What is the hottest month in Henderson?

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

What is the coldest month in Henderson?

January is the coldest month in Henderson, with an average low of 27.6°F.

What month does Henderson get the most rain?

August is typically the wettest month in Henderson, with about 4.92 inches of precipitation.

What plant hardiness zone is Henderson in?

Henderson is approximately in USDA plant hardiness Zone 8a, based on the average annual extreme minimum temperature.

Has the climate in Henderson changed recently?

9.6% of Henderson'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.

Henderson, MD

Climate overview — based on NOAA 1991-2020 normals from DOVER, DE US.

Cfa Humid subtropical climate 8a USDA hardiness Zone 8a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Henderson has an annual average temperature of 57.1°F with about 47.6 inches of precipitation per year and 13.2 inches of snow. The warmest month is July (average high 86.9°F), and the coldest is January (average low 27.6°F). August is typically the wettest month (4.92 in) and February the driest (3.08 in). Snow typically falls from December through March.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

41.9°F

warmest to coldest month

Heating need

3,981

HDD/yr

Cooling need

1,122

CDD/yr

Best time to visit Henderson

Full guide →

Climate change signal

All-time records →

35 of 366 (9.6%) of Henderson'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		13
1910s		34
1920s		40
1930s		32
1940s		41
1950s		34
1960s		18
1970s		30
1980s		24
1990s		31
2000s		17
2010s		30
2020s		16

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	44.4°F	27.6°F	36.0°F	3.43 in	4.1 in	10
February	47.4°F	29.0°F	38.2°F	3.08 in	5.9 in	9
March	54.5°F	35.4°F	45.0°F	4.21 in	0.6 in	10
April	66.0°F	44.9°F	55.5°F	3.72 in	—	10
May	74.4°F	54.4°F	64.4°F	3.89 in	—	11
June	82.7°F	63.8°F	73.2°F	4.56 in	—	9
July	86.9°F	69.0°F	77.9°F	4.14 in	—	9
August	85.1°F	67.3°F	76.2°F	4.92 in	—	8
September	79.2°F	61.0°F	70.1°F	4.25 in	—	8
October	68.9°F	49.5°F	59.2°F	4.06 in	—	8
November	58.0°F	39.3°F	48.7°F	3.36 in	—	7
December	48.6°F	32.1°F	40.3°F	3.99 in	2.6 in	10