What is the hottest month in Basalt?

July is the warmest month in Basalt, with an average high of 86.9°F.

What is the coldest month in Basalt?

January is the coldest month in Basalt, with an average low of 16.8°F.

What month does Basalt get the most rain?

May is typically the wettest month in Basalt, with about 1.75 inches of precipitation.

What plant hardiness zone is Basalt in?

Basalt is approximately in USDA plant hardiness Zone 7a, based on the average annual extreme minimum temperature.

Has the climate in Basalt changed recently?

13.4% of Basalt's all-time daily heat records were set in the last decade (since 2015), compared to roughly 5% if records were evenly distributed over time.

Basalt, ID

Climate overview — based on NOAA 1991-2020 normals from BLACKFOOT FIRE DEPT, ID US.

BSk Semi-arid (cold) climate 7a USDA hardiness Zone 7a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Basalt has an annual average temperature of 47.2°F with about 12.1 inches of precipitation per year and 14.7 inches of snow. The warmest month is July (average high 86.9°F), and the coldest is January (average low 16.8°F). May is typically the wettest month (1.75 in) and July the driest (0.50 in). Snow typically falls from October through April.

Annual swing

47.4°F

warmest to coldest month

Heating need

6,762

HDD/yr

Cooling need

345

CDD/yr

Best time to visit Basalt

Full guide →

Climate change signal

All-time records →

49 of 366 (13.4%) of Basalt's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.

1890s		23
1900s		46
1910s		26
1920s		10
1930s		32
1940s		32
1950s		42
1960s		25
1970s		13
1980s		26
1990s		11
2000s		20
2010s		28
2020s		32

Bars: number of all-time daily heat records still standing that were set in each decade.

Monthly averages

Month	Avg High	Avg Low	Avg Temp	Precipitation	Snow	Rainy days
January	31.2°F	16.8°F	24.0°F	0.99 in	6.0 in	8
February	37.0°F	20.5°F	28.8°F	0.73 in	2.2 in	7
March	48.8°F	29.1°F	39.0°F	1.10 in	0.3 in	7
April	57.4°F	34.7°F	46.1°F	1.40 in	0.7 in	9
May	67.6°F	42.8°F	55.2°F	1.75 in	—	8
June	76.7°F	49.8°F	63.2°F	1.03 in	—	6
July	86.9°F	56.0°F	71.4°F	0.50 in	—	3
August	85.9°F	54.2°F	70.1°F	0.60 in	—	3
September	75.1°F	46.0°F	60.6°F	0.97 in	—	4
October	60.5°F	35.0°F	47.8°F	1.12 in	0.8 in	6
November	44.8°F	25.5°F	35.1°F	0.75 in	1.4 in	5
December	32.1°F	17.5°F	24.8°F	1.11 in	3.3 in	8