General Wayne A Downing Intl A Weather Records (USW00014842)

The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1944 to 2025. In Fahrenheit: 0.4 F (0.2 to 0.5) per decade. The slope is a straight line fitted to 82 complete years; the brackets give its 95 percent interval.

Across 82 years with a frost, the median last spring frost at General Wayne A Downing Intl A falls on 19 April and the median first autumn frost on 18 October, which leaves a median of 181 days between them.

In 1996 to 2025 the median growing season was 188 days. That is 6 days more than in 1944 to 1973.

Fitted over all years, the growing season changes by +1.8 days per decade at this station.

A day with at least 60.1 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 146.8 mm (5.8 in) of rain is expected about once in 100 years.

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 82 years of values from 1944 to 2025.

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: 131.8 mm (5.2 in) in 2020; 128.5 mm (5.1 in) in 1950; 112.5 mm (4.4 in) in 1965.

One change was suspected in the annual mean temperature of General Wayne A Downing Intl A, at 1981. Each is measured against neighbouring stations.

• Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.2 C (0.4 F) higher than in the years before (likely change).

Over 2011 to 2025, General Wayne A Downing Intl A had a mean temperature of 11.9 C (53.5 F) and 977.8 mm (38.5 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Windsor (United States, 164 km away), Tuscola (United States, 153 km away) and Effingham 3SW (United States, 195 km away).