| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 27°F | 18°F | 2.1" |
| February | 14°F | 32°F | 22°F | 3.7" |
| March | 28°F | 46°F | 35°F | 3.9" |
| April | 38°F | 61°F | 48°F | 4.8" |
| May | 49°F | 72°F | 60°F | 6.4" |
| June | 60°F | 81°F | 70°F | 7.8" |
| July | 63°F | 84°F | 73°F | 7.3" |
| August | 60°F | 81°F | 70°F | 6.7" |
| September | 52°F | 77°F | 63°F | 4.7" |
| October | 40°F | 63°F | 50°F | 7.2" |
| November | 28°F | 48°F | 37°F | 4.5" |
| December | 16°F | 31°F | 23°F | 2.5" |
| Index | Hubbard | Iowa | National |
| Air quality index | 37 | 39 | 50 |
| Pollution index | 1,171,930 | 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 | 0.060% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.004% |
| Mercury | 0.050% |
| City, State | Population | Air Quality Index | National Avg. |
| Ellsworth, IA | 574 | 37 | 26% |
| Alden, IA | 769 | 37 | 26% |
| McCallsburg, IA | 325 | 37 | 26% |
| St. Anthony, IA | 115 | 37 | 26% |
| Union, IA | 487 | 37 | 26% |
| Hubbard, IA | 891 | 37 | 26% |
| City, State | Population | Air Quality Index | National Avg. |
| Claysville, PA | 891 | 39 | 22% |
| New Salem, ND | 891 | 36 | 28% |
| Brookport, IL | 892 | 44 | 12% |
| Zia Pueblo, NM | 890 | 53 | 6% |
| Seelyville, IN | 890 | 45 | 10% |
| Hubbard, IA | 891 | 37 | 26% |
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