Weather forecast accuracy details for Ione, California

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 (February)

Provider High Temp Low Temp Icon Precip Text Precip Overall
Microsoft   93.10% 80.46% 94.25% 95.40% 90.80%
The Weather Channel   88.51% 88.51% 91.95% 91.95% 90.23%
Weatherbit   91.76% 82.14% 90.59% 90.59% 88.77%
NWS Digital Forecast   88.51% 82.76% 89.66% 89.66% 87.64%
AerisWeather   86.21% 79.31% 89.66% 89.66% 86.21%
Foreca/Vaisala   87.36% 70.11% 93.10% 93.10% 85.92%
AccuWeather   86.75% 79.27% 89.16% 84.34% 84.88%
Open-Meteo   66.67% 67.82% 90.80% 90.80% 79.02%
OpenWeather   65.52% 70.11% 89.66% 89.66% 78.74%
World Weather Online   63.22% 68.97% 89.66% 89.66% 77.87%
Pirate Weather   66.67% 45.98% 94.25% 94.25% 75.29%
Wetter   65.52% 72.41% 80.46% 67.82% 71.55%
Persistence   42.86% 43.75% 68.25% 68.25% 55.78%

Weather Forecast Accuracy Data Last Year (2023)

Provider High Temp Low Temp Icon Precip Text Precip Overall
The Weather Channel   85.22% 87.97% 95.16% 95.16% 90.88%
Microsoft   84.60% 86.80% 94.83% 94.83% 90.27%
Foreca/Vaisala   84.85% 81.27% 94.79% 94.79% 88.93%
AerisWeather   82.46% 84.02% 93.61% 93.61% 88.42%
AccuWeather   84.08% 83.52% 93.18% 92.42% 88.30%
NWS Digital Forecast   80.91% 81.19% 91.61% 91.61% 86.33%
Weatherbit   73.19% 78.08% 93.15% 93.15% 84.39%
Pirate Weather   59.56% 50.14% 93.66% 93.66% 74.26%
Wetter   47.93% 60.15% 91.14% 90.50% 72.43%
World Weather Online   49.09% 57.73% 90.45% 90.45% 71.93%
OpenWeather   50.96% 52.98% 91.32% 91.32% 71.65%
Persistence   49.02% 47.29% 80.00% 80.00% 64.08%

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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