| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | -4°F | 16°F | 6°F | 11.4" |
| February | -4°F | 17°F | 6°F | 3.4" |
| March | 12°F | 31°F | 21°F | 2.2" |
| April | 27°F | 51°F | 38°F | 1.3" |
| May | 38°F | 65°F | 51°F | 2.8" |
| June | 50°F | 74°F | 61°F | 4.0" |
| July | 53°F | 78°F | 65°F | 2.5" |
| August | 51°F | 78°F | 63°F | 2.6" |
| September | 44°F | 71°F | 56°F | 3.1" |
| October | 31°F | 54°F | 41°F | 0.8" |
| November | 17°F | 36°F | 25°F | 1.2" |
| December | -1°F | 17°F | 8°F | 7.7" |
| Index | Calvin | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 240,103 | 1,038,665 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 320 |
| Days with moderate air quality | 45 |
| 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 | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hannah, ND | 8 | 33 | 34.0% |
| Munich, ND | 259 | 33 | 34.0% |
| Rocklake, ND | 114 | 36 | 28.0% |
| Sarles, ND | 9 | 36 | 28.0% |
| Calvin, ND | 11 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Oljato-Monument Valley, AZ | 11 | 49 | 2.0% |
| Wintersburg, AZ | 11 | 74 | 48.0% |
| Cuyama, CA | 11 | 44 | 12.0% |
| Cathedral, CO | 11 | 44 | 12.0% |
| Bankston, IA | 11 | 29 | 42.0% |
| Calvin, ND | 11 | 36 | 28.0% |
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