Climate
Located in the heart of the Boise Valley and at an elevation of 2,440-2,470 feet, Nampa enjoys a mild climate year round. Its high desert location is bordered to the north by the Front Range of the Rocky Mountains and to the south by the Owyhee Mountains. On average, there are 210 sunny days per year in Nampa, ID.
| Climate | Nampa, ID |
|---|---|
| Annual Rainfall (inches) | 11.6 |
| Max. Rainfall within 24 hours (inches) | 1-2 |
| Annual Snowfall (inches) | 19.1 |
| Max. Snowfall within 24 hours (inches) | 3-4 |
| Precipitation Days | 86 |
| Number of days of elevated smog conditions | Low |
| Number of days of poor visibility and low ceiling | January is month with lowest average visibility at 6.1 miles. July visibility averages 10 miles. |
| Prevailing winds direction | 27% from SE, 22% from the NW, & 10% from W |
| Mean wind speed by month | January 7mph, April 9mph, July 8mph, October 7mph |
| Peak gust speed by month and year | Highest average wind speed of 9mph occurs around March 25, where average daily max is 17mph. Over course of year, wind speeds vary from 0-17mph, rarely exceeding 24mph |
| Sunny Days | 210 |
| Avg. July High | 91 |
| Avg. Jan Low | 21.1 |
| Humidity Factors By Month | Low Humidity. Highest levels in winter. January - 67%, April 30%, July 17%, October 30% |
| UV Index | 4 |
| Elevation ft. | 2440-2470 |
| Natural Disaster | Frequency | Severity/Rating |
|---|---|---|
| Floods | Rare | |
| Tornadoes | No historical tornado events | Tornado Index Boise City/Nampa 12.94 US 136.45 |
| Hail Storms | Rare | |
| Hurricanes | Rare | |
| Other Major Storms | In past 60 years - Rare thunderstorms with wind and hail Wildfire, in region | |
| Earthquakes | Rare | No historical earthquakes above 3.5 magnitude or above |