5-day weather forecast for Chicago, Illinois

Weather forecast accuracy details for Chicago, Illinois

These are the one- to three-day out accuracy percentages for high temperature, low temperature, icon forecast precipitation (both rain and snow), and text forecast precipitation (both rain and snow). Temperature accuracy is the percentage of forecasts within three degrees. Precipitation accuracy is the percentage of correct forecasts. The forecasts are collected in the evening.

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Weather Forecast Accuracy Data Last Month (December)
Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   76.34% 76.34% 93.55% 93.55% 84.95%
Weather Underground   76.34% 76.34% 92.47% 92.47% 84.41%
Foreca   77.42% 77.42% 90.32% 90.32% 83.87%
AccuWeather   69.89% 78.49% 81.72% 81.72% 77.96%
Wetter   61.29% 63.44% 93.55% 93.55% 77.96%
NWS Digital Forecast   69.89% 77.42% 81.72% 81.72% 77.69%
AerisWeather   66.67% 72.04% 77.42% 77.42% 73.39%
World Weather Online   59.14% 50.54% 87.10% 87.10% 70.97%
Open Weathermap   59.14% 60.22% 81.72% 81.72% 70.70%
Weather News   56.04% 59.14% 83.52% 0.00% 49.68%
Persistence   26.88% 33.33% 55.91% 55.91% 43.01%
Weather Forecast Accuracy Data Last Year (2020)
Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   79.94% 81.43% 86.44% 86.44% 83.57%
Weather Underground   79.94% 81.43% 83.75% 83.75% 82.22%
AccuWeather   78.27% 81.62% 81.71% 81.15% 80.69%
Foreca   76.32% 76.51% 82.54% 82.54% 79.48%
AerisWeather   73.91% 73.17% 78.92% 78.92% 76.23%
NWS Digital Forecast   75.31% 74.64% 76.35% 76.35% 75.66%
Wetter   67.32% 61.34% 79.08% 79.08% 71.71%
Open Weathermap   62.67% 52.27% 79.39% 79.39% 68.43%
World Weather Online   62.85% 49.53% 74.95% 74.95% 65.57%
Weather News   63.41% 59.65% 67.67% 0.00% 47.68%
Persistence   30.68% 32.35% 52.69% 52.69% 42.10%
 
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The data here is calculated from forecasts and observations collected and analyzed by ForecastWatch. If you would like more information about the methods, scientific approach, and the quality controls employed to ensure the data and analyses are of the highest quality, please read this overview.

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