| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 29°F | 20°F | 0.2" |
| February | 14°F | 31°F | 22°F | 2.0" |
| March | 29°F | 47°F | 36°F | 0.7" |
| April | 39°F | 61°F | 49°F | 3.9" |
| May | 50°F | 73°F | 61°F | 5.8" |
| June | 61°F | 82°F | 71°F | 2.9" |
| July | 64°F | 85°F | 74°F | 2.8" |
| August | 62°F | 81°F | 70°F | 2.6" |
| September | 54°F | 76°F | 64°F | 2.7" |
| October | 42°F | 62°F | 51°F | 1.9" |
| November | 29°F | 49°F | 37°F | 0.9" |
| December | 17°F | 32°F | 24°F | 3.5" |
| Index | Havelock | Iowa | National |
| Air quality index | 37 | 39 | 42 |
| Pollution index | 426,616 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 214 |
| Days with good air quality | 210 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Rodman, IA | 24 | 15 | 70.0% |
| Mallard, IA | 227 | 15 | 70.0% |
| Bradgate, IA | 133 | 15 | 70.0% |
| Curlew, IA | 67 | 15 | 70.0% |
| Plover, IA | 97 | 15 | 70.0% |
| Havelock, IA | 132 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Yellow Bluff, AL | 132 | 52 | 4.0% |
| Vallecito, CA | 132 | 39 | 22.0% |
| Otter Creek, FL | 132 | 35 | 30.0% |
| Blockton, IA | 132 | 43 | 14.0% |
| Geneva, IA | 132 | 15 | 70.0% |
| Havelock, IA | 132 | 37 | 26.0% |
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