What is the hottest month in West Union?

July is the warmest month in West Union, with an average high of 81.6°F.

What is the coldest month in West Union?

January is the coldest month in West Union, with an average low of 6.2°F.

What month does West Union get the most rain?

June is typically the wettest month in West Union, with about 5.91 inches of precipitation.

What plant hardiness zone is West Union in?

West Union is approximately in USDA plant hardiness Zone 6a, based on the average annual extreme minimum temperature.

Has the climate in West Union changed recently?

9.3% of West Union'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.

West Union, IA

Climate overview — based on NOAA 1991-2020 normals from FAYETTE, IA US.

Dfb Warm-summer humid continental climate 6a USDA hardiness Zone 6a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

West Union has an annual average temperature of 45°F with about 39.5 inches of precipitation per year and 41.1 inches of snow. The warmest month is July (average high 81.6°F), and the coldest is January (average low 6.2°F). June is typically the wettest month (5.91 in) and February the driest (1.21 in). Snow typically falls from October through April.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

55.2°F

warmest to coldest month

Heating need

7,527

HDD/yr

Cooling need

330

CDD/yr

Best time to visit West Union

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Climate change signal

All-time records →

34 of 366 (9.3%) of West Union'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		35
1900s		19
1910s		24
1920s		34
1930s		71
1940s		21
1950s		12
1960s		10
1970s		9
1980s		32
1990s		17
2000s		29
2010s		30
2020s		23

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	24.5°F	6.2°F	15.3°F	1.22 in	10.8 in	7
February	29.0°F	9.4°F	19.2°F	1.21 in	9.9 in	7
March	42.3°F	21.9°F	32.1°F	2.06 in	5.4 in	8
April	57.1°F	33.3°F	45.2°F	4.13 in	1.8 in	11
May	69.1°F	45.3°F	57.2°F	5.05 in	—	13
June	78.5°F	55.8°F	67.2°F	5.91 in	—	12
July	81.6°F	59.5°F	70.5°F	5.32 in	—	10
August	79.8°F	56.8°F	68.3°F	4.13 in	—	9
September	73.5°F	48.1°F	60.8°F	3.87 in	—	9
October	60.3°F	36.3°F	48.3°F	2.90 in	0.3 in	9
November	43.9°F	24.4°F	34.1°F	2.06 in	2.7 in	7
December	30.5°F	13.3°F	21.9°F	1.65 in	10.2 in	8