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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 25°F | 17°F | 0.7" |
| February | 11°F | 29°F | 20°F | 1.1" |
| March | 25°F | 44°F | 34°F | 2.2" |
| April | 36°F | 60°F | 47°F | 5.1" |
| May | 48°F | 71°F | 59°F | 5.0" |
| June | 58°F | 81°F | 69°F | 5.4" |
| July | 61°F | 84°F | 72°F | 4.2" |
| August | 59°F | 82°F | 70°F | 4.0" |
| September | 51°F | 76°F | 62°F | 4.3" |
| October | 38°F | 62°F | 49°F | 2.7" |
| November | 26°F | 47°F | 36°F | 1.5" |
| December | 13°F | 29°F | 21°F | 1.4" |
| Index | Crystal Lake | Iowa | National |
| Air quality index | 15 | 39 | 42 |
| Pollution index | 784,924 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 118 |
| Days with good air quality | 118 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Buffalo Center, IA | 969 | 15 | 70.0% |
| Garner, IA | 3,060 | 15 | 70.0% |
| Leland, IA | 313 | 15 | 70.0% |
| St. Benedict, IA | 24 | 15 | 70.0% |
| Woden, IA | 177 | 15 | 70.0% |
| Crystal Lake, IA | 264 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Industry, CA | 264 | 72 | 44.0% |
| Bliss, ID | 264 | 20 | 60.0% |
| Sweetwater, ID | 264 | 29 | 42.0% |
| Fenton, LA | 264 | 45 | 10.0% |
| Grand Cane, LA | 264 | 39 | 22.0% |
| Crystal Lake, IA | 264 | 15 | 70.0% |
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