| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 51°F | 35°F | 1.4" |
| February | 25°F | 54°F | 37°F | 1.5" |
| March | 35°F | 67°F | 49°F | 1.6" |
| April | 43°F | 74°F | 56°F | 3.0" |
| May | 52°F | 82°F | 65°F | 0.9" |
| June | 64°F | 93°F | 78°F | 3.9" |
| July | 68°F | 96°F | 81°F | 2.8" |
| August | 67°F | 93°F | 79°F | 6.0" |
| September | 58°F | 87°F | 71°F | 3.1" |
| October | 46°F | 75°F | 59°F | 2.3" |
| November | 34°F | 63°F | 46°F | 2.5" |
| December | 25°F | 49°F | 35°F | 1.4" |
| Index | Spearman | Texas | National |
| Air quality index | 44 | 52 | 42 |
| Pollution index | 1,293,160 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 259 |
| Days with moderate air quality | 96 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Gruver, TX | 1,482 | 44 | 12.0% |
| Spearman, TX | 3,123 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Malabar, FL | 3,123 | 36 | 28.0% |
| Saint-Christophe-d'Arthabaska, QC | 3,123 | n/a | |
| Bandon, OR | 3,122 | 19 | 62.0% |
| Frazier Park, CA | 3,121 | 67 | 34.0% |
| Okanagan (Part) 1, BC | 3,121 | n/a | |
| Spearman, TX | 3,123 | 44 | 12.0% |
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