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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 26°F | 17°F | 1.0" |
| February | 13°F | 30°F | 21°F | 1.0" |
| March | 27°F | 48°F | 36°F | 6.5" |
| April | 37°F | 62°F | 49°F | 6.0" |
| May | 51°F | 73°F | 61°F | 5.9" |
| June | 61°F | 84°F | 72°F | 4.4" |
| July | 63°F | 87°F | 75°F | 7.6" |
| August | 61°F | 83°F | 71°F | 7.9" |
| September | 54°F | 79°F | 65°F | 6.8" |
| October | 41°F | 65°F | 52°F | 3.1" |
| November | 25°F | 47°F | 35°F | 3.7" |
| December | 9°F | 25°F | 17°F | 1.0" |
| Index | Spirit Lake | Iowa | National |
| Air quality index | 32 | 39 | 42 |
| Pollution index | 1,563,560 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 327 |
| Days with moderate air quality | 35 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Estherville, IA | 5,729 | 15 | 70.0% |
| Orleans, IA | 524 | 32 | 36.0% |
| Superior, IA | 250 | 32 | 36.0% |
| Terril, IA | 343 | 32 | 36.0% |
| Jackson, MN | 3,208 | 32 | 36.0% |
| Spirit Lake, IA | 5,130 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Westlock, AB | 5,130 | n/a | |
| Daleville, AL | 5,125 | 35 | 30.0% |
| Glencoe, AL | 5,125 | 43 | 14.0% |
| La Crescent, MN | 5,135 | 35 | 30.0% |
| Maplewood, WA | 5,135 | 18 | 64.0% |
| Spirit Lake, IA | 5,130 | 32 | 36.0% |
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