| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 31°F | 21°F | 1.6" |
| February | 17°F | 38°F | 27°F | 1.3" |
| March | 27°F | 51°F | 38°F | 1.8" |
| April | 33°F | 61°F | 46°F | 2.3" |
| May | 39°F | 70°F | 54°F | 2.3" |
| June | 46°F | 83°F | 65°F | 1.2" |
| July | 54°F | 93°F | 74°F | 0.5" |
| August | 51°F | 90°F | 71°F | 0.8" |
| September | 43°F | 80°F | 60°F | 1.5" |
| October | 33°F | 64°F | 47°F | 1.5" |
| November | 25°F | 49°F | 36°F | 1.2" |
| December | 16°F | 34°F | 25°F | 1.2" |
| Index | Portage | Utah | National |
| Air quality index | 44 | 45 | 42 |
| Pollution index | 859,937 | 3,340,369 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 272 |
| Days with moderate air quality | 79 |
| Days w/ poor A.Q. for sensitive groups | 14 |
| 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. |
| Malad City, ID | 1,945 | 44 | 12.0% |
| Cornish, UT | 211 | 44 | 12.0% |
| Peter, UT | 394 | 44 | 12.0% |
| Plymouth, UT | 364 | 44 | 12.0% |
| Weston, ID | 440 | 44 | 12.0% |
| Portage, UT | 237 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Teller, AK | 237 | 38 | 24.0% |
| Ulm, AR | 237 | 45 | 10.0% |
| Melvin, IA | 237 | 36 | 28.0% |
| McNabb, IL | 237 | 0 | 100.0% |
| Menominee, IL | 237 | 29 | 42.0% |
| Portage, UT | 237 | 44 | 12.0% |
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