Weather & Climate in Nampa, ID

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Nampa experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 33°F in January while summers reach 82°F in July. The area gets 302 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 15.2 inches (drier than the 38-inch national average). The area receives 21.1 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 33. The city sits at an elevation of 2,470 feet.

Temperature

33°F Jan (0°C) 82°F Jul (28°C)

Annual Average	53.6°F
	1% below US avg
January Average	33°F (0°C)
July Average	82°F (28°C)
Sunny Days	302 days/yr

Geography

Elevation	2,470 ft (753 m)
Area	35.9 sq mi (93.0 km²)
Population Density	2,959/sq mi
Coordinates	43.5855°N, 116.5656°W
Timezone	America/Boise
County	Canyon County County
Nearest Airport	Boise Air Trml/Gowen Field (BOI) 17 miles away

Precipitation & Snow

Annual Rainfall 15.2"

60% below US avg

Snowfall 21.1"

Wettest Month (Jan) 1.30"

Driest Month (Jul) 0.28"

Air Quality

AQI Median	33.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	71.7 / 100
Social Vulnerability	18.5 / 100
Community Resilience	42.4 / 100

Hazard Breakdown

Tornado	Very Low
Earthquake	Relatively Low
Wildfire	Relatively Moderate
Flood	Relatively Moderate
Hail	Relatively Low
Strong Wind	Relatively Moderate
Heat Wave	Relatively Moderate
Winter Weather	Very High
Lightning	Relatively High
Ice Storm	Relatively Moderate
Drought	Very Low
Cold Wave	Relatively Low
Landslide	Very Low
Volcano	Very Low
Avalanche	Very Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

1,104 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.9.

Feb 26, 2024	10 km N of Smiths Ferry, Idaho	M4.9	97 km	12 km
Apr 1, 2020	21 km WNW of Stanley, Idaho	M4.8	139 km	10 km
Jun 25, 2020	27 km NW of Stanley, Idaho	M4.6	143 km	8 km
May 14, 2020	31 km NW of Stanley, Idaho	M4.4	142 km	13 km
Apr 1, 2020	23 km NW of Stanley, Idaho	M4.4	140 km	7 km
May 21, 2020	26 km NW of Stanley, Idaho	M4.4	144 km	6 km
Jun 14, 2020	10 km NW of Stanley, Idaho	M4.2	144 km	8 km
Jun 9, 2020	11 km NW of Stanley, Idaho	M4.2	146 km	10 km
Apr 11, 2020	20 km NW of Stanley, Idaho	M4.1	141 km	10 km
Jul 10, 2020	18 km SW of Stanley, Idaho	M4.1	132 km	10 km
Apr 21, 2020	29 km NW of Stanley, Idaho	M4.1	144 km	10 km
Jun 3, 2025	17 km NNW of Stanley, Idaho	M4.0	150 km	10 km
Apr 3, 2020	20 km NW of Stanley, Idaho	M4.0	140 km	10 km
Oct 27, 1994	11 km SE of Halfway, Oregon	M4.0	141 km	10 km
Apr 1, 2020	18 km NW of Stanley, Idaho	M4.0	142 km	14 km
Jan 1, 2021	15 km SSW of Stanley, Idaho	M3.9	139 km	3 km
Apr 3, 2020	26 km NW of Stanley, Idaho	M3.9	140 km	15 km
Jul 10, 2020	14 km SW of Stanley, Idaho	M3.9	135 km	14 km
Jul 3, 2020	26 km NW of Stanley, Idaho	M3.9	143 km	10 km
Apr 1, 2020	28 km NW of Stanley, Idaho	M3.9	139 km	10 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

41 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF1. Total: 1 injury.

Date	Rating	Distance	Path	Fatalities
Apr 30, 1997	EF1	65 km	3.0 mi	0
May 17, 1996	EF1	46 km	0.3 mi	0
May 17, 1996	EF1	81 km	5.5 mi	0
Jun 19, 1991	EF1	32 km	0.1 mi	0
Jul 9, 1990	EF1	89 km	0.1 mi	0
Oct 26, 1984	EF1	16 km	0.3 mi	0
Mar 21, 1984	EF1	20 km	0.1 mi	0
Jul 1, 1983	EF1	53 km	2.0 mi	0
Apr 23, 1974	EF1	48 km	1.0 mi	0
Jun 23, 1969	EF1	81 km	1.0 mi	0
Aug 25, 1966	EF1	46 km	19.1 mi	0
Jul 9, 1956	EF1	14 km	0.1 mi	0
May 27, 2023	EF0	81 km	5.0 mi	0
May 26, 2023	EF0	16 km	1.0 mi	0
May 27, 2022	EF0	25 km	3.8 mi	0
May 26, 2013	EF0	71 km	3.9 mi	0
Aug 25, 2004	EF0	33 km	—	0
Aug 25, 2004	EF0	19 km	—	0
Apr 6, 2003	EF0	1 km	1.0 mi	0
Sep 29, 2002	EF0	32 km	1.0 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Nearby Volcanoes

3 volcanoes within 200 km. Closest: Jordan Craters (87 km).

Name	Type	Elevation	Last Eruption	Distance
Jordan Craters	Volcanic field	1,473 m (4,833 ft)	-1250	87 km
Black Butte Crater Lava Field	Shield	1,478 m (4,849 ft)	-8400	184 km
Diamond Craters	Volcanic field	1,435 m (4,708 ft)	-5610	185 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: SODA (282,888 acres, 2015).

Year	Name	Acres Burned	Distance
2015	SODA	282,888	38 km
1992	FOOTHILLS	228,631	70 km
2016	PIONEER	189,596	100 km
2024	PADDOCK	186,842	61 km
2013	PONY COMPLEX	148,188	77 km
2012	TRINITY RIDGE	141,807	95 km
2013	ELK COMPLEX	129,565	88 km
2024	HOLE IN THE GROUND	98,055	94 km
2000	JACKSON	80,733	81 km
2006	CHERRY	56,773	58 km
1996	BOGUS CREEK	56,721	97 km
2006	RATTLESNAKE COMPLEX	48,330	100 km
2013	OWYHEE	48,001	50 km
2002	TRIMBLY CREEK	43,085	41 km
1986	BISSELL CK	40,847	46 km
1986	VAN DUSEN	39,901	51 km
2022	WILLOW CREEK	38,585	85 km
2016	CHERRY ROAD	35,219	54 km
2002	MAHOGANY COMPLEX (ATKINS BUTTE)	33,472	59 km
2000	OREGON TRAIL	31,575	92 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	33°F (0°C)	1.3 in	Wettest
February	36°F (2°C)	1.0 in
March	44°F (7°C)	1.2 in
April	51°F (10°C)	1.1 in
May	59°F (15°C)	0.9 in
June	67°F (19°C)	0.8 in
July	82°F (28°C)	0.3 in	Warmest, Driest
August	72°F (22°C)	0.4 in
September	62°F (17°C)	0.7 in
October	52°F (11°C)	0.8 in
November	39°F (4°C)	1.3 in
December	31°F (-1°C)	1.2 in	Coldest

Nampa has a seasonal temperature swing of 52°F / from 31°F in December to 82°F in July. Total annual precipitation is 10.9 inches, with January being the wettest month (1.3") and July the driest (0.3").

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