Record envelope, standing records and threshold days for Windsor (USC00239032), Missouri, United States, with 117 years of record.
Key Facts for Windsor
Windsor (USC00239032) is a weather station in Missouri, United States at 38.53 latitude and -93.52 longitude, 256 m (840 ft) above sea level.
The station reports from 1893 to 2009, 117 years of record.
1,464 records set at Windsor still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Windsor set a daily record precipitation of 81.3 mm (3.2 in) on 9 October 2009.
About the Station
Location: Missouri, United States, 38.53 latitude, -93.52 longitude.
Elevation: 256 m (840 ft).
Period of record: 1893 to 2009, 117 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 Windsor. 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 Windsor, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.3 C (73.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Feb
25.6 C (78.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-8.3 C (17.1 F)
n/a
n/a
May
35.6 C (96.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
46.1 C (115.0 F)
7.8 C (46.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
5.6 C (42.1 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-2.2 C (28.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
31.1 C (88.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Dec
24.4 C (75.9 F)
-27.8 C (-18.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Windsor still stand. 1954 holds the most, with 47.
Standing records at Windsor by the year they were set
Year set
Standing records
1893
26
1894
38
1895
39
1896
20
1897
29
1898
33
1899
39
1900
23
1901
20
1902
11
1903
15
1904
5
1905
15
1906
19
1907
25
1908
7
1950
16
1951
19
1952
31
1953
30
1954
47
1955
11
1956
25
1957
8
1958
14
1959
14
1960
17
1961
9
1962
12
1963
29
1964
17
1965
21
1966
19
1967
33
1968
2
1969
9
1970
14
1971
18
1972
23
1973
12
1974
22
1975
13
1976
32
1977
14
1978
15
1979
27
1980
35
1981
16
1982
19
1983
40
1984
23
1985
18
1986
15
1987
17
1988
7
1990
11
1991
24
1992
20
1993
20
1994
14
1995
17
1996
23
1997
14
1998
19
1999
23
2000
22
2001
12
2002
12
2003
17
2004
14
2005
9
2006
25
2007
9
2008
17
2009
15
All-Time Record Progression
1 new records
1 all-time records were set at Windsor between 5 August 1980 and 5 August 1980. Each dot is a new record.
When Windsor set new all-time records
Date
Kind
Detail
1980-08-05
Record daily precipitation
Record daily precipitation 246.6 mm (9.7 in)
Wettest Day of Each Month
Aug: 246.6 mm (9.7 in)
The wettest day on record for each calendar month at Windsor. The most was 246.6 mm (9.7 in) on 5 August 1980.
Record daily precipitation for each month at Windsor
Month
Record daily precipitation (mm)
Date
Jan
75.2 mm (3.0 in)
20 January 1894
Feb
90.2 mm (3.6 in)
20 February 1997
Mar
78.2 mm (3.1 in)
4 March 1976
Apr
159.5 mm (6.3 in)
21 April 1973
May
99.1 mm (3.9 in)
16 May 1986
Jun
110.5 mm (4.4 in)
11 June 1981
Jul
125.7 mm (4.9 in)
3 July 1956
Aug
246.6 mm (9.7 in)
5 August 1980
Sep
152.4 mm (6.0 in)
13 September 1998
Oct
140.0 mm (5.5 in)
12 October 1969
Nov
74.4 mm (2.9 in)
3 November 1983
Dec
76.2 mm (3.0 in)
3 December 1982
Period of Record Coverage
1893 to 2009
Complete yearUnder 90 percent of days
75 years of record at Windsor, 1893 to 2009. 15 years have data for under 90 percent of days and are left out of rankings: 1902, 1903, 1904, 1905, 1907, 1908, 1950, 1962 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 55 complete years at Windsor, 1893 to 2008. Blue stripes are years cooler than the station's own mean of 12.6 C (54.7 F); red stripes are warmer. The coolest year was 1979, at 10.5 C (50.9 F), and the warmest was 1954, at 14.8 C (58.6 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Windsor as warming stripes, 1893 to 2008
Year
Annual mean temperature
Difference from the station mean
1893
12.8 C
+0.21 C
1894
13.2 C
+0.63 C
1895
11.8 C
-0.85 C
1896
13.1 C
+0.47 C
1897
13.0 C
+0.42 C
1898
12.2 C
-0.41 C
1899
12.3 C
-0.27 C
1900
13.4 C
+0.76 C
1906
12.7 C
+0.08 C
1951
11.9 C
-0.72 C
1952
13.3 C
+0.73 C
1953
14.5 C
+1.90 C
1954
14.8 C
+2.18 C
1955
13.4 C
+0.82 C
1956
14.0 C
+1.39 C
1957
13.1 C
+0.47 C
1958
12.3 C
-0.26 C
1959
13.0 C
+0.36 C
1960
12.4 C
-0.16 C
1961
12.3 C
-0.27 C
1963
13.6 C
+1.04 C
1964
13.8 C
+1.15 C
1965
13.5 C
+0.94 C
1966
12.3 C
-0.34 C
1969
12.0 C
-0.65 C
1970
12.4 C
-0.21 C
1971
12.7 C
+0.10 C
1972
12.0 C
-0.64 C
1973
12.7 C
+0.11 C
1974
12.1 C
-0.55 C
1975
12.3 C
-0.29 C
1976
12.0 C
-0.64 C
1977
12.4 C
-0.24 C
1978
10.9 C
-1.66 C
1979
10.5 C
-2.11 C
1980
12.0 C
-0.62 C
1981
12.1 C
-0.53 C
1982
11.2 C
-1.45 C
1983
11.9 C
-0.70 C
1984
11.9 C
-0.73 C
1986
13.4 C
+0.78 C
1987
13.1 C
+0.49 C
1991
12.9 C
+0.27 C
1992
12.0 C
-0.65 C
1994
11.8 C
-0.76 C
1996
11.0 C
-1.58 C
1997
11.4 C
-1.23 C
1998
13.3 C
+0.71 C
1999
13.5 C
+0.88 C
2002
13.0 C
+0.39 C
2003
12.4 C
-0.20 C
2004
12.6 C
+0.00 C
2005
13.2 C
+0.56 C
2006
13.9 C
+1.34 C
2008
12.0 C
-0.59 C
The fitted trend in annual mean temperature here over 1893 to 2008 is -0.04 C (-0.11 to 0.03) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.08 F (-0.21 to 0.05) per decade. The slope is a straight line fitted to 55 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Windsor
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.04 C (-0.11 to 0.03) per decade
-0.08 F (-0.21 to 0.05) per decade
1893 to 2008
55
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.2 to -0.1) per decade
-0.2 F (-0.4 to -0.1) per decade
1893 to 2008
55
Fall
Mean daily minimum
0.04 C (-0.05 to 0.13) per decade
0.1 F (-0.1 to 0.2) per decade
1893 to 2008
55
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 2009
Yearly extremes at Windsor: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
46.1 C (115.0 F)
1954
37.2 C (99.0 F)
75
Coldest night (TNn)
-34.4 C (-29.9 F)
1905
-20.6 C (-5.1 F)
75
Wettest day (Rx1day)
246.6 mm (9.7 in)
1980
72.9 mm (2.9 in)
77
Wettest five days (Rx5day)
277.9 mm (10.9 in)
1986
121.2 mm (4.8 in)
77
Longest dry spell (CDD)
45 days
1999
23 days
77
Hottest day (TXx)
The hottest day of the year at Windsor, 1893 to 2009. The record is 46.1 C (115.0 F) in 1954, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Windsor by year
Year
Hottest day (TXx)
1893
40.0 C (104.0 F)
1894
39.4 C (102.9 F)
1895
37.8 C (100.0 F)
1896
40.6 C (105.1 F)
1897
40.6 C (105.1 F)
1898
35.6 C (96.1 F)
1899
38.9 C (102.0 F)
1900
37.2 C (99.0 F)
1901
42.8 C (109.0 F)
1902
35.6 C (96.1 F)
1903
34.4 C (93.9 F)
1904
36.1 C (97.0 F)
1905
37.2 C (99.0 F)
1906
34.4 C (93.9 F)
1907
36.1 C (97.0 F)
1908
36.7 C (98.1 F)
1948
n/a
1949
n/a
1950
31.7 C (89.1 F)
1951
36.1 C (97.0 F)
1952
39.4 C (102.9 F)
1953
38.3 C (100.9 F)
1954
46.1 C (115.0 F)
1955
38.3 C (100.9 F)
1956
37.2 C (99.0 F)
1957
37.8 C (100.0 F)
1958
34.4 C (93.9 F)
1959
35.6 C (96.1 F)
1960
37.2 C (99.0 F)
1961
33.3 C (91.9 F)
1962
38.3 C (100.9 F)
1963
37.8 C (100.0 F)
1964
38.9 C (102.0 F)
1965
36.1 C (97.0 F)
1966
38.3 C (100.9 F)
1967
35.0 C (95.0 F)
1968
31.1 C (88.0 F)
1969
35.6 C (96.1 F)
1970
39.4 C (102.9 F)
1971
37.8 C (100.0 F)
1972
38.3 C (100.9 F)
1973
37.8 C (100.0 F)
1974
40.6 C (105.1 F)
1975
38.3 C (100.9 F)
1976
37.8 C (100.0 F)
1977
37.2 C (99.0 F)
1978
38.3 C (100.9 F)
1979
35.6 C (96.1 F)
1980
42.8 C (109.0 F)
1981
35.0 C (95.0 F)
1982
36.7 C (98.1 F)
1983
40.6 C (105.1 F)
1984
41.7 C (107.1 F)
1985
36.7 C (98.1 F)
1986
40.6 C (105.1 F)
1987
37.8 C (100.0 F)
1988
32.2 C (90.0 F)
1990
36.7 C (98.1 F)
1991
39.4 C (102.9 F)
1992
34.4 C (93.9 F)
1993
36.1 C (97.0 F)
1994
35.0 C (95.0 F)
1995
37.2 C (99.0 F)
1996
35.6 C (96.1 F)
1997
36.7 C (98.1 F)
1998
36.7 C (98.1 F)
1999
37.8 C (100.0 F)
2000
39.4 C (102.9 F)
2001
35.0 C (95.0 F)
2002
36.1 C (97.0 F)
2003
39.4 C (102.9 F)
2004
34.4 C (93.9 F)
2005
39.4 C (102.9 F)
2006
40.6 C (105.1 F)
2007
37.8 C (100.0 F)
2008
36.7 C (98.1 F)
2009
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Windsor, 1893 to 2009. The record is -34.4 C (-29.9 F) in 1905, marked on the chart; the median year is -20.6 C (-5.1 F).
Coldest night (TNn) at Windsor by year
Year
Coldest night (TNn)
1893
-22.8 C (-9.0 F)
1894
-31.1 C (-24.0 F)
1895
-32.2 C (-26.0 F)
1896
-17.8 C (0.0 F)
1897
-20.0 C (-4.0 F)
1898
-26.1 C (-15.0 F)
1899
-33.9 C (-29.0 F)
1900
-26.7 C (-16.1 F)
1901
-27.8 C (-18.0 F)
1902
-27.2 C (-17.0 F)
1903
-28.9 C (-20.0 F)
1904
-25.0 C (-13.0 F)
1905
-34.4 C (-29.9 F)
1906
-19.4 C (-2.9 F)
1907
-17.2 C (1.0 F)
1908
-13.3 C (8.1 F)
1948
n/a
1949
n/a
1950
-19.4 C (-2.9 F)
1951
-23.9 C (-11.0 F)
1952
-15.6 C (3.9 F)
1953
-18.3 C (-0.9 F)
1954
-16.7 C (1.9 F)
1955
-20.0 C (-4.0 F)
1956
-16.1 C (3.0 F)
1957
-17.2 C (1.0 F)
1958
-20.6 C (-5.1 F)
1959
-25.6 C (-14.1 F)
1960
-22.2 C (-8.0 F)
1961
-20.0 C (-4.0 F)
1962
-22.2 C (-8.0 F)
1963
-22.8 C (-9.0 F)
1964
-20.0 C (-4.0 F)
1965
-20.6 C (-5.1 F)
1966
-22.8 C (-9.0 F)
1967
-17.8 C (0.0 F)
1968
-21.1 C (-6.0 F)
1969
-21.1 C (-6.0 F)
1970
-23.9 C (-11.0 F)
1971
-19.4 C (-2.9 F)
1972
-22.2 C (-8.0 F)
1973
-20.0 C (-4.0 F)
1974
-24.4 C (-11.9 F)
1975
-19.4 C (-2.9 F)
1976
-20.6 C (-5.1 F)
1977
-24.4 C (-11.9 F)
1978
-22.8 C (-9.0 F)
1979
-28.3 C (-18.9 F)
1980
-22.2 C (-8.0 F)
1981
-26.1 C (-15.0 F)
1982
-28.3 C (-18.9 F)
1983
-27.8 C (-18.0 F)
1984
-23.3 C (-9.9 F)
1985
-27.8 C (-18.0 F)
1986
-17.8 C (0.0 F)
1987
-17.8 C (0.0 F)
1988
-18.9 C (-2.0 F)
1990
-20.6 C (-5.1 F)
1991
-19.4 C (-2.9 F)
1992
-13.3 C (8.1 F)
1993
-23.3 C (-9.9 F)
1994
-18.3 C (-0.9 F)
1995
-22.8 C (-9.0 F)
1996
-26.7 C (-16.1 F)
1997
-27.8 C (-18.0 F)
1998
-16.7 C (1.9 F)
1999
-18.3 C (-0.9 F)
2000
-20.0 C (-4.0 F)
2001
-18.9 C (-2.0 F)
2002
-16.7 C (1.9 F)
2003
-20.0 C (-4.0 F)
2004
-17.8 C (0.0 F)
2005
-17.8 C (0.0 F)
2006
-17.2 C (1.0 F)
2007
-16.7 C (1.9 F)
2008
-21.7 C (-7.1 F)
2009
-17.2 C (1.0 F)
Wettest day (Rx1day)
The wettest day of the year at Windsor, 1893 to 2009. The record is 246.6 mm (9.7 in) in 1980, marked on the chart; the median year is 72.9 mm (2.9 in).
Wettest day (Rx1day) at Windsor by year
Year
Wettest day (Rx1day)
1893
87.4 mm (3.4 in)
1894
75.2 mm (3.0 in)
1895
69.1 mm (2.7 in)
1896
65.0 mm (2.6 in)
1897
74.2 mm (2.9 in)
1898
71.4 mm (2.8 in)
1899
48.0 mm (1.9 in)
1900
79.5 mm (3.1 in)
1901
51.3 mm (2.0 in)
1902
87.6 mm (3.4 in)
1903
54.9 mm (2.2 in)
1904
79.0 mm (3.1 in)
1905
74.7 mm (2.9 in)
1906
103.4 mm (4.1 in)
1907
62.0 mm (2.4 in)
1908
44.2 mm (1.7 in)
1948
68.3 mm (2.7 in)
1949
81.0 mm (3.2 in)
1950
67.6 mm (2.7 in)
1951
97.8 mm (3.9 in)
1952
61.5 mm (2.4 in)
1953
70.1 mm (2.8 in)
1954
82.6 mm (3.3 in)
1955
182.1 mm (7.2 in)
1956
125.7 mm (4.9 in)
1957
48.3 mm (1.9 in)
1958
66.8 mm (2.6 in)
1959
66.8 mm (2.6 in)
1960
57.2 mm (2.3 in)
1961
80.0 mm (3.1 in)
1962
31.8 mm (1.3 in)
1963
48.3 mm (1.9 in)
1964
69.6 mm (2.7 in)
1965
115.1 mm (4.5 in)
1966
66.0 mm (2.6 in)
1967
71.1 mm (2.8 in)
1968
63.0 mm (2.5 in)
1969
140.0 mm (5.5 in)
1970
94.5 mm (3.7 in)
1971
61.7 mm (2.4 in)
1972
70.9 mm (2.8 in)
1973
159.5 mm (6.3 in)
1974
62.2 mm (2.4 in)
1975
131.8 mm (5.2 in)
1976
78.2 mm (3.1 in)
1977
70.4 mm (2.8 in)
1978
106.7 mm (4.2 in)
1979
72.9 mm (2.9 in)
1980
246.6 mm (9.7 in)
1981
110.5 mm (4.4 in)
1982
97.0 mm (3.8 in)
1983
83.8 mm (3.3 in)
1984
64.8 mm (2.6 in)
1985
97.8 mm (3.9 in)
1986
113.5 mm (4.5 in)
1987
50.8 mm (2.0 in)
1988
48.3 mm (1.9 in)
1990
35.6 mm (1.4 in)
1991
50.8 mm (2.0 in)
1992
50.8 mm (2.0 in)
1993
106.7 mm (4.2 in)
1994
86.4 mm (3.4 in)
1995
79.5 mm (3.1 in)
1996
75.4 mm (3.0 in)
1997
90.2 mm (3.6 in)
1998
152.4 mm (6.0 in)
1999
101.6 mm (4.0 in)
2000
71.1 mm (2.8 in)
2001
65.5 mm (2.6 in)
2002
50.8 mm (2.0 in)
2003
93.2 mm (3.7 in)
2004
84.6 mm (3.3 in)
2005
50.8 mm (2.0 in)
2006
44.5 mm (1.8 in)
2007
57.2 mm (2.3 in)
2008
101.6 mm (4.0 in)
2009
109.7 mm (4.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Windsor, 1893 to 2009. The record is 277.9 mm (10.9 in) in 1986, marked on the chart; the median year is 121.2 mm (4.8 in).
Wettest five days (Rx5day) at Windsor by year
Year
Wettest five days (Rx5day)
1893
135.6 mm (5.3 in)
1894
100.3 mm (3.9 in)
1895
158.8 mm (6.3 in)
1896
114.4 mm (4.5 in)
1897
107.0 mm (4.2 in)
1898
133.1 mm (5.2 in)
1899
86.9 mm (3.4 in)
1900
105.2 mm (4.1 in)
1901
82.0 mm (3.2 in)
1902
115.1 mm (4.5 in)
1903
73.5 mm (2.9 in)
1904
131.1 mm (5.2 in)
1905
130.4 mm (5.1 in)
1906
112.0 mm (4.4 in)
1907
89.3 mm (3.5 in)
1908
72.1 mm (2.8 in)
1948
105.9 mm (4.2 in)
1949
149.6 mm (5.9 in)
1950
138.9 mm (5.5 in)
1951
188.5 mm (7.4 in)
1952
63.8 mm (2.5 in)
1953
87.9 mm (3.5 in)
1954
135.5 mm (5.3 in)
1955
182.1 mm (7.2 in)
1956
154.4 mm (6.1 in)
1957
110.5 mm (4.4 in)
1958
160.6 mm (6.3 in)
1959
101.5 mm (4.0 in)
1960
121.2 mm (4.8 in)
1961
132.8 mm (5.2 in)
1962
64.2 mm (2.5 in)
1963
71.9 mm (2.8 in)
1964
115.3 mm (4.5 in)
1965
146.1 mm (5.8 in)
1966
68.9 mm (2.7 in)
1967
115.9 mm (4.6 in)
1968
75.0 mm (3.0 in)
1969
198.7 mm (7.8 in)
1970
115.9 mm (4.6 in)
1971
90.4 mm (3.6 in)
1972
74.4 mm (2.9 in)
1973
196.1 mm (7.7 in)
1974
98.6 mm (3.9 in)
1975
138.9 mm (5.5 in)
1976
78.2 mm (3.1 in)
1977
125.5 mm (4.9 in)
1978
140.8 mm (5.5 in)
1979
124.2 mm (4.9 in)
1980
274.8 mm (10.8 in)
1981
202.0 mm (8.0 in)
1982
122.7 mm (4.8 in)
1983
132.3 mm (5.2 in)
1984
90.2 mm (3.6 in)
1985
117.1 mm (4.6 in)
1986
277.9 mm (10.9 in)
1987
67.8 mm (2.7 in)
1988
107.4 mm (4.2 in)
1990
54.1 mm (2.1 in)
1991
101.6 mm (4.0 in)
1992
141.8 mm (5.6 in)
1993
96.1 mm (3.8 in)
1994
162.6 mm (6.4 in)
1995
144.6 mm (5.7 in)
1996
137.2 mm (5.4 in)
1997
129.5 mm (5.1 in)
1998
175.0 mm (6.9 in)
1999
112.3 mm (4.4 in)
2000
137.9 mm (5.4 in)
2001
156.2 mm (6.1 in)
2002
116.1 mm (4.6 in)
2003
178.6 mm (7.0 in)
2004
120.5 mm (4.7 in)
2005
136.4 mm (5.4 in)
2006
70.9 mm (2.8 in)
2007
145.5 mm (5.7 in)
2008
173.4 mm (6.8 in)
2009
146.5 mm (5.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Windsor, 1893 to 2009. The record is 45 days in 1999, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Windsor by year
Year
Longest dry spell (CDD)
1893
31 days
1894
27 days
1895
29 days
1896
25 days
1897
16 days
1898
19 days
1899
28 days
1900
18 days
1901
38 days
1902
19 days
1903
12 days
1904
17 days
1905
30 days
1906
27 days
1907
11 days
1908
21 days
1948
24 days
1949
25 days
1950
35 days
1951
19 days
1952
24 days
1953
17 days
1954
21 days
1955
34 days
1956
37 days
1957
34 days
1958
25 days
1959
26 days
1960
28 days
1961
18 days
1962
22 days
1963
21 days
1964
29 days
1965
20 days
1966
29 days
1967
25 days
1968
16 days
1969
18 days
1970
27 days
1971
30 days
1972
29 days
1973
18 days
1974
22 days
1975
14 days
1976
29 days
1977
23 days
1978
22 days
1979
42 days
1980
22 days
1981
20 days
1982
19 days
1983
23 days
1984
38 days
1985
17 days
1986
23 days
1987
16 days
1988
19 days
1990
32 days
1991
34 days
1992
18 days
1993
14 days
1994
14 days
1995
23 days
1996
31 days
1997
16 days
1998
19 days
1999
45 days
2000
32 days
2001
18 days
2002
32 days
2003
28 days
2004
24 days
2005
23 days
2006
34 days
2007
26 days
2008
22 days
2009
16 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
55 years with a frost
Across 55 years with a frost, the median last spring frost at Windsor falls on 14 April and the median first autumn frost on 20 October, which leaves a median of 189 days between them.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
Frost dates and growing season at Windsor
Measure
Median, all years
Earliest period
Recent period (1970 to 2008)
Recent against earliest
Fitted trend
Last spring frost
14 April
n/a
11 April
n/a
-0.8 days per decade
First autumn frost
20 October
n/a
20 October
n/a
+0.7 days per decade
Growing days
189 days
n/a
193 days
n/a
+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
56 years, 1895 to 2008
A day with at least 76.0 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 235.9 mm (9.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Windsor: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
76.0 mm (3.0 in)
5 years
104.6 mm (4.1 in)
10 years
128.2 mm (5.0 in)
25 years
164.7 mm (6.5 in)
50 years
197.5 mm (7.8 in)
100 years
235.9 mm (9.3 in)
Longer than the 56 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, 56 years of values from 1895 to 2008.
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: 246.6 mm (9.7 in) in 1980; 182.1 mm (7.2 in) in 1955; 159.5 mm (6.3 in) in 1973.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Windsor, at 1975. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1975 ran 0.2 C (0.4 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Windsor, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1975
+0.2
+0.4
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 Windsor standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Windsor 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.