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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 36°F | 24°F | 0.9" |
| February | 15°F | 38°F | 26°F | 1.1" |
| March | 25°F | 49°F | 36°F | 2.1" |
| April | 28°F | 53°F | 39°F | 4.4" |
| May | 36°F | 63°F | 50°F | 6.6" |
| June | 47°F | 76°F | 61°F | 3.5" |
| July | 54°F | 85°F | 70°F | 3.1" |
| August | 52°F | 79°F | 65°F | 5.8" |
| September | 43°F | 73°F | 58°F | 2.5" |
| October | 34°F | 58°F | 45°F | 1.7" |
| November | 24°F | 48°F | 35°F | 0.8" |
| December | 14°F | 34°F | 23°F | 1.0" |
| Index | Newcastle | Wyoming | National |
| Air quality index | 44 | 39 | 42 |
| Pollution index | 1,968,790 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 274 |
| Days with moderate air quality | 87 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Osage, WY | 47 | 40 | 20.0% |
| Hill View Heights, WY | 65 | 44 | 12.0% |
| Newcastle, WY | 3,395 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Kenedy, TX | 3,394 | 31 | 38.0% |
| North Great River, NY | 3,396 | 43 | 14.0% |
| Saint-Pascal, QC | 3,396 | n/a | |
| Clayton, DE | 3,393 | 42 | 16.0% |
| Frontenac, KS | 3,398 | 37 | 26.0% |
| Newcastle, WY | 3,395 | 44 | 12.0% |
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