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.

ClimateNampa, 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 Days86
Number of days of elevated smog conditionsLow
Number of days of poor visibility and low ceilingJanuary is month with lowest average visibility at 6.1 miles. July visibility averages 10 miles.
Prevailing winds direction27% from SE, 22% from the NW, & 10% from W
Mean wind speed by monthJanuary 7mph, April 9mph, July 8mph, October 7mph
Peak gust speed by month and yearHighest 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 Days210
Avg. July High91
Avg. Jan Low21.1
Humidity Factors By MonthLow Humidity. Highest levels in winter. January - 67%, April 30%, July 17%, October 30%
UV Index4
Elevation ft.2440-2470

Natural DisasterFrequencySeverity/Rating
TornadoesNo historical tornado eventsTornado Index
Boise City/Nampa 12.94
US 136.45
Hail StormsRare
Other Major StormsIn past 60 years - Rare thunderstorms with wind and hail
Wildfire, in region

EarthquakesRareNo historical earthquakes above 3.5 magnitude or above