| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 65°F | 49°F | 3.6" |
| February | 40°F | 70°F | 53°F | 2.2" |
| March | 48°F | 79°F | 62°F | 2.3" |
| April | 55°F | 86°F | 69°F | 5.5" |
| May | 62°F | 90°F | 75°F | 5.8" |
| June | 70°F | 97°F | 83°F | 5.5" |
| July | 71°F | 95°F | 83°F | 7.0" |
| August | 71°F | 95°F | 82°F | 5.6" |
| September | 65°F | 90°F | 76°F | 4.7" |
| October | 56°F | 83°F | 68°F | 4.9" |
| November | 46°F | 74°F | 58°F | 3.6" |
| December | 37°F | 65°F | 49°F | 1.8" |
| Index | Grandfalls | Texas | National |
| Air quality index | 28 | 52 | 42 |
| Pollution index | 510,722 | 2,009,300 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 319 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Coyanosa, TX | 205 | 28 | 44.0% |
| Imperial, TX | 312 | 28 | 44.0% |
| Grandfalls, TX | 423 | 28 | 44.0% |
| City | Population | Air Quality Index | National Avg. |
| Oxford Junction, IA | 423 | 46 | 8.0% |
| Little York, IL | 423 | 32 | 36.0% |
| New Haven, IL | 423 | 45 | 10.0% |
| Advance, IN | 423 | 54 | 8.0% |
| New Strawn, KS | 423 | 22 | 56.0% |
| Grandfalls, TX | 423 | 28 | 44.0% |
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