| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 23°F | 2.0" |
| February | 16°F | 34°F | 25°F | 2.7" |
| March | 31°F | 50°F | 39°F | 5.0" |
| April | 41°F | 64°F | 51°F | 6.5" |
| May | 51°F | 75°F | 62°F | 4.6" |
| June | 61°F | 83°F | 71°F | 8.9" |
| July | 64°F | 85°F | 74°F | 4.5" |
| August | 61°F | 83°F | 72°F | 4.9" |
| September | 54°F | 78°F | 65°F | 3.6" |
| October | 43°F | 64°F | 53°F | 3.1" |
| November | 32°F | 50°F | 40°F | 2.9" |
| December | 20°F | 35°F | 28°F | 4.0" |
| Index | Elizabeth | Illinois | National |
| Air quality index | 29 | 41 | 50 |
| Pollution index | 2,182,880 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| The Galena Territory, IL | 1,241 | 29 | 42% |
| Warren, IL | 1,435 | 29 | 42% |
| Apple Canyon Lake, IL | 371 | 29 | 42% |
| Galena, IL | 3,402 | 29 | 42% |
| Apple River, IL | 451 | 29 | 42% |
| Elizabeth, IL | 771 | 29 | 42% |
| City, State | Population | Air Quality Index | National Avg. |
| Togiak, AK | 771 | 31 | 38% |
| New Tripoli, PA | 771 | 42 | 16% |
| Orderville, UT | 771 | 44 | 12% |
| Glasgow, WV | 771 | 40 | 20% |
| Middletown, CA | 771 | 31 | 38% |
| Elizabeth, IL | 771 | 29 | 42% |
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