Windsor Riverside Weather Records (CA006139520)
Record envelope, standing records and threshold days for Windsor Riverside (CA006139520), Ontario, Canada, with 159 years of record.
Key Facts for Windsor Riverside
- Windsor Riverside (CA006139520) is a weather station in Ontario, Canada at 42.33 latitude and -82.93 longitude, 188 m (617 ft) above sea level.
- The station reports from 1866 to 2024, 159 years of record.
- 1,464 records set at Windsor Riverside still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Windsor Riverside set a daily record high maximum temperature of 34.4 C (93.9 F) on 26 August 1929.
About the Station
- Location: Ontario, Canada, 42.33 latitude, -82.93 longitude.
- Elevation: 188 m (617 ft).
- Period of record: 1866 to 2024, 159 years.
- Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record| 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 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| 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)| 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| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1866 | 183 | 50% | No |
| 1867 | 313 | 86% | No |
| 1868 | 293 | 80% | No |
| 1869 | 307 | 84% | No |
| 1870 | 313 | 86% | No |
| 1871 | 312 | 85% | No |
| 1872 | 314 | 86% | No |
| 1873 | 313 | 86% | No |
| 1874 | 313 | 86% | No |
| 1875 | 261 | 72% | No |
| 1876 | 313 | 86% | No |
| 1877 | 313 | 86% | No |
| 1878 | 313 | 86% | No |
| 1879 | 312 | 85% | No |
| 1880 | 314 | 86% | No |
| 1881 | 313 | 86% | No |
| 1882 | 312 | 85% | No |
| 1883 | 313 | 86% | No |
| 1884 | 314 | 86% | No |
| 1885 | 313 | 86% | No |
| 1886 | 313 | 86% | No |
| 1887 | 313 | 86% | No |
| 1896 | 180 | 49% | No |
| 1897 | 349 | 96% | Yes |
| 1898 | 363 | 99% | Yes |
| 1899 | 359 | 98% | Yes |
| 1900 | 360 | 99% | Yes |
| 1901 | 359 | 98% | Yes |
| 1902 | 352 | 96% | Yes |
| 1903 | 352 | 96% | Yes |
| 1904 | 365 | 100% | Yes |
| 1905 | 363 | 99% | Yes |
| 1906 | 364 | 100% | Yes |
| 1907 | 364 | 100% | Yes |
| 1908 | 361 | 99% | Yes |
| 1909 | 364 | 100% | Yes |
| 1910 | 363 | 99% | Yes |
| 1911 | 364 | 100% | Yes |
| 1912 | 366 | 100% | Yes |
| 1913 | 365 | 100% | Yes |
| 1914 | 365 | 100% | Yes |
| 1915 | 365 | 100% | Yes |
| 1916 | 365 | 100% | Yes |
| 1917 | 151 | 41% | No |
| 1920 | 30 | 8% | No |
| 1921 | 73 | 20% | No |
| 1924 | 165 | 45% | No |
| 1925 | 364 | 100% | Yes |
| 1926 | 364 | 100% | Yes |
| 1927 | 365 | 100% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 243 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 26 August 1929 | Windsor Riverside, CA | daily high max | 34.4 C (93.9 F) | 1.1 C (2.0 F) | 20 years | 14 of 100 (Routine) |
| 25 August 1929 | Windsor Riverside, CA | daily high max | 33.9 C (93.0 F) | 1.7 C (3.1 F) | 59 years | 27 of 100 (Routine) |
| 23 August 1929 | Windsor Riverside, CA | daily high min (Tie) | 22.2 C (72.0 F) | tie | 30 years | 3 of 100 (Routine) |
| 11 August 1929 | Windsor Riverside, CA | daily high max | 35.6 C (96.1 F) | 1.7 C (3.1 F) | 42 years | 22 of 100 (Routine) |
| 29 July 1929 | Windsor Riverside, CA | daily high max (Tie) | 33.9 C (93.0 F) | tie | 42 years | 4 of 100 (Routine) |
| 28 July 1929 | Windsor Riverside, CA | monthly high min (Tie) | 25.6 C (78.1 F) | tie | 18 years | 5 of 100 (Routine) |
| 27 July 1929 | Windsor Riverside, CA | daily high max | 35.6 C (96.1 F) | 0.6 C (1.1 F) | 41 years | 19 of 100 (Routine) |
| 27 July 1929 | Windsor Riverside, CA | daily high min | 24.4 C (75.9 F) | 1.1 C (2.0 F) | 12 years | 12 of 100 (Routine) |
| 25 July 1929 | Windsor Riverside, CA | daily high max | 32.8 C (91.0 F) | 0.6 C (1.1 F) | 55 years | 23 of 100 (Routine) |
| 23 July 1929 | Windsor Riverside, CA | daily high max | 35.0 C (95.0 F) | 0.6 C (1.1 F) | 30 years | 16 of 100 (Routine) |
| 22 July 1929 | Windsor Riverside, CA | daily high max (Tie) | 33.3 C (91.9 F) | tie | 61 years | 6 of 100 (Routine) |
| 19 June 1929 | Windsor Riverside, CA | daily high min | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 24 years | 14 of 100 (Routine) |
| 18 June 1929 | Windsor Riverside, CA | daily high max | 33.9 C (93.0 F) | 1.7 C (3.1 F) | 60 years | 27 of 100 (Routine) |
| 16 June 1929 | Windsor Riverside, CA | daily high min | 21.1 C (70.0 F) | 1.1 C (2.0 F) | 52 years | 23 of 100 (Routine) |
| 6 June 1929 | Windsor Riverside, CA | daily low min (Tie) | 5.6 C (42.1 F) | tie | 46 years | 5 of 100 (Routine) |
| 30 May 1929 | Windsor Riverside, CA | daily high max | 33.3 C (91.9 F) | 0.5 C (0.9 F) | 54 years | 22 of 100 (Routine) |
| 30 May 1929 | Windsor Riverside, CA | daily high min (Tie) | 19.4 C (66.9 F) | tie | 57 years | 5 of 100 (Routine) |
| 29 May 1929 | Windsor Riverside, CA | daily high min | 18.3 C (64.9 F) | 1.1 C (2.0 F) | 29 years | 16 of 100 (Routine) |
| 29 May 1929 | Windsor Riverside, CA | daily high max (Tie) | 33.9 C (93.0 F) | tie | 57 years | 5 of 100 (Routine) |
| 28 May 1929 | Windsor Riverside, CA | daily high min (Tie) | 18.3 C (64.9 F) | tie | 18 years | 2 of 100 (Routine) |
Climate Trend
42 complete years, 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.
| 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| 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)
| 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)
| 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)
| 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)
| 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)
| 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 frostAcross 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.
| 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 1928A 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.
| 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 suspectedOne 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).
| 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
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-17).