What is the hottest month in Merrill?

July is the warmest month in Merrill, with an average high of 82.2°F.

What is the coldest month in Merrill?

January is the coldest month in Merrill, with an average low of 16.4°F.

What month does Merrill get the most rain?

August is typically the wettest month in Merrill, with about 3.85 inches of precipitation.

What plant hardiness zone is Merrill in?

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

Has the climate in Merrill changed recently?

10.1% of Merrill'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.

Merrill, MI

Climate overview — based on NOAA 1991-2020 normals from SAGINAW MBS INTL AP, MI US.

Dfa Hot-summer humid continental climate 7a USDA hardiness Zone 7a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Merrill has an annual average temperature of 48°F with about 32.1 inches of precipitation per year and 49 inches of snow. The warmest month is July (average high 82.2°F), and the coldest is January (average low 16.4°F). August is typically the wettest month (3.85 in) and February the driest (1.77 in). Snow typically falls from October through April.

Pleasant months

3 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

48.7°F

warmest to coldest month

Heating need

6,546

HDD/yr

Cooling need

435

CDD/yr

Best time to visit Merrill

Full guide →

Climate change signal

All-time records →

37 of 366 (10.1%) of Merrill'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		6
1900s		30
1910s		32
1920s		27
1930s		78
1940s		37
1950s		21
1960s		10
1970s		17
1980s		12
1990s		26
2000s		19
2010s		29
2020s		22

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	29.5°F	16.4°F	23.0°F	1.92 in	13.9 in	13
February	31.8°F	17.3°F	24.5°F	1.77 in	11.4 in	10
March	42.3°F	25.7°F	34.0°F	2.02 in	6.0 in	10
April	55.8°F	36.1°F	45.9°F	3.19 in	2.4 in	12
May	68.6°F	47.7°F	58.2°F	3.41 in	—	12
June	78.5°F	57.7°F	68.1°F	3.28 in	—	10
July	82.2°F	61.2°F	71.7°F	2.83 in	—	10
August	80.0°F	59.4°F	69.7°F	3.85 in	—	11
September	73.3°F	51.6°F	62.5°F	2.81 in	—	10
October	60.2°F	41.4°F	50.8°F	2.91 in	0.2 in	12
November	46.2°F	31.8°F	39.0°F	2.28 in	3.3 in	12
December	34.7°F	23.1°F	28.9°F	1.85 in	11.8 in	12