| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 3°F | 22°F | 12°F | 0.2" |
| February | 5°F | 24°F | 13°F | 0.3" |
| March | 19°F | 39°F | 27°F | 0.7" |
| April | 31°F | 56°F | 42°F | 1.3" |
| May | 43°F | 68°F | 55°F | 3.8" |
| June | 55°F | 78°F | 65°F | 3.9" |
| July | 59°F | 84°F | 71°F | 2.6" |
| August | 56°F | 81°F | 67°F | 2.7" |
| September | 48°F | 73°F | 59°F | 2.5" |
| October | 36°F | 57°F | 45°F | 1.8" |
| November | 21°F | 41°F | 30°F | 0.5" |
| December | 6°F | 23°F | 15°F | 0.4" |
| Index | Fredonia | North Dakota | National |
| Air quality index | 20 | 35 | 42 |
| Pollution index | 261,954 | 1,038,665 | 2,726,193 |
| Measurement | Total |
| Days measured | 122 |
| Days with good air quality | 112 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Kulm, ND | 442 | 20 | 60.0% |
| Lehr, ND | 64 | 20 | 60.0% |
| Jud, ND | 70 | 20 | 60.0% |
| Fredonia, ND | 29 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Larsen Bay, AK | 29 | 31 | 38.0% |
| Birdsong, AR | 29 | 45 | 10.0% |
| Norristown, GA | 29 | 47 | 6.0% |
| St. Anthony, IA | 29 | 37 | 26.0% |
| Kaskaskia, IL | 29 | 54 | 8.0% |
| Fredonia, ND | 29 | 20 | 60.0% |
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