| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 33°F | 26°F | 1.3" |
| February | 24°F | 41°F | 32°F | 1.0" |
| March | 30°F | 54°F | 41°F | 1.4" |
| April | 35°F | 64°F | 49°F | 0.8" |
| May | 43°F | 74°F | 59°F | 1.3" |
| June | 50°F | 81°F | 66°F | 1.3" |
| July | 57°F | 92°F | 75°F | 0.5" |
| August | 56°F | 91°F | 73°F | 0.3" |
| September | 47°F | 80°F | 63°F | 0.4" |
| October | 37°F | 62°F | 49°F | 1.2" |
| November | 28°F | 45°F | 36°F | 1.4" |
| December | 20°F | 33°F | 26°F | 1.8" |
| Index | Republic | Washington | National |
| Air quality index | 43 | 36 | 42 |
| Pollution index | 2,800,290 | 4,541,850 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 252 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Malo, WA | 45 | 43 | 14.0% |
| Pine Grove, WA | 84 | 43 | 14.0% |
| Torboy, WA | 154 | 43 | 14.0% |
| Curlew Lake, WA | 579 | 43 | 14.0% |
| Republic, WA | 1,144 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| St. Ansgar, IA | 1,144 | 15 | 70.0% |
| Camp Point, IL | 1,144 | 41 | 18.0% |
| East Marion, NY | 1,144 | 37 | 26.0% |
| Mooreland, OK | 1,144 | 15 | 70.0% |
| Curtisville, PA | 1,144 | 56 | 12.0% |
| Republic, WA | 1,144 | 43 | 14.0% |
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