Weather forecast accuracy details for Chatham, Massachusetts

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   86.02% 73.12% 84.95% 84.95% 82.26%
Foreca/Vaisala   82.80% 67.74% 83.87% 83.87% 79.57%
Weather Underground   86.02% 74.19% 74.19% 74.19% 77.15%
AerisWeather   77.78% 58.89% 81.11% 81.11% 74.72%
AccuWeather   81.11% 70.00% 67.78% 67.78% 71.67%
World Weather Online   82.80% 50.54% 75.27% 75.27% 70.97%
OpenWeather   72.04% 48.39% 79.57% 79.57% 69.89%
Dark Sky   38.71% 66.67% 81.72% 81.72% 67.20%
NWS Digital Forecast   75.27% 58.06% 65.59% 65.59% 66.13%
Weatherbit   73.63% 45.05% 65.93% 65.93% 62.64%
Wetter   76.34% 39.78% 65.59% 65.59% 61.83%
Weather News   64.52% 27.96% 51.61% 51.61% 48.92%
Persistence   22.73% 23.53% 56.06% 56.06% 39.59%

Weather Forecast Accuracy Data Last Year (2021)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   85.23% 79.04% 87.72% 87.72% 84.93%
Foreca/Vaisala   83.01% 78.12% 87.46% 87.44% 84.01%
Weather Underground   85.50% 79.41% 82.92% 82.92% 82.69%
AccuWeather   85.25% 79.37% 81.73% 79.08% 81.36%
AerisWeather   72.50% 74.26% 81.85% 81.94% 77.64%
NWS Digital Forecast   76.94% 74.91% 73.06% 73.06% 74.49%
Weatherbit   68.50% 60.28% 77.29% 77.29% 70.84%
OpenWeather   64.17% 57.16% 77.10% 77.10% 68.88%
Dark Sky   31.95% 74.05% 84.03% 84.03% 68.51%
World Weather Online   65.93% 54.94% 70.45% 70.45% 65.44%
Wetter   48.38% 51.25% 76.73% 76.73% 63.27%
Weather News   57.80% 44.97% 63.16% 63.16% 57.27%
Persistence   39.37% 34.34% 53.58% 53.58% 45.22%

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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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