Weather forecast accuracy details for Groton, Connecticut

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   83.87% 75.27% 82.80% 82.80% 81.18%
Foreca/Vaisala   73.12% 65.59% 84.95% 84.95% 77.15%
Weather Underground   83.87% 74.19% 74.19% 74.19% 76.61%
Dark Sky   66.67% 63.44% 84.95% 84.95% 75.00%
AccuWeather   80.00% 67.78% 73.33% 73.33% 73.61%
AerisWeather   70.00% 62.22% 75.56% 75.56% 70.83%
NWS Digital Forecast   70.97% 65.59% 64.52% 64.52% 66.40%
OpenWeather   60.22% 33.33% 82.80% 82.80% 64.78%
World Weather Online   61.29% 41.94% 75.27% 75.27% 63.44%
Wetter   67.74% 41.94% 67.74% 67.74% 61.29%
Weatherbit   58.70% 38.71% 71.74% 71.74% 60.22%
Weather News   72.04% 40.86% 48.39% 48.39% 52.42%
Persistence   22.39% 30.43% 55.22% 55.22% 40.82%

Weather Forecast Accuracy Data Last Year (2021)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   86.06% 76.55% 87.81% 87.81% 84.56%
Weather Underground   85.87% 76.73% 84.95% 84.95% 83.13%
Foreca/Vaisala   80.98% 71.93% 84.46% 84.49% 80.46%
AccuWeather   83.29% 72.46% 84.75% 79.46% 79.99%
AerisWeather   72.24% 66.76% 81.06% 81.06% 75.28%
NWS Digital Forecast   75.95% 68.34% 72.56% 72.56% 72.35%
Dark Sky   48.48% 63.25% 83.10% 83.10% 69.48%
Weatherbit   64.71% 52.35% 80.42% 80.42% 69.47%
Wetter   72.30% 43.77% 80.70% 80.70% 69.37%
OpenWeather   68.42% 49.22% 77.38% 77.38% 68.10%
Weather News   73.13% 56.60% 67.31% 67.31% 66.09%
World Weather Online   67.96% 51.57% 71.48% 71.48% 65.62%
Persistence   35.96% 30.89% 54.52% 54.52% 43.97%

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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