| 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 | 50 |
| Pollution index | 426,616 | 1,643,836 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Ayrshire, IA | 136 | 15 | 70% |
| West Bend, IA | 851 | 15 | 70% |
| Rolfe, IA | 572 | 15 | 70% |
| Rodman, IA | 39 | 15 | 70% |
| Mallard, IA | 280 | 15 | 70% |
| Havelock, IA | 137 | 37 | 26% |
| City, State | Population | Air Quality Index | National Avg. |
| Latah, WA | 137 | 43 | 14% |
| Longview, IL | 137 | 42 | 16% |
| Concord, NE | 137 | 35 | 30% |
| Hardy, NE | 137 | 19 | 62% |
| Devol, OK | 137 | 26 | 48% |
| Havelock, IA | 137 | 37 | 26% |
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