Average change in
Temperature
Average change in high temperature day-to-day
Last Month:
4.3°
Last Year:
4.1°
Average change in low temperature day-to-day
Last Month:
7.5°
Last Year:
5.6°
Average change in
Precipitation
Chance of dry day after a precip day
Last Month:
60%
Last Year:
59%
Chance of precip day after a dry day
Last Month:
17%
Last Year:
10%
ForecastAdvisor Fact
On average, Persistence's high temperature forecasts for Portland were off by 5.71 degrees last month.