| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 37°F | 27°F | 3.5" |
| February | 25°F | 45°F | 34°F | 2.2" |
| March | 29°F | 56°F | 42°F | 1.8" |
| April | 34°F | 64°F | 49°F | 2.6" |
| May | 43°F | 74°F | 58°F | 1.0" |
| June | 50°F | 83°F | 67°F | 4.4" |
| July | 61°F | 94°F | 78°F | 0.3" |
| August | 58°F | 88°F | 72°F | 1.9" |
| September | 48°F | 77°F | 62°F | 3.6" |
| October | 37°F | 64°F | 49°F | 2.3" |
| November | 27°F | 52°F | 38°F | 1.1" |
| December | 14°F | 34°F | 24°F | 2.0" |
| Index | Helper | Utah | National |
| Air quality index | 46 | 45 | 42 |
| Pollution index | 2,685,200 | 3,340,369 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 265 |
| Days with moderate air quality | 99 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.360% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.090% |
| City | Population | Air Quality Index | National Avg. |
| Carbonville, UT | 1,170 | 46 | 8.0% |
| Kenilworth, UT | 119 | 46 | 8.0% |
| Price, UT | 8,303 | 46 | 8.0% |
| Spring Glen, UT | 1,126 | 46 | 8.0% |
| West Wood, UT | 864 | 46 | 8.0% |
| Helper, UT | 2,346 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Denmark, WI | 2,346 | 36 | 28.0% |
| Fremont, IN | 2,345 | 45 | 10.0% |
| Curwensville, PA | 2,345 | 33 | 34.0% |
| Walkerton, IN | 2,344 | 42 | 16.0% |
| Salmon Brook, CT | 2,348 | 41 | 18.0% |
| Helper, UT | 2,346 | 46 | 8.0% |
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