Kelowna Weather Records (CA001123930)

The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1903 to 1961. In Fahrenheit: 0.4 F (0.2 to 0.6) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.

Across 59 years with a frost, the median last spring frost at Kelowna falls on 5 May and the median first autumn frost on 5 October, which leaves a median of 153 days between them.

Fitted over all years, the growing season changes by +4.3 days per decade at this station.

A day with at least 20.6 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 43.2 mm (1.7 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, 60 years of values from 1900 to 1961.

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: 41.9 mm (1.6 in) in 1944; 40.6 mm (1.6 in) in 1927; 37.6 mm (1.5 in) in 1950.

One change was suspected in the annual mean temperature of Kelowna, at 1932. Each is measured against neighbouring stations.

• Relative to 5 neighbouring stations, the station's annual mean temperature from 1932 ran 0.3 C (0.6 F) higher than in the years before (likely change).