| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 48°F | 31°F | 0.1" |
| February | 21°F | 52°F | 35°F | 0.2" |
| March | 30°F | 65°F | 46°F | 0.5" |
| April | 38°F | 72°F | 53°F | 1.0" |
| May | 47°F | 81°F | 63°F | 1.7" |
| June | 59°F | 93°F | 75°F | 1.5" |
| July | 64°F | 96°F | 79°F | 2.2" |
| August | 62°F | 93°F | 76°F | 1.5" |
| September | 53°F | 87°F | 69°F | 1.0" |
| October | 40°F | 74°F | 55°F | 1.1" |
| November | 28°F | 62°F | 43°F | 0.2" |
| December | 18°F | 47°F | 30°F | 0.3" |
| Index | Haswell | Colorado | National |
| Air quality index | 20 | 38 | 42 |
| Pollution index | 265,058 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 126 |
| Days with good air quality | 125 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Haswell, CO | 60 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Igiugig, AK | 60 | 31 | 38.0% |
| Whitestone, AK | 60 | 38 | 24.0% |
| Petrey, AL | 60 | 52 | 4.0% |
| Lake Harbor, FL | 60 | 36 | 28.0% |
| Colwell, IA | 60 | 15 | 70.0% |
| Haswell, CO | 60 | 20 | 60.0% |
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