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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 46°F | 34°F | 2.7" |
| February | 25°F | 48°F | 36°F | 2.1" |
| March | 33°F | 58°F | 45°F | 3.2" |
| April | 43°F | 71°F | 56°F | 3.7" |
| May | 52°F | 78°F | 65°F | 5.6" |
| June | 61°F | 86°F | 74°F | 4.5" |
| July | 66°F | 90°F | 78°F | 4.2" |
| August | 65°F | 88°F | 76°F | 2.8" |
| September | 58°F | 82°F | 69°F | 3.5" |
| October | 46°F | 71°F | 58°F | 5.4" |
| November | 35°F | 59°F | 46°F | 2.6" |
| December | 29°F | 50°F | 39°F | 3.8" |
| Index | Cascades | Virginia | National |
| Air quality index | 47 | 58 | 42 |
| Pollution index | 14,693,900 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 209 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.190% |
| Benzene | 0.210% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.060% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Bull Run Mountain Estates, VA | 1,777 | 38 | 24.0% |
| Hamilton, VA | 708 | 38 | 24.0% |
| Woodburn, VA | 10,081 | 38 | 24.0% |
| South Riding, VA | 32,526 | 47 | 6.0% |
| Gaithersburg, MD | 67,878 | 47 | 6.0% |
| Cascades, VA | 12,132 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Sylacauga, AL | 12,132 | 38 | 24.0% |
| Baraboo, WI | 12,133 | 35 | 30.0% |
| Lake Tapps, WA | 12,129 | 45 | 10.0% |
| Fortuna, CA | 12,135 | 27 | 46.0% |
| Somerville, NJ | 12,139 | 41 | 18.0% |
| Cascades, VA | 12,132 | 47 | 6.0% |
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