Tappen Weather Records (CA001167980)

The fitted trend in annual mean temperature here over 1913 to 1960 is -0.1 C (-0.4 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.7 to 0.2) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.

Across 42 years with a frost, the median last spring frost at Tappen falls on 12 May and the median first autumn frost on 26 September, which leaves a median of 141 days between them.

Fitted over all years, the growing season changes by +0.5 days per decade at this station.

A day with at least 24.0 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 45.7 mm (1.8 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, 43 years of values from 1913 to 1959.

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: 40.6 mm (1.6 in) in 1956; 38.9 mm (1.5 in) in 1942; 38.9 mm (1.5 in) in 1951.

3 changes were suspected in the annual mean temperature of Tappen, at 1921, 1927 and 1951. Each is measured against neighbouring stations.

• Relative to 5 neighbouring stations, the station's annual mean temperature from 1921 ran 1.4 C (2.6 F) lower than in the years before (possible change).
• Relative to 5 neighbouring stations, the station's annual mean temperature from 1927 ran 0.9 C (1.7 F) higher than in the years before (likely change).
• Relative to 5 neighbouring stations, the station's annual mean temperature from 1951 ran 1.1 C (1.9 F) lower than in the years before (likely change).