Weather forecast accuracy details for Ontario, 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.
Click on the headers to sort by that column.
Weather Forecast Accuracy Data Last Month (December)
| Provider | High Temp | Low Temp | Icon Precip | Text Precip | Overall |
|---|---|---|---|---|---|
| AccuWeather | 81.11% | 78.89% | 100.00% | 97.85% | 89.46% |
| Microsoft | 73.03% | 75.28% | 98.91% | 100.00% | 86.81% |
| Pirate Weather | 80.00% | 60.00% | 97.85% | 97.85% | 83.92% |
| Foreca/Vaisala | 67.78% | 70.00% | 97.85% | 97.85% | 83.37% |
| Weatherbit | 72.22% | 62.22% | 96.77% | 96.77% | 82.00% |
| AerisWeather | 73.33% | 58.89% | 97.85% | 97.85% | 81.98% |
| NWS Digital Forecast | 64.44% | 66.67% | 93.55% | 93.55% | 79.55% |
| The Weather Channel | 80.00% | 42.22% | 96.77% | 96.77% | 78.94% |
| Persistence | 23.94% | 62.86% | 95.89% | 95.89% | 69.65% |
| Open-Meteo | 67.78% | 18.89% | 95.70% | 95.70% | 69.52% |
| Wetter.com | 58.89% | 15.56% | 100.00% | 100.00% | 68.61% |
| World Weather Online | 62.22% | 15.56% | 97.85% | 97.85% | 68.37% |
| OpenWeather | 64.44% | 0.00% | 95.70% | 95.70% | 63.96% |
Weather Forecast Accuracy Data Last Year (2024)
| Provider | High Temp | Low Temp | Icon Precip | Text Precip | Overall |
|---|---|---|---|---|---|
| AccuWeather | 84.00% | 77.97% | 96.95% | 95.43% | 88.59% |
| Microsoft | 81.48% | 76.88% | 96.50% | 96.42% | 87.82% |
| The Weather Channel | 86.59% | 64.49% | 97.09% | 97.09% | 86.32% |
| Foreca/Vaisala | 77.53% | 72.71% | 96.43% | 96.43% | 85.77% |
| AerisWeather | 79.70% | 69.97% | 96.34% | 96.34% | 85.59% |
| Weatherbit | 82.79% | 70.55% | 94.49% | 94.49% | 85.58% |
| NWS Digital Forecast | 78.74% | 67.49% | 91.08% | 91.08% | 82.10% |
| Pirate Weather | 64.78% | 49.29% | 96.62% | 96.62% | 76.83% |
| World Weather Online | 71.39% | 19.36% | 94.27% | 94.27% | 69.82% |
| OpenWeather | 73.18% | 12.37% | 94.55% | 94.55% | 68.67% |
| Wetter.com | 54.96% | 23.04% | 94.65% | 93.15% | 66.45% |
| Persistence | 39.87% | 51.59% | 85.40% | 85.40% | 65.57% |
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The data here is calculated from forecasts and observations collected and analyzed by
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the methods, scientific approach, and the quality controls employed to ensure the data and analyses
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