| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 29°F | 2.8" |
| February | 22°F | 39°F | 30°F | 2.3" |
| March | 34°F | 54°F | 43°F | 3.6" |
| April | 44°F | 67°F | 54°F | 5.1" |
| May | 54°F | 75°F | 64°F | 4.7" |
| June | 63°F | 83°F | 73°F | 5.9" |
| July | 66°F | 85°F | 76°F | 4.3" |
| August | 65°F | 85°F | 74°F | 3.5" |
| September | 57°F | 79°F | 67°F | 3.2" |
| October | 46°F | 67°F | 55°F | 3.4" |
| November | 34°F | 54°F | 43°F | 3.0" |
| December | 26°F | 42°F | 33°F | 3.8" |
| Index | Speedway | Indiana | National |
| Air quality index | 54 | 56 | 42 |
| Pollution index | 2,395,300 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 148 |
| Days with moderate air quality | 212 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Danville, IN | 10,380 | 54 | 8.0% |
| Indianapolis, IN | 869,387 | 54 | 8.0% |
| Wynnedale, IN | 196 | 54 | 8.0% |
| Fishers, IN | 93,488 | 54 | 8.0% |
| Avon, IN | 18,056 | 54 | 8.0% |
| Speedway, IN | 12,327 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Saddlebrooke, AZ | 12,327 | 47 | 6.0% |
| Tamalpais-Homestead Valley, CA | 12,331 | 40 | 20.0% |
| New Baltimore, MI | 12,333 | 56 | 12.0% |
| St. Marys, PA | 12,333 | 35 | 30.0% |
| Gulfport, FL | 12,334 | 38 | 24.0% |
| Speedway, IN | 12,327 | 54 | 8.0% |
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