Least humid places in the US in September
Ranked by the lowest mean dew point in September (hourly normals; cities with an hourly station only). First: Reno, NV (34°F), of 343 cities.
| Rank | City | Mean dew point | High | Wet days |
|---|---|---|---|---|
| 1 | Reno, NV | 34°F | 84°F | 2 |
| 2 | Steamboat Springs, CO | 35°F | 74°F | 10 |
| 3 | South Lake Tahoe, CA | 35°F | 73°F | 2 |
| 4 | Incline Village, NV | 35°F | 70°F | 2 |
| 5 | Casper, WY | 35°F | 76°F | 7 |
| 6 | Fairbanks, AK | 36°F | 55°F | 11 |
| 7 | Flagstaff, AZ | 36°F | 74°F | 8 |
| 8 | Grand Canyon Village, AZ | 36°F | 77°F | 6 |
| 9 | Keystone, SD | 37°F | 69°F | 7 |
| 10 | Great Falls, MT | 37°F | 72°F | 7 |
| 11 | Cheyenne, WY | 37°F | 73°F | 7 |
| 12 | Page, AZ | 37°F | 87°F | 4 |
| 13 | Gillette, WY | 37°F | 75°F | 6 |
| 14 | Boise, ID | 38°F | 80°F | 4 |
| 15 | Las Vegas, NV | 38°F | 95°F | 2 |
| 16 | Lancaster, CA | 38°F | 91°F | 1 |
| 17 | Palmdale, CA | 38°F | 93°F | 1 |
| 18 | Victorville, CA | 38°F | 91°F | 1 |
| 19 | Centennial, CO | 39°F | 77°F | 6 |
| 20 | Highlands Ranch, CO | 39°F | 76°F | 7 |
| 21 | Billings, MT | 39°F | 75°F | 7 |
| 22 | Boulder, CO | 39°F | 79°F | 8 |
| 23 | Fort Collins, CO | 39°F | 77°F | 7 |
| 24 | Greeley, CO | 39°F | 82°F | 6 |
| 25 | Arvada, CO | 39°F | 79°F | 7 |
Which states lead
Colorado (7 of the top 25), California (4 of the top 25), Nevada (3 of the top 25), then 6 more states. The top 25 range from 34°F to 39°F; the median across all 343 cities is 56°F.
The other end: most humid in September
- Key West, FL75°F
- Key Largo, FL75°F
- Miami, FL74°F
- Fort Lauderdale, FL74°F
- West Palm Beach, FL74°F
Least humid places through the year
| Month | First place | Mean dew point |
|---|---|---|
| January | Fairbanks, AK | -7°F |
| February | Fairbanks, AK | -3°F |
| March | Fairbanks, AK | 2°F |
| April | Fairbanks, AK | 19°F |
| May | Flagstaff, AZ | 24°F |
| June | Flagstaff, AZ | 26°F |
| July | Reno, NV | 39°F |
| August | Reno, NV | 37°F |
| September | Reno, NV | 34°F |
| October | Fairbanks, AK | 20°F |
| November | Fairbanks, AK | 1°F |
| December | Fairbanks, AK | -7°F |
343 cities with data for this measure. Folded suburbs share their lead city's values and are not listed separately. Methodology.