Weather forecast accuracy details for Herndon, Virginia

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
Weather Underground   78.49% 74.19% 84.95% 84.95% 80.65%
The Weather Channel   77.42% 74.19% 81.72% 81.72% 78.76%
Foreca/Vaisala   78.49% 63.44% 86.02% 86.02% 78.49%
Wetter   66.67% 65.59% 84.95% 86.02% 75.81%
AccuWeather   72.22% 73.33% 77.78% 77.78% 75.28%
Dark Sky   65.59% 63.44% 79.57% 79.57% 72.04%
AerisWeather   64.44% 54.44% 80.00% 80.00% 69.72%
Weather News   56.99% 49.46% 83.87% 83.87% 68.55%
Weatherbit   54.35% 46.24% 82.61% 82.61% 66.45%
World Weather Online   66.67% 52.69% 66.67% 66.67% 63.17%
NWS Digital Forecast   63.44% 53.76% 64.52% 64.52% 61.56%
OpenWeather   58.06% 23.66% 74.19% 74.19% 57.53%
Persistence   20.97% 21.21% 61.29% 61.29% 41.19%

Weather Forecast Accuracy Data Last Year (2021)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   82.36% 74.88% 85.96% 85.96% 82.29%
Weather Underground   82.64% 74.88% 84.67% 84.67% 81.72%
AccuWeather   82.82% 76.02% 83.62% 80.39% 80.71%
Foreca/Vaisala   75.62% 67.59% 82.37% 83.84% 77.36%
AerisWeather   76.88% 68.52% 81.15% 81.15% 76.93%
Dark Sky   76.36% 58.36% 82.92% 82.92% 75.14%
NWS Digital Forecast   76.99% 67.90% 71.38% 71.38% 71.91%
Wetter   66.94% 57.99% 79.59% 79.69% 71.05%
Weatherbit   62.08% 51.31% 81.93% 81.93% 69.31%
Weather News   67.41% 55.40% 70.36% 70.36% 65.88%
OpenWeather   58.91% 49.86% 77.29% 77.29% 65.84%
World Weather Online   58.45% 55.12% 73.59% 73.59% 65.19%
Persistence   32.60% 30.77% 57.36% 57.36% 44.52%

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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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