What is the hottest month in Fort Benton?

July is the warmest month in Fort Benton, with an average high of 86.4°F.

What is the coldest month in Fort Benton?

January is the coldest month in Fort Benton, with an average low of 10.1°F.

What month does Fort Benton get the most rain?

June is typically the wettest month in Fort Benton, with about 2.62 inches of precipitation.

What plant hardiness zone is Fort Benton in?

Fort Benton is approximately in USDA plant hardiness Zone 6b, based on the average annual extreme minimum temperature.

Has the climate in Fort Benton changed recently?

13.4% of Fort Benton'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.

Fort Benton, MT

Climate overview — based on NOAA 1991-2020 normals from FT BENTON, MT US.

BSk Semi-arid (cold) climate 6b USDA hardiness Zone 6b

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Fort Benton has an annual average temperature of 45.4°F with about 13.2 inches of precipitation per year and 38.2 inches of snow. The warmest month is July (average high 86.4°F), and the coldest is January (average low 10.1°F). June is typically the wettest month (2.62 in) and February the driest (0.44 in). Snow typically falls from September through May.

Annual swing

48°F

warmest to coldest month

Heating need

7,335

HDD/yr

Cooling need

273

CDD/yr

Best time to visit Fort Benton

Full guide →

Climate change signal

All-time records →

49 of 366 (13.4%) of Fort Benton'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		10
1900s		11
1910s		14
1930s		12
1940s		27
1950s		36
1960s		39
1970s		22
1980s		53
1990s		51
2000s		31
2010s		33
2020s		27

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	34.6°F	10.1°F	22.3°F	0.52 in	7.9 in	5
February	38.1°F	12.6°F	25.3°F	0.44 in	6.9 in	6
March	48.2°F	20.3°F	34.3°F	0.56 in	4.3 in	6
April	58.6°F	30.6°F	44.6°F	1.48 in	3.0 in	8
May	68.3°F	40.6°F	54.4°F	2.08 in	0.3 in	10
June	76.3°F	48.6°F	62.5°F	2.62 in	—	11
July	86.4°F	54.1°F	70.3°F	1.19 in	—	6
August	85.5°F	52.1°F	68.8°F	1.16 in	—	6
September	74.2°F	42.3°F	58.3°F	1.20 in	0.3 in	7
October	59.9°F	30.5°F	45.2°F	0.92 in	1.9 in	7
November	46.5°F	21.0°F	33.7°F	0.58 in	5.7 in	6
December	36.7°F	13.1°F	24.9°F	0.47 in	7.9 in	5