5-day weather forecast for Grafton, Illinois

Weather changeability for Grafton, Illinois

Temperature Last Month Last Year
Average change in high temperature day-to-day 7.9° 7.2°
Average change in low temperature day-to-day 8.0° 7.5°
Precipitation Last Month Last Year
Chance of dry day after a precip day 41% 63%
Chance of precip day after a dry day 46% 17%

Weather forecast accuracy for Grafton, Illinois

Last Month
Foreca   68.89%
MeteoGroup   66.67%
The Weather Channel   66.11%
Weather Underground   65.56%
NWS Digital Forecast   65.52%
AccuWeather   64.44%
Dark Sky (forecast.io)   57.78%
World Weather Online   49.72%
Persistence   34.72%
Last Year
Weather Underground   75.03%
The Weather Channel   74.98%
MeteoGroup   74.40%
Foreca   74.09%
AccuWeather   74.05%
NWS Digital Forecast   68.82%
Dark Sky (forecast.io)   68.45%
World Weather Online   61.08%
Persistence   48.50%

ForecastAdvisor Fact

On average, Dark Sky (forecast.io)'s low temperature forecasts for Grafton were off by 3.34 degrees last month.