7.3 C
+2.82 C
1988
5.6 C
+1.09 C
1989
4.1 C
-0.36 C
1990
6.1 C
+1.61 C
1991
5.8 C
+1.27 C
1992
4.9 C
+0.39 C
1993
3.6 C
-0.86 C
1995
3.8 C
-0.66 C
1996
2.3 C
-2.21 C
1997
3.9 C
-0.58 C
1998
5.5 C
+0.96 C
1999
5.1 C
+0.65 C
2002
4.4 C
-0.10 C
2003
3.8 C
-0.73 C
2004
3.7 C
-0.83 C
2005
5.0 C
+0.52 C
2006
5.6 C
+1.14 C
2008
2.7 C
-1.79 C
2009
2.9 C
-1.55 C
2011
4.0 C
-0.47 C
The fitted trend in annual mean temperature here over 1935 to 2011 is 0.05 C (-0.07 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 69 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Cooperstown
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.05 C (-0.07 to 0.16) per decade
0.1 F (-0.1 to 0.3) per decade
1935 to 2011
69
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1935 to 2011
69
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.3 F (0.1 to 0.5) per decade
1935 to 2011
69
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
1903 to 2012
Yearly extremes at Cooperstown: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
47.8 C (118.0 F)
1936
36.1 C (97.0 F)
84
Coldest night (TNn)
-43.9 C (-47.0 F)
1936
-35.6 C (-32.1 F)
84
Wettest day (Rx1day)
160.0 mm (6.3 in)
1993
45.5 mm (1.8 in)
103
Wettest five days (Rx5day)
196.7 mm (7.7 in)
1993
65.2 mm (2.6 in)
103
Longest dry spell (CDD)
90 days
1920
32 days
103
Hottest day (TXx)
The hottest day of the year at Cooperstown, 1903 to 2012. The record is 47.8 C (118.0 F) in 1936, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Cooperstown by year
Year
Hottest day (TXx)
1903
21.7 C (71.1 F)
1904
31.1 C (88.0 F)
1905
34.4 C (93.9 F)
1906
38.9 C (102.0 F)
1907
33.3 C (91.9 F)
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
5.6 C (42.1 F)
1935
37.2 C (99.0 F)
1936
47.8 C (118.0 F)
1937
36.7 C (98.1 F)
1938
35.6 C (96.1 F)
1939
38.9 C (102.0 F)
1940
40.0 C (104.0 F)
1941
37.8 C (100.0 F)
1942
33.9 C (93.0 F)
1943
35.6 C (96.1 F)
1944
36.1 C (97.0 F)
1945
38.3 C (100.9 F)
1946
37.2 C (99.0 F)
1947
42.2 C (108.0 F)
1948
36.7 C (98.1 F)
1949
37.2 C (99.0 F)
1950
35.0 C (95.0 F)
1951
36.7 C (98.1 F)
1952
37.2 C (99.0 F)
1953
37.2 C (99.0 F)
1954
37.2 C (99.0 F)
1955
37.8 C (100.0 F)
1956
36.7 C (98.1 F)
1957
37.8 C (100.0 F)
1958
38.9 C (102.0 F)
1959
38.3 C (100.9 F)
1960
36.1 C (97.0 F)
1961
37.2 C (99.0 F)
1962
33.9 C (93.0 F)
1963
35.0 C (95.0 F)
1964
36.7 C (98.1 F)
1965
36.7 C (98.1 F)
1966
33.3 C (91.9 F)
1967
35.0 C (95.0 F)
1968
36.7 C (98.1 F)
1969
37.8 C (100.0 F)
1970
36.1 C (97.0 F)
1971
36.7 C (98.1 F)
1972
35.6 C (96.1 F)
1973
38.9 C (102.0 F)
1974
36.1 C (97.0 F)
1975
37.8 C (100.0 F)
1976
38.9 C (102.0 F)
1977
35.0 C (95.0 F)
1978
39.4 C (102.9 F)
1979
34.4 C (93.9 F)
1980
38.3 C (100.9 F)
1981
36.1 C (97.0 F)
1982
37.2 C (99.0 F)
1983
40.0 C (104.0 F)
1984
38.9 C (102.0 F)
1985
37.8 C (100.0 F)
1986
34.4 C (93.9 F)
1987
34.4 C (93.9 F)
1988
40.0 C (104.0 F)
1989
37.8 C (100.0 F)
1990
34.4 C (93.9 F)
1991
36.7 C (98.1 F)
1992
33.3 C (91.9 F)
1993
32.2 C (90.0 F)
1994
31.1 C (88.0 F)
1995
35.6 C (96.1 F)
1996
33.9 C (93.0 F)
1997
32.2 C (90.0 F)
1998
34.4 C (93.9 F)
1999
33.9 C (93.0 F)
2000
35.0 C (95.0 F)
2001
33.9 C (93.0 F)
2002
36.7 C (98.1 F)
2003
34.4 C (93.9 F)
2004
31.7 C (89.1 F)
2005
32.2 C (90.0 F)
2006
37.8 C (100.0 F)
2007
33.9 C (93.0 F)
2008
33.3 C (91.9 F)
2009
35.6 C (96.1 F)
2010
33.3 C (91.9 F)
2011
32.8 C (91.0 F)
2012
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Cooperstown, 1903 to 2012. The record is -43.9 C (-47.0 F) in 1936, marked on the chart; the median year is -35.6 C (-32.1 F).
Coldest night (TNn) at Cooperstown by year
Year
Coldest night (TNn)
1903
-32.8 C (-27.0 F)
1904
-40.0 C (-40.0 F)
1905
-38.9 C (-38.0 F)
1906
-10.0 C (14.0 F)
1907
-40.0 C (-40.0 F)
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
-34.4 C (-29.9 F)
1935
-36.7 C (-34.1 F)
1936
-43.9 C (-47.0 F)
1937
-40.6 C (-41.1 F)
1938
-36.7 C (-34.1 F)
1939
-41.1 C (-42.0 F)
1940
-34.4 C (-29.9 F)
1941
-36.7 C (-34.1 F)
1942
-33.3 C (-27.9 F)
1943
-37.2 C (-35.0 F)
1944
-34.4 C (-29.9 F)
1945
-35.6 C (-32.1 F)
1946
-37.8 C (-36.0 F)
1947
-34.4 C (-29.9 F)
1948
-37.8 C (-36.0 F)
1949
-33.9 C (-29.0 F)
1950
-38.3 C (-36.9 F)
1951
-38.9 C (-38.0 F)
1952
-33.9 C (-29.0 F)
1953
-31.1 C (-24.0 F)
1954
-37.2 C (-35.0 F)
1955
-34.4 C (-29.9 F)
1956
-36.7 C (-34.1 F)
1957
-35.0 C (-31.0 F)
1958
-32.8 C (-27.0 F)
1959
-36.7 C (-34.1 F)
1960
-34.4 C (-29.9 F)
1961
-36.1 C (-33.0 F)
1962
-34.4 C (-29.9 F)
1963
-37.2 C (-35.0 F)
1964
-30.6 C (-23.1 F)
1965
-35.6 C (-32.1 F)
1966
-37.2 C (-35.0 F)
1967
-37.2 C (-35.0 F)
1968
-37.2 C (-35.0 F)
1969
-31.1 C (-24.0 F)
1970
-36.1 C (-33.0 F)
1971
-34.4 C (-29.9 F)
1972
-36.7 C (-34.1 F)
1973
-33.9 C (-29.0 F)
1974
-34.4 C (-29.9 F)
1975
-34.4 C (-29.9 F)
1976
-33.9 C (-29.0 F)
1977
-36.7 C (-34.1 F)
1978
-33.9 C (-29.0 F)
1979
-36.1 C (-33.0 F)
1980
-33.3 C (-27.9 F)
1981
-30.6 C (-23.1 F)
1982
-37.8 C (-36.0 F)
1983
-37.2 C (-35.0 F)
1984
-35.6 C (-32.1 F)
1985
-35.6 C (-32.1 F)
1986
-35.0 C (-31.0 F)
1987
-31.1 C (-24.0 F)
1988
-36.1 C (-33.0 F)
1989
-36.1 C (-33.0 F)
1990
-37.2 C (-35.0 F)
1991
-31.1 C (-24.0 F)
1992
-30.6 C (-23.1 F)
1993
-34.4 C (-29.9 F)
1994
-25.0 C (-13.0 F)
1995
-28.9 C (-20.0 F)
1996
-38.9 C (-38.0 F)
1997
-35.6 C (-32.1 F)
1998
-31.7 C (-25.1 F)
1999
-34.4 C (-29.9 F)
2000
-32.8 C (-27.0 F)
2001
-35.0 C (-31.0 F)
2002
-28.3 C (-18.9 F)
2003
-36.7 C (-34.1 F)
2004
-38.9 C (-38.0 F)
2005
-37.2 C (-35.0 F)
2006
-33.3 C (-27.9 F)
2007
-35.0 C (-31.0 F)
2008
-37.2 C (-35.0 F)
2009
-37.8 C (-36.0 F)
2010
-40.0 C (-40.0 F)
2011
-36.1 C (-33.0 F)
2012
-28.3 C (-18.9 F)
Wettest day (Rx1day)
The wettest day of the year at Cooperstown, 1903 to 2012. The record is 160.0 mm (6.3 in) in 1993, marked on the chart; the median year is 45.5 mm (1.8 in).
Wettest day (Rx1day) at Cooperstown by year
Year
Wettest day (Rx1day)
1903
12.7 mm (0.5 in)
1904
35.6 mm (1.4 in)
1905
72.9 mm (2.9 in)
1906
40.1 mm (1.6 in)
1907
29.2 mm (1.1 in)
1915
15.2 mm (0.6 in)
1916
39.4 mm (1.6 in)
1917
25.4 mm (1.0 in)
1918
78.2 mm (3.1 in)
1919
39.4 mm (1.6 in)
1920
50.8 mm (2.0 in)
1921
53.3 mm (2.1 in)
1922
44.5 mm (1.8 in)
1923
39.4 mm (1.6 in)
1924
53.3 mm (2.1 in)
1925
65.3 mm (2.6 in)
1926
50.8 mm (2.0 in)
1927
37.1 mm (1.5 in)
1928
44.2 mm (1.7 in)
1929
20.3 mm (0.8 in)
1930
32.5 mm (1.3 in)
1931
47.5 mm (1.9 in)
1932
55.9 mm (2.2 in)
1933
29.2 mm (1.1 in)
1934
49.8 mm (2.0 in)
1935
33.5 mm (1.3 in)
1936
46.0 mm (1.8 in)
1937
74.7 mm (2.9 in)
1938
53.3 mm (2.1 in)
1939
32.0 mm (1.3 in)
1940
19.6 mm (0.8 in)
1941
67.3 mm (2.6 in)
1942
32.5 mm (1.3 in)
1943
37.1 mm (1.5 in)
1944
53.3 mm (2.1 in)
1945
36.6 mm (1.4 in)
1946
70.1 mm (2.8 in)
1947
39.4 mm (1.6 in)
1948
42.4 mm (1.7 in)
1949
75.2 mm (3.0 in)
1950
50.8 mm (2.0 in)
1951
29.7 mm (1.2 in)
1952
68.6 mm (2.7 in)
1953
55.9 mm (2.2 in)
1954
40.6 mm (1.6 in)
1955
26.7 mm (1.1 in)
1956
38.6 mm (1.5 in)
1957
88.4 mm (3.5 in)
1958
26.2 mm (1.0 in)
1959
46.2 mm (1.8 in)
1960
39.4 mm (1.6 in)
1961
63.5 mm (2.5 in)
1962
38.1 mm (1.5 in)
1963
84.8 mm (3.3 in)
1964
106.9 mm (4.2 in)
1965
50.8 mm (2.0 in)
1966
57.4 mm (2.3 in)
1967
59.7 mm (2.4 in)
1968
42.2 mm (1.7 in)
1969
92.2 mm (3.6 in)
1970
87.6 mm (3.4 in)
1971
32.3 mm (1.3 in)
1972
43.7 mm (1.7 in)
1973
62.7 mm (2.5 in)
1974
39.4 mm (1.6 in)
1975
47.2 mm (1.9 in)
1976
21.1 mm (0.8 in)
1977
45.5 mm (1.8 in)
1978
43.7 mm (1.7 in)
1979
34.8 mm (1.4 in)
1980
41.7 mm (1.6 in)
1981
38.9 mm (1.5 in)
1982
69.1 mm (2.7 in)
1983
61.0 mm (2.4 in)
1984
29.7 mm (1.2 in)
1985
90.7 mm (3.6 in)
1986
39.4 mm (1.6 in)
1987
48.8 mm (1.9 in)
1988
37.1 mm (1.5 in)
1989
37.8 mm (1.5 in)
1990
46.7 mm (1.8 in)
1991
46.0 mm (1.8 in)
1992
70.4 mm (2.8 in)
1993
160.0 mm (6.3 in)
1994
60.7 mm (2.4 in)
1995
74.4 mm (2.9 in)
1996
48.5 mm (1.9 in)
1997
54.6 mm (2.1 in)
1998
37.6 mm (1.5 in)
1999
37.1 mm (1.5 in)
2000
70.1 mm (2.8 in)
2001
34.8 mm (1.4 in)
2002
47.0 mm (1.9 in)
2003
43.2 mm (1.7 in)
2004
62.2 mm (2.4 in)
2005
77.0 mm (3.0 in)
2006
34.0 mm (1.3 in)
2007
47.0 mm (1.9 in)
2008
41.9 mm (1.6 in)
2009
43.2 mm (1.7 in)
2010
50.8 mm (2.0 in)
2011
92.7 mm (3.6 in)
2012
19.8 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Cooperstown, 1903 to 2012. The record is 196.7 mm (7.7 in) in 1993, marked on the chart; the median year is 65.2 mm (2.6 in).
Wettest five days (Rx5day) at Cooperstown by year
Year
Wettest five days (Rx5day)
1903
22.9 mm (0.9 in)
1904
66.0 mm (2.6 in)
1905
79.8 mm (3.1 in)
1906
57.9 mm (2.3 in)
1907
53.8 mm (2.1 in)
1915
15.2 mm (0.6 in)
1916
58.4 mm (2.3 in)
1917
25.4 mm (1.0 in)
1918
160.0 mm (6.3 in)
1919
64.8 mm (2.6 in)
1920
63.2 mm (2.5 in)
1921
73.2 mm (2.9 in)
1922
53.4 mm (2.1 in)
1923
63.5 mm (2.5 in)
1924
69.9 mm (2.8 in)
1925
65.3 mm (2.6 in)
1926
67.3 mm (2.6 in)
1927
42.1 mm (1.7 in)
1928
55.6 mm (2.2 in)
1929
35.0 mm (1.4 in)
1930
47.7 mm (1.9 in)
1931
55.1 mm (2.2 in)
1932
59.7 mm (2.4 in)
1933
33.3 mm (1.3 in)
1934
73.1 mm (2.9 in)
1935
49.7 mm (2.0 in)
1936
50.1 mm (2.0 in)
1937
81.3 mm (3.2 in)
1938
61.2 mm (2.4 in)
1939
35.0 mm (1.4 in)
1940
37.1 mm (1.5 in)
1941
107.9 mm (4.2 in)
1942
71.4 mm (2.8 in)
1943
54.3 mm (2.1 in)
1944
62.0 mm (2.4 in)
1945
54.6 mm (2.1 in)
1946
118.8 mm (4.7 in)
1947
58.2 mm (2.3 in)
1948
57.6 mm (2.3 in)
1949
109.0 mm (4.3 in)
1950
78.5 mm (3.1 in)
1951
76.9 mm (3.0 in)
1952
81.8 mm (3.2 in)
1953
81.3 mm (3.2 in)
1954
61.6 mm (2.4 in)
1955
56.5 mm (2.2 in)
1956
54.9 mm (2.2 in)
1957
163.8 mm (6.4 in)
1958
58.0 mm (2.3 in)
1959
62.4 mm (2.5 in)
1960
57.9 mm (2.3 in)
1961
82.5 mm (3.2 in)
1962
78.5 mm (3.1 in)
1963
140.7 mm (5.5 in)
1964
129.2 mm (5.1 in)
1965
75.2 mm (3.0 in)
1966
84.0 mm (3.3 in)
1967
63.5 mm (2.5 in)
1968
97.8 mm (3.9 in)
1969
96.5 mm (3.8 in)
1970
108.2 mm (4.3 in)
1971
52.2 mm (2.1 in)
1972
93.2 mm (3.7 in)
1973
96.2 mm (3.8 in)
1974
49.6 mm (2.0 in)
1975
55.7 mm (2.2 in)
1976
40.9 mm (1.6 in)
1977
54.7 mm (2.2 in)
1978
72.9 mm (2.9 in)
1979
66.1 mm (2.6 in)
1980
53.6 mm (2.1 in)
1981
46.5 mm (1.8 in)
1982
133.9 mm (5.3 in)
1983
73.4 mm (2.9 in)
1984
68.8 mm (2.7 in)
1985
129.5 mm (5.1 in)
1986
60.4 mm (2.4 in)
1987
105.6 mm (4.2 in)
1988
53.8 mm (2.1 in)
1989
73.3 mm (2.9 in)
1990
60.7 mm (2.4 in)
1991
53.6 mm (2.1 in)
1992
72.0 mm (2.8 in)
1993
196.7 mm (7.7 in)
1994
84.1 mm (3.3 in)
1995
75.2 mm (3.0 in)
1996
68.1 mm (2.7 in)
1997
76.2 mm (3.0 in)
1998
46.0 mm (1.8 in)
1999
76.7 mm (3.0 in)
2000
90.2 mm (3.6 in)
2001
65.2 mm (2.6 in)
2002
65.3 mm (2.6 in)
2003
61.8 mm (2.4 in)
2004
105.9 mm (4.2 in)
2005
88.9 mm (3.5 in)
2006
46.0 mm (1.8 in)
2007
67.1 mm (2.6 in)
2008
61.5 mm (2.4 in)
2009
58.9 mm (2.3 in)
2010
118.4 mm (4.7 in)
2011
106.2 mm (4.2 in)
2012
28.7 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Cooperstown, 1903 to 2012. The record is 90 days in 1920, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Cooperstown by year
Year
Longest dry spell (CDD)
1903
50 days
1904
30 days
1905
75 days
1906
22 days
1907
64 days
1915
37 days
1916
37 days
1917
50 days
1918
71 days
1919
51 days
1920
90 days
1921
32 days
1922
37 days
1923
59 days
1924
41 days
1925
39 days
1926
41 days
1927
29 days
1928
59 days
1929
17 days
1930
17 days
1931
34 days
1932
39 days
1933
40 days
1934
47 days
1935
37 days
1936
36 days
1937
30 days
1938
36 days
1939
51 days
1940
19 days
1941
27 days
1942
61 days
1943
35 days
1944
32 days
1945
25 days
1946
43 days
1947
27 days
1948
25 days
1949
31 days
1950
37 days
1951
29 days
1952
43 days
1953
30 days
1954
44 days
1955
20 days
1956
28 days
1957
30 days
1958
32 days
1959
33 days
1960
34 days
1961
41 days
1962
22 days
1963
38 days
1964
37 days
1965
27 days
1966
28 days
1967
26 days
1968
27 days
1969
23 days
1970
18 days
1971
32 days
1972
27 days
1973
26 days
1974
39 days
1975
19 days
1976
51 days
1977
27 days
1978
30 days
1979
25 days
1980
64 days
1981
29 days
1982
29 days
1983
30 days
1984
23 days
1985
40 days
1986
46 days
1987
51 days
1988
48 days
1989
32 days
1990
46 days
1991
43 days
1992
44 days
1993
29 days
1994
20 days
1995
27 days
1996
17 days
1997
19 days
1998
27 days
1999
46 days
2000
14 days
2001
32 days
2002
35 days
2003
38 days
2004
26 days
2005
79 days
2006
54 days
2007
31 days
2008
34 days
2009
29 days
2010
25 days
2011
43 days
2012
20 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
69 years with a frost
Across 69 years with a frost, the median last spring frost at Cooperstown falls on 18 May and the median first autumn frost on 20 September, which leaves a median of 125 days between them.
In 1977 to 2011 the median growing season was 128 days. That is 5 days more than in 1935 to 1967.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
Frost dates and growing season at Cooperstown
Measure
Median, all years
Earliest period (1935 to 1967)
Recent period (1977 to 2011)
Recent against earliest
Fitted trend
Last spring frost
18 May
23 May
16 May
7 days earlier
-1.4 days per decade
First autumn frost
20 September
19 September
21 September
2 days later
+0.1 days per decade
Growing days
125 days
123 days
128 days
5 days more
+1.5 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
90 years, 1916 to 2011
A day with at least 46.6 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 129.7 mm (5.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Cooperstown: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
46.6 mm (1.8 in)
5 years
64.0 mm (2.5 in)
10 years
77.2 mm (3.0 in)
25 years
96.2 mm (3.8 in)
50 years
112.1 mm (4.4 in)
100 years
129.7 mm (5.1 in)
Longer than the 90 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, 90 years of values from 1916 to 2011.
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: 160.0 mm (6.3 in) in 1993; 106.9 mm (4.2 in) in 1964; 92.7 mm (3.6 in) in 2011.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Cooperstown, at 1996. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1996 ran 0.4 C (0.7 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Cooperstown, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1996
-0.4
-0.7
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 Cooperstown standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Cooperstown 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.