| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 23°F | 14°F | 2.5" |
| February | 5°F | 23°F | 14°F | 0.8" |
| March | 15°F | 34°F | 24°F | 4.1" |
| April | 27°F | 50°F | 37°F | 2.7" |
| May | 42°F | 69°F | 56°F | 5.3" |
| June | 51°F | 76°F | 63°F | 4.5" |
| July | 55°F | 80°F | 67°F | 4.5" |
| August | 53°F | 81°F | 66°F | 6.5" |
| September | 45°F | 72°F | 57°F | 5.2" |
| October | 32°F | 55°F | 42°F | 3.1" |
| November | 18°F | 37°F | 27°F | 1.7" |
| December | 1°F | 19°F | 10°F | 2.5" |
| Index | Gardena | North Dakota | National |
| Air quality index | 36 | 35 | 42 |
| Pollution index | 300,908 | 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 | 0.005% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Souris, ND | 66 | 34 | 32.0% |
| Kramer, ND | 33 | 36 | 28.0% |
| Bantry, ND | 9 | 36 | 28.0% |
| Barton, ND | 0 | 36 | 28.0% |
| Upham, ND | 203 | 36 | 28.0% |
| Gardena, ND | 27 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Slana, AK | 27 | 38 | 24.0% |
| Belgreen, AL | 27 | 37 | 26.0% |
| Flowing Springs, AZ | 27 | 60 | 20.0% |
| Prattville, CA | 27 | 46 | 8.0% |
| Bevington, IA | 27 | 39 | 22.0% |
| Gardena, ND | 27 | 36 | 28.0% |
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