Weather forecast accuracy details for Grand Rapids, Michigan

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 (October)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   81.72% 74.19% 92.47% 92.47% 85.22%
AerisWeather   74.19% 75.27% 88.17% 88.17% 81.45%
Weather Underground   81.72% 73.12% 82.80% 82.80% 80.11%
NWS Digital Forecast   77.42% 74.19% 82.80% 82.80% 79.30%
AccuWeather   88.04% 75.27% 75.00% 76.09% 78.60%
World Weather Online   72.04% 66.67% 87.10% 87.10% 78.23%
Foreca/Vaisala   80.65% 53.76% 89.25% 89.25% 78.23%
OpenWeather   81.72% 48.39% 86.02% 86.02% 75.54%
Dark Sky   72.04% 36.56% 90.32% 90.32% 72.31%
Wetter   80.65% 52.69% 77.42% 77.42% 72.04%
Weatherbit   73.12% 38.04% 87.10% 87.10% 71.34%
Weather News   70.97% 60.22% 75.27% 75.27% 70.43%
Persistence   31.88% 43.48% 57.97% 57.97% 47.83%

Weather Forecast Accuracy Data Last Year (2021)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   84.49% 78.12% 80.15% 80.15% 80.72%
Foreca/Vaisala   80.06% 72.48% 81.56% 82.27% 79.09%
Weather Underground   84.12% 78.67% 76.55% 76.55% 78.97%
AccuWeather   81.70% 78.46% 70.62% 73.95% 76.18%
AerisWeather   78.80% 71.02% 77.13% 77.41% 76.09%
Dark Sky   77.56% 63.53% 78.58% 78.58% 74.56%
NWS Digital Forecast   77.61% 74.16% 70.77% 70.77% 73.33%
OpenWeather   58.91% 46.45% 73.96% 73.96% 63.32%
Weatherbit   56.21% 50.99% 72.23% 72.23% 62.91%
Wetter   57.34% 56.69% 68.05% 68.05% 62.53%
World Weather Online   55.77% 55.22% 68.70% 68.70% 62.10%
Weather News   67.62% 59.19% 58.83% 58.83% 61.12%
Persistence   35.11% 27.55% 57.58% 57.58% 44.46%

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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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