| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 58°F | 45°F | 1.5" |
| February | 38°F | 64°F | 50°F | 1.1" |
| March | 42°F | 72°F | 56°F | 1.0" |
| April | 47°F | 78°F | 62°F | 0.9" |
| May | 53°F | 87°F | 70°F | 0.2" |
| June | 60°F | 95°F | 78°F | 0.1" |
| July | 64°F | 100°F | 83°F | 0.0" |
| August | 62°F | 99°F | 81°F | 0.0" |
| September | 57°F | 94°F | 75°F | 0.0" |
| October | 49°F | 82°F | 64°F | 0.4" |
| November | 40°F | 68°F | 52°F | 0.6" |
| December | 34°F | 58°F | 45°F | 1.4" |
| Index | Grangeville | California | National |
| Air quality index | 56 | 55 | 42 |
| Pollution index | 21,828,100 | 10,473,190 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 152 |
| Days with moderate air quality | 172 |
| Days w/ poor A.Q. for sensitive groups | 37 |
| Days with unhealthy air quality | 2 |
| Pollutant | Total |
| Arsenic | 0.160% |
| Benzene | 0.440% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.100% |
| Mercury | 0.200% |
| City | Population | Air Quality Index | National Avg. |
| Hanford, CA | 57,339 | 56 | 12.0% |
| Lanare, CA | 241 | 56 | 12.0% |
| Home Garden, CA | 1,590 | 56 | 12.0% |
| Stratford, CA | 771 | 56 | 12.0% |
| Laton, CA | 1,967 | 56 | 12.0% |
| Grangeville, CA | 324 | 56 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Shaktoolik, AK | 324 | 38 | 24.0% |
| Etowah, AR | 324 | 45 | 10.0% |
| Las Flores CDP (Tehama County), CA | 324 | 89 | 78.0% |
| Stonefort, IL | 324 | 44 | 12.0% |
| Summerfield, IL | 324 | 54 | 8.0% |
| Grangeville, CA | 324 | 56 | 12.0% |
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