| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 21°F | 13°F | 1.0" |
| February | 7°F | 26°F | 16°F | 1.4" |
| March | 21°F | 42°F | 30°F | 1.7" |
| April | 31°F | 57°F | 42°F | 3.3" |
| May | 43°F | 69°F | 56°F | 4.0" |
| June | 53°F | 78°F | 65°F | 3.9" |
| July | 58°F | 83°F | 70°F | 5.3" |
| August | 53°F | 82°F | 67°F | 4.0" |
| September | 47°F | 73°F | 59°F | 3.9" |
| October | 35°F | 58°F | 45°F | 2.6" |
| November | 21°F | 42°F | 30°F | 0.9" |
| December | 7°F | 26°F | 16°F | 1.8" |
| Index | Harvey | North Dakota | National |
| Air quality index | 36 | 35 | 50 |
| Pollution index | 220,768 | 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 | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Heimdal, ND | 9 | 36 | 28.0% |
| Martin, ND | 70 | 36 | 28.0% |
| Anamoose, ND | 303 | 36 | 28.0% |
| Selz, ND | 28 | 36 | 28.0% |
| Fessenden, ND | 491 | 36 | 28.0% |
| Harvey, ND | 1,923 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Wadley, GA | 1,923 | 47 | 6.0% |
| Holiday Heights, NJ | 1,923 | 41 | 18.0% |
| South Floral Park, NY | 1,923 | 51 | 2.0% |
| Berkeley Lake, GA | 1,924 | 52 | 4.0% |
| Wapello, IA | 1,922 | 32 | 36.0% |
| Harvey, ND | 1,923 | 36 | 28.0% |
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