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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -1°F | 27°F | 12°F | 0.3" |
| February | 3°F | 31°F | 16°F | 0.3" |
| March | 14°F | 43°F | 28°F | 0.5" |
| April | 22°F | 54°F | 37°F | 0.6" |
| May | 30°F | 63°F | 46°F | 1.5" |
| June | 37°F | 75°F | 57°F | 0.6" |
| July | 44°F | 84°F | 64°F | 0.8" |
| August | 41°F | 81°F | 61°F | 0.7" |
| September | 33°F | 72°F | 52°F | 0.9" |
| October | 24°F | 57°F | 39°F | 0.7" |
| November | 12°F | 43°F | 26°F | 0.2" |
| December | 0°F | 29°F | 14°F | 0.3" |
| Index | Fontenelle | Wyoming | National |
| Air quality index | 46 | 39 | 42 |
| Pollution index | 5,619,220 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 100 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.460% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.120% |
| Mercury | 0.270% |
| City | Population | Air Quality Index | National Avg. |
| Fontenelle, WY | 35 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Chignik Lagoon, AK | 35 | 31 | 38.0% |
| Summerhaven, AZ | 35 | 47 | 6.0% |
| Taylorsville, CA | 35 | 46 | 8.0% |
| Buck Grove, IA | 35 | 40 | 20.0% |
| Galt, IA | 35 | 15 | 70.0% |
| Fontenelle, WY | 35 | 46 | 8.0% |
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