Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Windsor A. 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 A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-23.4 C (-10.1 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-9.5 C (14.9 F)
n/a
n/a
May
33.9 C (93.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jun
37.2 C (99.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
38.3 C (100.9 F)
5.6 C (42.1 F)
n/a
n/a
Aug
36.7 C (98.1 F)
5.2 C (41.4 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-5.0 C (23.0 F)
n/a
n/a
Nov
26.1 C (79.0 F)
-15.6 C (3.9 F)
n/a
n/a
Dec
18.3 C (64.9 F)
-23.4 C (-10.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Windsor A still stand. 1945 holds the most, with 62.
Standing records at Windsor A by the year they were set
Year set
Standing records
1940
15
1941
53
1942
49
1943
45
1944
40
1945
62
1946
49
1947
50
1948
29
1949
52
1950
55
1951
43
1952
36
1953
33
1954
35
1955
28
1956
30
1957
29
1958
25
1959
29
1960
23
1961
19
1962
37
1963
48
1964
37
1965
34
1966
25
1967
27
1968
25
1969
19
1970
16
1971
22
1972
30
1973
23
1974
25
1975
25
1976
33
1977
43
1978
15
1979
40
1980
11
1981
26
1982
39
1983
35
All-Time Record Progression
2 new records
2 all-time records were set at Windsor A between 15 January 1972 and 30 September 1981. Each dot is a new record.
When Windsor A set new all-time records
Date
Kind
Detail
1972-01-15
Record low maximum temperature
Record low maximum temperature -18.3 C (-0.9 F)
1981-09-30
Record daily precipitation
Record daily precipitation 89.0 mm (3.5 in)
Wettest Day of Each Month
Sep: 89.0 mm (3.5 in)
The wettest day on record for each calendar month at Windsor A. The most was 89.0 mm (3.5 in) on 30 September 1981.
Record daily precipitation for each month at Windsor A
Month
Record daily precipitation (mm)
Date
Jan
33.5 mm (1.3 in)
12 January 1960
Feb
36.6 mm (1.4 in)
25 February 1965
Mar
39.6 mm (1.6 in)
24 March 1954
Apr
64.8 mm (2.6 in)
30 April 1962
May
54.9 mm (2.2 in)
30 May 1953
Jun
78.0 mm (3.1 in)
25 June 1968
Jul
82.0 mm (3.2 in)
29 July 1983
Aug
67.3 mm (2.6 in)
30 August 1947
Sep
89.0 mm (3.5 in)
30 September 1981
Oct
71.6 mm (2.8 in)
11 October 1949
Nov
51.1 mm (2.0 in)
6 November 1951
Dec
72.6 mm (2.9 in)
21 December 1967
Period of Record Coverage
1940 to 1983
Complete yearUnder 90 percent of days
44 years of record at Windsor A, 1940 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1940.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Windsor A, 1941 to 1983. Blue stripes are years cooler than the station's own mean of 9.2 C (48.5 F); red stripes are warmer. The coolest year was 1963, at 8.4 C (47.0 F), and the warmest was 1949, at 10.6 C (51.0 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Windsor A as warming stripes, 1941 to 1983
Year
Annual mean temperature
Difference from the station mean
1941
10.4 C
+1.19 C
1942
9.2 C
+0.06 C
1943
8.5 C
-0.69 C
1944
9.6 C
+0.40 C
1945
8.7 C
-0.47 C
1946
10.2 C
+0.98 C
1947
9.1 C
-0.10 C
1948
9.3 C
+0.14 C
1949
10.6 C
+1.40 C
1950
8.6 C
-0.55 C
1951
8.9 C
-0.24 C
1952
10.1 C
+0.90 C
1953
10.4 C
+1.20 C
1954
9.7 C
+0.51 C
1955
10.2 C
+0.98 C
1956
9.1 C
-0.07 C
1957
9.1 C
-0.05 C
1958
8.7 C
-0.45 C
1959
9.4 C
+0.26 C
1960
8.8 C
-0.35 C
1961
9.1 C
-0.03 C
1962
8.7 C
-0.50 C
1963
8.4 C
-0.82 C
1964
9.3 C
+0.15 C
1965
8.6 C
-0.54 C
1966
8.6 C
-0.59 C
1967
8.4 C
-0.73 C
1968
8.9 C
-0.28 C
1969
8.7 C
-0.50 C
1970
9.0 C
-0.15 C
1971
9.6 C
+0.44 C
1972
8.5 C
-0.68 C
1973
10.2 C
+1.07 C
1974
9.0 C
-0.19 C
1975
9.8 C
+0.58 C
1976
8.6 C
-0.56 C
1977
9.2 C
-0.02 C
1978
8.4 C
-0.80 C
1979
8.5 C
-0.69 C
1980
8.7 C
-0.52 C
1981
9.1 C
-0.07 C
1982
8.9 C
-0.24 C
1983
9.6 C
+0.42 C
The annual mean temperature here has fallen by 0.16 C (0.01 to 0.31) per decade over 1941 to 1983. In Fahrenheit: 0.29 F (0.02 to 0.55) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Windsor A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.16 C (-0.31 to -0.01) per decade
-0.29 F (-0.55 to -0.02) per decade
1941 to 1983
43
Fall
Mean daily maximum
-0.15 C (-0.30 to 0.00) per decade
-0.27 F (-0.54 to 0.00) per decade
1941 to 1983
43
Not clearly different from zero
Mean daily minimum
-0.17 C (-0.33 to -0.01) per decade
-0.30 F (-0.59 to -0.02) per decade
1941 to 1983
43
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
1940 to 1983
Yearly extremes at Windsor A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1941
34.8 C (94.6 F)
44
Coldest night (TNn)
-26.1 C (-15.0 F)
1963
-20.6 C (-5.1 F)
44
Wettest day (Rx1day)
89.0 mm (3.5 in)
1981
46.6 mm (1.8 in)
44
Wettest five days (Rx5day)
132.4 mm (5.2 in)
1957
79.7 mm (3.1 in)
44
Longest dry spell (CDD)
40 days
1963
17 days
44
Hottest day (TXx)
The hottest day of the year at Windsor A, 1940 to 1983. The record is 38.3 C (100.9 F) in 1941, marked on the chart; the median year is 34.8 C (94.6 F).
Hottest day (TXx) at Windsor A by year
Year
Hottest day (TXx)
1940
33.3 C (91.9 F)
1941
38.3 C (100.9 F)
1942
35.6 C (96.1 F)
1943
35.0 C (95.0 F)
1944
36.7 C (98.1 F)
1945
32.8 C (91.0 F)
1946
36.7 C (98.1 F)
1947
35.0 C (95.0 F)
1948
35.6 C (96.1 F)
1949
35.6 C (96.1 F)
1950
33.9 C (93.0 F)
1951
33.9 C (93.0 F)
1952
37.2 C (99.0 F)
1953
37.2 C (99.0 F)
1954
37.2 C (99.0 F)
1955
36.7 C (98.1 F)
1956
34.4 C (93.9 F)
1957
33.9 C (93.0 F)
1958
32.2 C (90.0 F)
1959
33.3 C (91.9 F)
1960
33.3 C (91.9 F)
1961
33.9 C (93.0 F)
1962
33.9 C (93.0 F)
1963
33.9 C (93.0 F)
1964
34.4 C (93.9 F)
1965
35.6 C (96.1 F)
1966
36.1 C (97.0 F)
1967
33.9 C (93.0 F)
1968
33.3 C (91.9 F)
1969
32.8 C (91.0 F)
1970
33.9 C (93.0 F)
1971
37.2 C (99.0 F)
1972
35.0 C (95.0 F)
1973
35.6 C (96.1 F)
1974
35.6 C (96.1 F)
1975
35.6 C (96.1 F)
1976
35.0 C (95.0 F)
1977
35.7 C (96.3 F)
1978
36.5 C (97.7 F)
1979
33.9 C (93.0 F)
1980
34.0 C (93.2 F)
1981
34.2 C (93.6 F)
1982
33.4 C (92.1 F)
1983
34.6 C (94.3 F)
Coldest night (TNn)
The coldest night of the year at Windsor A, 1940 to 1983. The record is -26.1 C (-15.0 F) in 1963, marked on the chart; the median year is -20.6 C (-5.1 F).
Coldest night (TNn) at Windsor A by year
Year
Coldest night (TNn)
1940
-15.0 C (5.0 F)
1941
-15.0 C (5.0 F)
1942
-21.1 C (-6.0 F)
1943
-22.8 C (-9.0 F)
1944
-20.6 C (-5.1 F)
1945
-20.0 C (-4.0 F)
1946
-17.8 C (0.0 F)
1947
-17.8 C (0.0 F)
1948
-20.0 C (-4.0 F)
1949
-15.0 C (5.0 F)
1950
-21.1 C (-6.0 F)
1951
-22.2 C (-8.0 F)
1952
-12.2 C (10.0 F)
1953
-15.0 C (5.0 F)
1954
-15.0 C (5.0 F)
1955
-17.2 C (1.0 F)
1956
-15.6 C (3.9 F)
1957
-20.6 C (-5.1 F)
1958
-21.7 C (-7.1 F)
1959
-20.0 C (-4.0 F)
1960
-23.3 C (-9.9 F)
1961
-21.7 C (-7.1 F)
1962
-20.6 C (-5.1 F)
1963
-26.1 C (-15.0 F)
1964
-16.7 C (1.9 F)
1965
-20.6 C (-5.1 F)
1966
-20.6 C (-5.1 F)
1967
-18.3 C (-0.9 F)
1968
-20.6 C (-5.1 F)
1969
-20.0 C (-4.0 F)
1970
-23.3 C (-9.9 F)
1971
-21.7 C (-7.1 F)
1972
-25.0 C (-13.0 F)
1973
-20.0 C (-4.0 F)
1974
-19.4 C (-2.9 F)
1975
-19.4 C (-2.9 F)
1976
-21.1 C (-6.0 F)
1977
-23.6 C (-10.5 F)
1978
-21.0 C (-5.8 F)
1979
-21.6 C (-6.9 F)
1980
-18.3 C (-0.9 F)
1981
-20.8 C (-5.4 F)
1982
-25.7 C (-14.3 F)
1983
-23.4 C (-10.1 F)
Wettest day (Rx1day)
The wettest day of the year at Windsor A, 1940 to 1983. The record is 89.0 mm (3.5 in) in 1981, marked on the chart; the median year is 46.6 mm (1.8 in).
Wettest day (Rx1day) at Windsor A by year
Year
Wettest day (Rx1day)
1940
53.6 mm (2.1 in)
1941
44.7 mm (1.8 in)
1942
43.4 mm (1.7 in)
1943
42.9 mm (1.7 in)
1944
20.3 mm (0.8 in)
1945
37.1 mm (1.5 in)
1946
49.3 mm (1.9 in)
1947
67.3 mm (2.6 in)
1948
33.3 mm (1.3 in)
1949
71.6 mm (2.8 in)
1950
46.2 mm (1.8 in)
1951
51.1 mm (2.0 in)
1952
47.0 mm (1.9 in)
1953
54.9 mm (2.2 in)
1954
67.3 mm (2.6 in)
1955
40.4 mm (1.6 in)
1956
41.4 mm (1.6 in)
1957
68.6 mm (2.7 in)
1958
40.1 mm (1.6 in)
1959
42.7 mm (1.7 in)
1960
52.8 mm (2.1 in)
1961
43.9 mm (1.7 in)
1962
64.8 mm (2.6 in)
1963
53.1 mm (2.1 in)
1964
39.4 mm (1.6 in)
1965
50.3 mm (2.0 in)
1966
67.3 mm (2.6 in)
1967
72.6 mm (2.9 in)
1968
78.0 mm (3.1 in)
1969
49.3 mm (1.9 in)
1970
29.7 mm (1.2 in)
1971
43.9 mm (1.7 in)
1972
31.2 mm (1.2 in)
1973
39.6 mm (1.6 in)
1974
49.8 mm (2.0 in)
1975
35.8 mm (1.4 in)
1976
34.8 mm (1.4 in)
1977
42.9 mm (1.7 in)
1978
29.3 mm (1.2 in)
1979
61.2 mm (2.4 in)
1980
50.8 mm (2.0 in)
1981
89.0 mm (3.5 in)
1982
37.2 mm (1.5 in)
1983
82.0 mm (3.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Windsor A, 1940 to 1983. The record is 132.4 mm (5.2 in) in 1957, marked on the chart; the median year is 79.7 mm (3.1 in).
Wettest five days (Rx5day) at Windsor A by year
Year
Wettest five days (Rx5day)
1940
79.5 mm (3.1 in)
1941
64.6 mm (2.5 in)
1942
57.2 mm (2.3 in)
1943
72.1 mm (2.8 in)
1944
42.4 mm (1.7 in)
1945
81.5 mm (3.2 in)
1946
110.8 mm (4.4 in)
1947
109.8 mm (4.3 in)
1948
92.0 mm (3.6 in)
1949
72.8 mm (2.9 in)
1950
83.8 mm (3.3 in)
1951
62.1 mm (2.4 in)
1952
71.1 mm (2.8 in)
1953
65.0 mm (2.6 in)
1954
95.0 mm (3.7 in)
1955
64.0 mm (2.5 in)
1956
79.8 mm (3.1 in)
1957
132.4 mm (5.2 in)
1958
59.7 mm (2.4 in)
1959
84.3 mm (3.3 in)
1960
112.2 mm (4.4 in)
1961
69.6 mm (2.7 in)
1962
83.1 mm (3.3 in)
1963
112.3 mm (4.4 in)
1964
65.3 mm (2.6 in)
1965
83.6 mm (3.3 in)
1966
80.4 mm (3.2 in)
1967
83.5 mm (3.3 in)
1968
116.4 mm (4.6 in)
1969
108.3 mm (4.3 in)
1970
43.4 mm (1.7 in)
1971
43.9 mm (1.7 in)
1972
77.1 mm (3.0 in)
1973
77.5 mm (3.1 in)
1974
51.1 mm (2.0 in)
1975
84.9 mm (3.3 in)
1976
65.0 mm (2.6 in)
1977
99.9 mm (3.9 in)
1978
48.7 mm (1.9 in)
1979
69.4 mm (2.7 in)
1980
94.8 mm (3.7 in)
1981
93.8 mm (3.7 in)
1982
79.6 mm (3.1 in)
1983
96.7 mm (3.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Windsor A, 1940 to 1983. The record is 40 days in 1963, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Windsor A by year
Year
Longest dry spell (CDD)
1940
11 days
1941
14 days
1942
16 days
1943
18 days
1944
31 days
1945
15 days
1946
17 days
1947
17 days
1948
18 days
1949
21 days
1950
13 days
1951
14 days
1952
14 days
1953
20 days
1954
22 days
1955
17 days
1956
13 days
1957
22 days
1958
15 days
1959
19 days
1960
13 days
1961
18 days
1962
19 days
1963
40 days
1964
13 days
1965
15 days
1966
17 days
1967
23 days
1968
17 days
1969
30 days
1970
11 days
1971
18 days
1972
13 days
1973
27 days
1974
16 days
1975
14 days
1976
26 days
1977
15 days
1978
17 days
1979
16 days
1980
14 days
1981
15 days
1982
16 days
1983
18 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Windsor A falls on 27 April and the median first autumn frost on 21 October, which leaves a median of 176 days between them.
Fitted over all years, the growing season changes by +2.9 days per decade at this station.
Frost dates and growing season at Windsor A
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
27 April
n/a
27 April
n/a
-1.7 days per decade
First autumn frost
21 October
n/a
22 October
n/a
+1.2 days per decade
Growing days
176 days
n/a
178 days
n/a
+2.9 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
43 years, 1941 to 1983
A day with at least 47.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 98.9 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Windsor A: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
47.2 mm (1.9 in)
5 years
61.2 mm (2.4 in)
10 years
70.4 mm (2.8 in)
25 years
81.9 mm (3.2 in)
50 years
90.5 mm (3.6 in)
Longer than the 43 years of record
100 years
98.9 mm (3.9 in)
Longer than the 43 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, 43 years of values from 1941 to 1983.
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: 89.0 mm (3.5 in) in 1981; 82.0 mm (3.2 in) in 1983; 78.0 mm (3.1 in) in 1968.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Windsor A, at 1961 and 1971. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1961 ran 0.1 C (0.2 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1971 ran 0.3 C (0.5 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Windsor A, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1961
-0.1
-0.2
possible
5
1971
+0.3
+0.5
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 A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Windsor A 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.