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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 | Spencer | Iowa | National |
| Air quality index | 35 | 39 | 42 |
| Pollution index | 1,563,560 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 322 |
| Days with moderate air quality | 42 |
| 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. |
| Ruthven, IA | 771 | 15 | 70.0% |
| Terril, IA | 343 | 32 | 36.0% |
| Royal, IA | 505 | 35 | 30.0% |
| Rossie, IA | 83 | 35 | 30.0% |
| Dickens, IA | 206 | 35 | 30.0% |
| Spencer, IA | 11,038 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Franklin Lakes, NJ | 11,044 | 51 | 2.0% |
| Ontario, OR | 11,031 | 36 | 28.0% |
| Middle Island, NY | 11,030 | 43 | 14.0% |
| Munhall, PA | 11,049 | 56 | 12.0% |
| Holbrook, MA | 11,051 | 43 | 14.0% |
| Spencer, IA | 11,038 | 35 | 30.0% |
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