What is the hottest month in Rockville?

July is the warmest month in Rockville, with an average high of 85.8°F.

What is the coldest month in Rockville?

January is the coldest month in Rockville, with an average low of 17.2°F.

What month does Rockville get the most rain?

June is typically the wettest month in Rockville, with about 5.45 inches of precipitation.

What plant hardiness zone is Rockville in?

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

Has the climate in Rockville changed recently?

8.7% of Rockville'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.

Rockville, IN

Climate overview — based on NOAA 1991-2020 normals from ROCKVILLE, IN US.

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Rockville has an annual average temperature of 52°F with about 47.4 inches of precipitation per year and 13 inches of snow. The warmest month is July (average high 85.8°F), and the coldest is January (average low 17.2°F). June is typically the wettest month (5.45 in) and February the driest (2.60 in). Snow typically falls from November through March.

Pleasant months

1 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

47.4°F

warmest to coldest month

Heating need

5,382

HDD/yr

Cooling need

693

CDD/yr

Best time to visit Rockville

Full guide →

Climate change signal

All-time records →

32 of 366 (8.7%) of Rockville'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		33
1900s		14
1910s		49
1920s		26
1930s		65
1940s		21
1950s		30
1960s		12
1970s		13
1980s		24
1990s		17
2000s		16
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	35.7°F	17.2°F	26.5°F	3.38 in	5.1 in	8
February	41.1°F	20.6°F	30.9°F	2.60 in	2.8 in	7
March	52.3°F	29.3°F	40.8°F	3.32 in	1.1 in	8
April	65.8°F	39.7°F	52.8°F	4.96 in	0.1 in	10
May	75.6°F	49.7°F	62.7°F	5.02 in	—	11
June	83.5°F	58.4°F	71.0°F	5.45 in	—	10
July	85.8°F	62.0°F	73.9°F	4.70 in	—	9
August	84.6°F	60.0°F	72.3°F	3.84 in	—	8
September	79.2°F	52.7°F	65.9°F	3.14 in	—	6
October	66.9°F	41.6°F	54.2°F	3.87 in	—	8
November	52.1°F	31.4°F	41.7°F	3.90 in	0.3 in	8
December	39.8°F	22.2°F	31.0°F	3.25 in	3.6 in	9