| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 41°F | 31°F | 2.7" |
| February | 22°F | 43°F | 32°F | 2.6" |
| March | 33°F | 57°F | 44°F | 4.4" |
| April | 43°F | 69°F | 55°F | 5.1" |
| May | 52°F | 77°F | 64°F | 4.4" |
| June | 61°F | 85°F | 73°F | 4.7" |
| July | 64°F | 87°F | 75°F | 3.7" |
| August | 62°F | 87°F | 74°F | 2.8" |
| September | 55°F | 81°F | 67°F | 3.8" |
| October | 43°F | 69°F | 55°F | 3.8" |
| November | 32°F | 57°F | 43°F | 3.1" |
| December | 27°F | 46°F | 36°F | 4.1" |
| Index | New Haven CDP (Huron County) | Ohio | National |
| Air quality index | 54 | 40 | 42 |
| Pollution index | 7,300,490 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 139 |
| Days with moderate air quality | 206 |
| Days w/ poor A.Q. for sensitive groups | 20 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.520% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.240% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Brookville, IN | 2,535 | 6 | 88.0% |
| Darrtown, OH | 550 | 6 | 88.0% |
| Hooven, OH | 326 | 54 | 8.0% |
| New Trenton, IN | 233 | 54 | 8.0% |
| New Haven, OH | 332 | 54 | 8.0% |
| New Haven CDP (Huron County), OH | 282 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Pisinemo, AZ | 282 | 47 | 6.0% |
| Loma Mar, CA | 282 | 35 | 30.0% |
| Pisgah, IA | 282 | 40 | 20.0% |
| Royal Lakes, IL | 282 | 54 | 8.0% |
| Evergreen, LA | 282 | 30 | 40.0% |
| New Haven CDP (Huron County), OH | 282 | 54 | 8.0% |
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