Provo Byu Weather Records (USC00427064)

The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1918 to 2025. In Fahrenheit: 0.7 F (0.6 to 0.8) per decade. The slope is a straight line fitted to 52 complete years; the brackets give its 95 percent interval.

Across 52 years with a frost, the median last spring frost at Provo Byu falls on 25 April and the median first autumn frost on 15 October, which leaves a median of 179 days between them.

Fitted over all years, the growing season changes by +4.6 days per decade at this station.

A day with at least 29.3 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 45.8 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, 45 years of values from 1981 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: 42.9 mm (1.7 in) in 2021; 42.2 mm (1.7 in) in 1986; 41.1 mm (1.6 in) in 1985.

2 changes were suspected in the annual mean temperature of Provo Byu, at 1994 and 2014. Each is measured against neighbouring stations.

• Relative to 5 neighbouring stations, the station's annual mean temperature from 1994 ran 0.5 C (0.8 F) higher than in the years before (likely change).
• Relative to 5 neighbouring stations, the station's annual mean temperature from 2014 ran 0.2 C (0.4 F) higher than in the years before (possible change).