Climate and monthly weather forecastRockville, VA
Climate and monthly weather forecast
Weather in January
January, the same as December, in Rockville, Virginia, is another chilly winter month, with temperature in the range of an average high of 44.2°F (6.8°C) and an average low of 29.5°F (-1.4°C). In Rockville, the lowest temperatures are generally noted in January, averaging a high of 44.2°F (6.8°C) and a low of 29.5°F (-1.4°C). Weather in January »Weather in February
February, the last month of the winter in Rockville, is another chilly month, with temperature in the range of an average low of 31.8°F (-0.1°C) and an average high of 49.1°F (9.5°C). Rockville sees the arrival of February with an average high-temperature of a still frosty 49.1°F (9.5°C), indicating a subtle variation from January. Weather in February »Weather in March
March, the first month of the spring in Rockville, is a moderate month, with an average temperature ranging between max 55.9°F (13.3°C) and min 38.8°F (3.8°C). A gentle upsurge in temperatures occurs as February gives way to March, with average highs shifting from a chilly 49.1°F (9.5°C) to a mild 55.9°F (13.3°C). Weather in March »Weather in April
April is an agreeable spring month in Rockville, Virginia, with an average temperature fluctuating between 49.1°F (9.5°C) and 68.2°F (20.1°C). As April arrives, Rockville's weather shows an increase in high-temperatures, moving from March's refreshing 55.9°F (13.3°C) to a pleasant 68.2°F (20.1°C). Weather in April »Weather in May
The last month of the spring, May, is a moderately hot month in Rockville, Virginia, with temperature in the range of an average low of 58.1°F (14.5°C) and an average high of 78.1°F (25.6°C). May shows a rise in the average high-temperature, moving from April's agreeable 68.2°F (20.1°C) to a moderately hot 78.1°F (25.6°C). Weather in May »Weather in June
June, the first month of the summer in Rockville, is also a moderately hot month, with temperature in the range of an average low of 65.3°F (18.5°C) and an average high of 85.6°F (29.8°C). As Rockville welcomes June, the average high-temperature sees a modest rise, transitioning from 78.1°F (25.6°C) in May to a still moderately hot 85.6°F (29.8°C). Weather in June »Weather in July
July in Rockville, Virginia, is a hot summer month, with an average temperature varying between 90.7°F (32.6°C) and 69.6°F (20.9°C). Rockville's temperature records reveal July as the warmest month, marked by average highs of 90.7°F (32.6°C) and lows of 69.6°F (20.9°C). July's heat index is computed to be a blistering 105.8°F (41°C). Weather in July »Weather in August
August, the last month of the summer in Rockville, is another hot month, with an average temperature varying between 68.2°F (20.1°C) and 88.3°F (31.3°C). The shift into August records an average high-temperature of a still hot 88.3°F (31.3°C), subtly varied from July's 90.7°F (32.6°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Rockville, Virginia, with an average temperature fluctuating between 81.3°F (27.4°C) and 62.6°F (17°C). With the commencement of September, Rockville records a moderate temperature decline, with the average high easing from August's tropical 88.3°F (31.3°C) to a warm 81.3°F (27.4°C). Weather in September »Weather in October
October, the same as September, in Rockville, Virginia, is another pleasant autumn month, with an average temperature varying between 51.8°F (11°C) and 69.3°F (20.7°C). October is characterized by a reduction in the average high-temperature, from a warm 81.3°F (27.4°C) in September to a pleasant 69.3°F (20.7°C). Weather in October »Weather in November
The last month of the autumn, November, is another mild month in Rockville, Virginia, with temperature in the range of an average high of 56.7°F (13.7°C) and an average low of 40.6°F (4.8°C). Rockville's November weather comes with a decrease in average high-temperatures, moving from a pleasant 69.3°F (20.7°C) in October to a refreshing 56.7°F (13.7°C). Weather in November »Weather in December
December, the first month of the winter in Rockville, is also a frosty month, with an average temperature varying between 49.1°F (9.5°C) and 34.9°F (1.6°C). December marks a gentle change in average high-temperature, declining from November's refreshing 56.7°F (13.7°C) to a frosty 49.1°F (9.5°C). Weather in December »Updated: Aug 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Rockville, January records the average lowest temperatures, peaking at 44.2°F (6.8°C) and reaching a low of 29.5°F (-1.4°C).
Throughout the year, there are 151.1 rainfall days, and 26.22" (666mm) of precipitation is accumulated.
Months with snowfall are January through April, November and December.
Throughout the year, there are 10.5 snowfall days, and 6.42" (163mm) of snow is accumulated.
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
The month with the most snowfall is February, when snow falls for 3.5 days and typically aggregates up to 1.77" (45mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
May through October are months without snowfall.
June has the longest days of the year, with an average of 14h and 42min of daylight.
Rockville witnesses the warmest weather in July, with temperatures averaging a high of 90.7°F (32.6°C) and a low of 69.6°F (20.9°C).
The least humid month is July, with an average relative humidity of 68%.
With an average of 10.6h of sunshine, July has the most sunshine of the year.
The month with the highest UV index is July, with an average maximum UV index of 7.
The month with the most rainfall is August, when the rain falls for 15.1 days and typically aggregates up to 2.72" (69mm) of precipitation.
September is the month with the least rainfall in Rockville. Rain falls for 12.5 days and accumulates 1.65" (42mm) of precipitation.
With an average relative humidity of 78%, December is the most humid month in Rockville, Virginia.
With an average of 9h and 36min of daylight, December has the shortest days of the year in Rockville.
The month with the least sunshine is December, with an average of 5.2h of sunshine.
Average temperature
Rockville, VA
The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (44.2°F).
The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).
Average pressure
Rockville, VA
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
30"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.04"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed
Rockville, VA
- Average wind speed in January:
6.6mph - Average wind speed in February:
6.8mph - Average wind speed in March:
7mph - Average wind speed in April:
7.4mph - Average wind speed in May:
6.3mph - Average wind speed in June:
5.9mph
- Average wind speed in July:
5.4mph - Average wind speed in August:
5.2mph - Average wind speed in September:
5.7mph - Average wind speed in October:
6.2mph - Average wind speed in November:
6.2mph - Average wind speed in December:
6mph
The windiest month (with the highest average wind speed) is April (7.4mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity
Rockville, VA
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (68%).
Average rainfall
Rockville, VA
- Average rainfall in January:
1.89" - Average rainfall in February:
2.05" - Average rainfall in March:
2.32" - Average rainfall in April:
2.36" - Average rainfall in May:
2.36" - Average rainfall in June:
2.24"
- Average rainfall in July:
2.32" - Average rainfall in August:
2.72" - Average rainfall in September:
1.65" - Average rainfall in October:
2.2" - Average rainfall in November:
2.17" - Average rainfall in December:
1.93"
The wettest month (with the highest rainfall) is August (2.72").
The driest month (with the least rainfall) is September (1.65").
Average rainfall days
Rockville, VA
- Average rainfall days in January:
9.6 days - Average rainfall days in February:
10.2 days - Average rainfall days in March:
14.1 days - Average rainfall days in April:
15 days - Average rainfall days in May:
16.6 days - Average rainfall days in June:
13.9 days
- Average rainfall days in July:
14.7 days - Average rainfall days in August:
15.1 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
8.8 days - Average rainfall days in December:
10.1 days
The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is November (8.8 days).
Average snowfall
Rockville, VA
The month with the highest snowfall is February (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Rockville, VA
- Average snowfall days in January:
3.3 days - Average snowfall days in February:
3.5 days - Average snowfall days in March:
1.5 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.4 days - Average snowfall days in December:
1.5 days
The month with the highest number of snowfall days is February (3.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Rockville, VA
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 12min - Average daylight in June:
14h and 42min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 12min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
5h and 24min - Average sunshine in February:
5h and 18min - Average sunshine in March:
6h and 36min - Average sunshine in April:
9h and 6min - Average sunshine in May:
9h and 12min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 12min - Average sunshine in September:
8h and 42min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days
Rockville, VA
- Average sunshine days in January:
18.4 days - Average sunshine days in February:
15.2 days - Average sunshine days in March:
14.6 days - Average sunshine days in April:
13.7 days - Average sunshine days in May:
11.9 days - Average sunshine days in June:
14.2 days
- Average sunshine days in July:
14.4 days - Average sunshine days in August:
13.3 days - Average sunshine days in September:
15.8 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
19.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (11.9 days).
Average UV index
Rockville, VA
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Rockville, VA
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility
Rockville, VA
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
