Weather forecast accuracy details for Philadelphia, Pennsylvania

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   86.02% 87.10% 86.02% 86.02% 86.29%
Weather Underground   87.10% 88.17% 83.87% 83.87% 85.75%
AccuWeather   85.87% 83.87% 84.78% 84.78% 84.83%
AerisWeather   79.57% 72.04% 87.10% 87.10% 81.45%
Foreca/Vaisala   80.65% 86.02% 78.49% 78.49% 80.91%
Dark Sky   62.37% 78.49% 84.95% 84.95% 77.69%
NWS Digital Forecast   79.57% 73.12% 78.49% 78.49% 77.42%
Wetter   64.52% 79.57% 74.19% 74.19% 73.12%
World Weather Online   75.27% 54.84% 79.57% 79.57% 72.31%
OpenWeather   64.52% 63.44% 80.65% 80.65% 72.31%
Weather News   63.44% 63.44% 75.27% 75.27% 69.35%
Weatherbit   60.23% 35.96% 81.82% 81.82% 64.95%
Persistence   30.88% 26.09% 51.47% 51.47% 39.98%

Weather Forecast Accuracy Data Last Year (2021)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   83.75% 84.95% 85.60% 85.60% 84.97%
Weather Underground   83.84% 85.04% 83.66% 83.66% 84.05%
Foreca/Vaisala   80.79% 83.10% 83.92% 84.49% 83.08%
AccuWeather   83.66% 85.06% 82.30% 81.14% 83.04%
Dark Sky   72.48% 83.19% 83.19% 83.19% 80.52%
AerisWeather   78.98% 76.39% 80.74% 80.74% 79.21%
Wetter   74.52% 71.28% 77.75% 77.75% 75.32%
NWS Digital Forecast   79.53% 73.93% 73.90% 73.90% 75.31%
World Weather Online   66.48% 69.72% 76.94% 76.94% 72.52%
Weatherbit   64.12% 59.51% 78.44% 78.44% 70.13%
OpenWeather   70.36% 49.95% 78.12% 78.12% 69.14%
Weather News   66.94% 66.67% 67.59% 67.59% 67.20%
Persistence   33.33% 33.58% 56.26% 56.26% 44.86%

If this data feeds your inner weather geek, you'll probably be interested in the amazing amount of weather data available from ForecastWatch. Likewise, if you're looking to assess your own forecasting accuracy or would like to make more informed decisions about a weather provider you're considering or already use, we can provide data to help you.

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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