Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Windsor Riverside. 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 Riverside, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-32.8 C (-27.0 F)
n/a
n/a
Feb
17.8 C (64.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-13.3 C (8.1 F)
n/a
n/a
May
35.0 C (95.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
36.7 C (98.1 F)
2.8 C (37.0 F)
n/a
n/a
Jul
37.8 C (100.0 F)
4.4 C (39.9 F)
n/a
n/a
Aug
37.8 C (100.0 F)
5.0 C (41.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Windsor Riverside still stand. 1880 holds the most, with 58.
Standing records at Windsor Riverside by the year they were set
Year set
Standing records
1866
21
1867
32
1868
30
1869
35
1870
23
1871
48
1872
36
1873
28
1874
37
1875
43
1876
44
1877
35
1878
19
1879
51
1880
58
1881
39
1882
34
1883
34
1884
39
1885
48
1886
34
1887
28
1896
26
1897
21
1898
31
1899
43
1900
33
1901
18
1902
20
1903
25
1904
17
1905
13
1906
22
1907
18
1908
20
1909
16
1910
19
1911
26
1912
24
1913
30
1914
19
1915
30
1916
27
1917
4
1920
1
1921
14
1924
17
1925
38
1926
17
1927
20
1928
31
1929
28
All-Time Record Progression
3 new records
3 all-time records were set at Windsor Riverside between 4 July 1911 and 31 July 1925. Each dot is a new record.
When Windsor Riverside set new all-time records
Date
Kind
Detail
1911-07-04
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
1916-08-22
Record high minimum temperature
Record high minimum temperature 26.1 C (79.0 F)
1925-07-31
Record daily precipitation
Record daily precipitation 113.0 mm (4.4 in)
Wettest Day of Each Month
Jul: 113.0 mm (4.4 in)
The wettest day on record for each calendar month at Windsor Riverside. The most was 113.0 mm (4.4 in) on 31 July 1925.
Record daily precipitation for each month at Windsor Riverside
Month
Record daily precipitation (mm)
Date
Jan
40.6 mm (1.6 in)
24 January 1873
Feb
40.1 mm (1.6 in)
7 February 1887
Mar
40.1 mm (1.6 in)
24 March 1913
Apr
42.7 mm (1.7 in)
30 April 1909
May
48.8 mm (1.9 in)
27 May 1882
Jun
81.5 mm (3.2 in)
6 June 1905
Jul
113.0 mm (4.4 in)
31 July 1925
Aug
87.6 mm (3.4 in)
17 August 1926
Sep
46.5 mm (1.8 in)
29 September 1896
Oct
43.2 mm (1.7 in)
19 October 1877
Nov
50.8 mm (2.0 in)
23 November 1909
Dec
49.0 mm (1.9 in)
14 December 1901
Period of Record Coverage
1866 to 1929
Complete yearUnder 90 percent of days
52 years of record at Windsor Riverside, 1866 to 1929. 28 years have data for under 90 percent of days and are left out of rankings: 1866, 1867, 1868, 1869, 1870, 1871, 1872, 1873 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Windsor Riverside, 1867 to 1928. Blue stripes are years cooler than the station's own mean of 8.8 C (47.9 F); red stripes are warmer. The coolest year was 1885, at 7.0 C (44.6 F), and the warmest was 1928, at 10.1 C (50.1 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Windsor Riverside as warming stripes, 1867 to 1928
Year
Annual mean temperature
Difference from the station mean
1867
8.5 C
-0.34 C
1869
7.9 C
-0.96 C
1870
9.3 C
+0.51 C
1871
8.7 C
-0.09 C
1872
7.7 C
-1.11 C
1873
8.0 C
-0.78 C
1874
8.9 C
+0.11 C
1876
8.4 C
-0.39 C
1877
9.4 C
+0.54 C
1878
9.9 C
+1.07 C
1879
8.8 C
+0.02 C
1880
9.5 C
+0.64 C
1881
9.2 C
+0.39 C
1882
9.0 C
+0.17 C
1883
7.6 C
-1.19 C
1884
8.5 C
-0.35 C
1885
7.0 C
-1.83 C
1886
8.5 C
-0.36 C
1887
8.5 C
-0.32 C
1898
10.0 C
+1.21 C
1899
9.2 C
+0.37 C
1900
9.4 C
+0.61 C
1901
8.5 C
-0.36 C
1902
9.0 C
+0.21 C
1903
8.8 C
0.00 C
1904
7.4 C
-1.39 C
1905
8.3 C
-0.48 C
1906
9.7 C
+0.84 C
1907
7.9 C
-0.94 C
1908
9.3 C
+0.49 C
1909
8.9 C
+0.06 C
1910
8.8 C
-0.04 C
1911
9.9 C
+1.11 C
1912
8.0 C
-0.81 C
1913
9.6 C
+0.78 C
1914
8.8 C
0.00 C
1915
9.0 C
+0.15 C
1916
9.1 C
+0.32 C
1925
9.2 C
+0.34 C
1926
8.4 C
-0.37 C
1927
9.9 C
+1.11 C
1928
10.1 C
+1.25 C
The fitted trend in annual mean temperature here over 1867 to 1928 is 0.12 C (0.00 to 0.24) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.22 F (0.00 to 0.44) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Windsor Riverside
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.12 C (0.00 to 0.24) per decade
0.22 F (0.00 to 0.44) per decade
1867 to 1928
42
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.5 to 0.1) per decade
1867 to 1928
42
Not clearly different from zero
Mean daily minimum
0.3 C (0.2 to 0.5) per decade
0.6 F (0.4 to 0.9) per decade
1867 to 1928
42
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
1866 to 1929
Yearly extremes at Windsor Riverside: 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)
1881
34.4 C (93.9 F)
52
Coldest night (TNn)
-32.8 C (-27.0 F)
1873
-21.4 C (-6.5 F)
52
Wettest day (Rx1day)
113.0 mm (4.4 in)
1925
39.9 mm (1.6 in)
52
Wettest five days (Rx5day)
126.3 mm (5.0 in)
1902
67.8 mm (2.7 in)
52
Longest dry spell (CDD)
41 days
1908
18 days
52
Hottest day (TXx)
The hottest day of the year at Windsor Riverside, 1866 to 1929. The record is 38.3 C (100.9 F) in 1881, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Windsor Riverside by year
Year
Hottest day (TXx)
1866
35.0 C (95.0 F)
1867
33.9 C (93.0 F)
1868
37.2 C (99.0 F)
1869
33.3 C (91.9 F)
1870
35.6 C (96.1 F)
1871
37.2 C (99.0 F)
1872
36.1 C (97.0 F)
1873
35.0 C (95.0 F)
1874
37.8 C (100.0 F)
1875
32.8 C (91.0 F)
1876
34.4 C (93.9 F)
1877
34.4 C (93.9 F)
1878
36.7 C (98.1 F)
1879
35.0 C (95.0 F)
1880
35.0 C (95.0 F)
1881
38.3 C (100.9 F)
1882
32.2 C (90.0 F)
1883
34.4 C (93.9 F)
1884
34.4 C (93.9 F)
1885
33.9 C (93.0 F)
1886
35.0 C (95.0 F)
1887
37.2 C (99.0 F)
1896
32.8 C (91.0 F)
1897
35.6 C (96.1 F)
1898
37.8 C (100.0 F)
1899
35.0 C (95.0 F)
1900
33.3 C (91.9 F)
1901
32.8 C (91.0 F)
1902
31.1 C (88.0 F)
1903
32.2 C (90.0 F)
1904
35.6 C (96.1 F)
1905
31.1 C (88.0 F)
1906
32.8 C (91.0 F)
1907
30.0 C (86.0 F)
1908
33.9 C (93.0 F)
1909
33.3 C (91.9 F)
1910
33.9 C (93.0 F)
1911
37.8 C (100.0 F)
1912
32.2 C (90.0 F)
1913
33.9 C (93.0 F)
1914
32.8 C (91.0 F)
1915
30.6 C (87.1 F)
1916
36.7 C (98.1 F)
1917
27.2 C (81.0 F)
1920
18.3 C (64.9 F)
1921
26.1 C (79.0 F)
1924
35.6 C (96.1 F)
1925
36.7 C (98.1 F)
1926
37.8 C (100.0 F)
1927
35.6 C (96.1 F)
1928
36.1 C (97.0 F)
1929
36.1 C (97.0 F)
Coldest night (TNn)
The coldest night of the year at Windsor Riverside, 1866 to 1929. The record is -32.8 C (-27.0 F) in 1873, marked on the chart; the median year is -21.4 C (-6.5 F).
Coldest night (TNn) at Windsor Riverside by year
Year
Coldest night (TNn)
1866
-17.8 C (0.0 F)
1867
-29.4 C (-20.9 F)
1868
-29.4 C (-20.9 F)
1869
-18.3 C (-0.9 F)
1870
-21.7 C (-7.1 F)
1871
-28.3 C (-18.9 F)
1872
-29.4 C (-20.9 F)
1873
-32.8 C (-27.0 F)
1874
-20.0 C (-4.0 F)
1875
-28.9 C (-20.0 F)
1876
-26.1 C (-15.0 F)
1877
-22.8 C (-9.0 F)
1878
-21.1 C (-6.0 F)
1879
-25.0 C (-13.0 F)
1880
-23.9 C (-11.0 F)
1881
-21.7 C (-7.1 F)
1882
-18.9 C (-2.0 F)
1883
-24.4 C (-11.9 F)
1884
-25.0 C (-13.0 F)
1885
-29.4 C (-20.9 F)
1886
-23.9 C (-11.0 F)
1887
-23.3 C (-9.9 F)
1896
-16.1 C (3.0 F)
1897
-25.6 C (-14.1 F)
1898
-19.4 C (-2.9 F)
1899
-23.9 C (-11.0 F)
1900
-19.4 C (-2.9 F)
1901
-20.0 C (-4.0 F)
1902
-18.9 C (-2.0 F)
1903
-20.6 C (-5.1 F)
1904
-22.2 C (-8.0 F)
1905
-24.4 C (-11.9 F)
1906
-18.3 C (-0.9 F)
1907
-19.4 C (-2.9 F)
1908
-18.3 C (-0.9 F)
1909
-17.8 C (0.0 F)
1910
-16.1 C (3.0 F)
1911
-15.0 C (5.0 F)
1912
-24.4 C (-11.9 F)
1913
-17.2 C (1.0 F)
1914
-22.8 C (-9.0 F)
1915
-21.1 C (-6.0 F)
1916
-17.2 C (1.0 F)
1917
-24.4 C (-11.9 F)
1920
-7.2 C (19.0 F)
1921
-12.8 C (9.0 F)
1924
-22.2 C (-8.0 F)
1925
-20.6 C (-5.1 F)
1926
-18.3 C (-0.9 F)
1927
-16.7 C (1.9 F)
1928
-18.3 C (-0.9 F)
1929
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Windsor Riverside, 1866 to 1929. The record is 113.0 mm (4.4 in) in 1925, marked on the chart; the median year is 39.9 mm (1.6 in).
Wettest day (Rx1day) at Windsor Riverside by year
Year
Wettest day (Rx1day)
1866
25.1 mm (1.0 in)
1867
28.2 mm (1.1 in)
1868
64.8 mm (2.6 in)
1869
39.9 mm (1.6 in)
1870
38.1 mm (1.5 in)
1871
34.5 mm (1.4 in)
1872
30.7 mm (1.2 in)
1873
46.2 mm (1.8 in)
1874
49.3 mm (1.9 in)
1875
30.7 mm (1.2 in)
1876
34.0 mm (1.3 in)
1877
43.2 mm (1.7 in)
1878
31.0 mm (1.2 in)
1879
91.7 mm (3.6 in)
1880
42.7 mm (1.7 in)
1881
34.0 mm (1.3 in)
1882
48.8 mm (1.9 in)
1883
39.9 mm (1.6 in)
1884
27.7 mm (1.1 in)
1885
38.1 mm (1.5 in)
1886
76.2 mm (3.0 in)
1887
40.1 mm (1.6 in)
1896
75.4 mm (3.0 in)
1897
34.0 mm (1.3 in)
1898
35.1 mm (1.4 in)
1899
36.6 mm (1.4 in)
1900
36.3 mm (1.4 in)
1901
49.0 mm (1.9 in)
1902
64.3 mm (2.5 in)
1903
60.5 mm (2.4 in)
1904
38.1 mm (1.5 in)
1905
81.5 mm (3.2 in)
1906
52.6 mm (2.1 in)
1907
36.6 mm (1.4 in)
1908
54.9 mm (2.2 in)
1909
89.9 mm (3.5 in)
1910
33.3 mm (1.3 in)
1911
40.1 mm (1.6 in)
1912
65.0 mm (2.6 in)
1913
40.1 mm (1.6 in)
1914
48.5 mm (1.9 in)
1915
48.5 mm (1.9 in)
1916
44.7 mm (1.8 in)
1917
22.4 mm (0.9 in)
1920
16.8 mm (0.7 in)
1921
12.7 mm (0.5 in)
1924
31.5 mm (1.2 in)
1925
113.0 mm (4.4 in)
1926
87.6 mm (3.4 in)
1927
30.5 mm (1.2 in)
1928
27.9 mm (1.1 in)
1929
38.1 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Windsor Riverside, 1866 to 1929. The record is 126.3 mm (5.0 in) in 1902, marked on the chart; the median year is 67.8 mm (2.7 in).
Wettest five days (Rx5day) at Windsor Riverside by year
Year
Wettest five days (Rx5day)
1866
44.7 mm (1.8 in)
1867
54.8 mm (2.2 in)
1868
72.7 mm (2.9 in)
1869
80.0 mm (3.1 in)
1870
61.3 mm (2.4 in)
1871
45.2 mm (1.8 in)
1872
52.8 mm (2.1 in)
1873
70.3 mm (2.8 in)
1874
76.8 mm (3.0 in)
1875
76.0 mm (3.0 in)
1876
67.5 mm (2.7 in)
1877
74.4 mm (2.9 in)
1878
40.4 mm (1.6 in)
1879
94.5 mm (3.7 in)
1880
57.4 mm (2.3 in)
1881
50.0 mm (2.0 in)
1882
62.5 mm (2.5 in)
1883
68.1 mm (2.7 in)
1884
55.9 mm (2.2 in)
1885
53.8 mm (2.1 in)
1886
81.0 mm (3.2 in)
1887
84.9 mm (3.3 in)
1896
93.5 mm (3.7 in)
1897
48.8 mm (1.9 in)
1898
85.9 mm (3.4 in)
1899
53.1 mm (2.1 in)
1900
64.7 mm (2.5 in)
1901
82.8 mm (3.3 in)
1902
126.3 mm (5.0 in)
1903
96.0 mm (3.8 in)
1904
56.2 mm (2.2 in)
1905
90.4 mm (3.6 in)
1906
71.4 mm (2.8 in)
1907
52.6 mm (2.1 in)
1908
74.7 mm (2.9 in)
1909
116.1 mm (4.6 in)
1910
65.5 mm (2.6 in)
1911
72.4 mm (2.9 in)
1912
67.5 mm (2.7 in)
1913
96.2 mm (3.8 in)
1914
100.3 mm (3.9 in)
1915
86.9 mm (3.4 in)
1916
51.5 mm (2.0 in)
1917
63.5 mm (2.5 in)
1920
20.1 mm (0.8 in)
1921
20.0 mm (0.8 in)
1924
49.5 mm (1.9 in)
1925
119.0 mm (4.7 in)
1926
92.2 mm (3.6 in)
1927
77.2 mm (3.0 in)
1928
47.5 mm (1.9 in)
1929
66.3 mm (2.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Windsor Riverside, 1866 to 1929. The record is 41 days in 1908, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Windsor Riverside by year
Year
Longest dry spell (CDD)
1866
22 days
1867
17 days
1868
28 days
1869
20 days
1870
14 days
1871
21 days
1872
17 days
1873
15 days
1874
17 days
1875
22 days
1876
11 days
1877
18 days
1878
15 days
1879
18 days
1880
16 days
1881
22 days
1882
18 days
1883
12 days
1884
17 days
1885
18 days
1886
17 days
1887
19 days
1896
11 days
1897
24 days
1898
16 days
1899
22 days
1900
19 days
1901
19 days
1902
17 days
1903
25 days
1904
28 days
1905
28 days
1906
29 days
1907
18 days
1908
41 days
1909
16 days
1910
28 days
1911
15 days
1912
18 days
1913
16 days
1914
23 days
1915
17 days
1916
32 days
1917
12 days
1920
8 days
1921
13 days
1924
38 days
1925
25 days
1926
18 days
1927
20 days
1928
16 days
1929
15 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Windsor Riverside falls on 30 April and the median first autumn frost on 16 October, which leaves a median of 170 days between them.
Fitted over all years, the growing season changes by +3.9 days per decade at this station.
Frost dates and growing season at Windsor Riverside
Measure
Median, all years
Earliest period
Recent period (1881 to 1928)
Recent against earliest
Fitted trend
Last spring frost
30 April
n/a
29 April
n/a
-1.4 days per decade
First autumn frost
16 October
n/a
20 October
n/a
+2.5 days per decade
Growing days
170 days
n/a
173 days
n/a
+3.9 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
44 years, 1867 to 1928
A day with at least 42.5 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 135.9 mm (5.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Windsor Riverside: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
42.5 mm (1.7 in)
5 years
58.1 mm (2.3 in)
10 years
71.4 mm (2.8 in)
25 years
92.6 mm (3.6 in)
50 years
112.3 mm (4.4 in)
Longer than the 44 years of record
100 years
135.9 mm (5.4 in)
Longer than the 44 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, 44 years of values from 1867 to 1928.
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: 113.0 mm (4.4 in) in 1925; 91.7 mm (3.6 in) in 1879; 89.9 mm (3.5 in) in 1909.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Windsor Riverside, at 1902. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1902 ran 0.2 C (0.4 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Windsor Riverside, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1902
+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 Riverside standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Windsor Riverside 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.