Climate and monthly weather forecastWest McLean, VA
Climate and monthly weather forecast
Weather in January
January, like December, in West McLean, Virginia, is an icy winter month, with an average temperature varying between 26.8°F (-2.9°C) and 40.1°F (4.5°C). January is the month when West McLean experiences its coldest temperatures, averaging a high of 40.1°F (4.5°C) and a low of 26.8°F (-2.9°C). Weather in January »Weather in February
February, the last month of the winter in West McLean, is a frosty month, with temperature in the range of an average high of 44.6°F (7°C) and an average low of 29.5°F (-1.4°C). West McLean signifies an average high-temperature of a frosty 44.6°F (7°C) in February, closely mirroring the 40.1°F (4.5°C) of January. Weather in February »Weather in March
March, the first month of the spring in West McLean, is a cool month, with temperature in the range of an average low of 36.9°F (2.7°C) and an average high of 52.7°F (11.5°C). The shift from February to March introduces a subtle increase in the average high-temperature, moving from a chilly 44.6°F (7°C) to a cool 52.7°F (11.5°C). Weather in March »Weather in April
April in West McLean, Virginia, is a comfortable spring month, with an average temperature varying between 64.9°F (18.3°C) and 46.6°F (8.1°C). April marks a rise in the average high-temperature, moving from March's cool 52.7°F (11.5°C) to a comfortable 64.9°F (18.3°C). Weather in April »Weather in May
May, the last month of the spring in West McLean, is a moderately hot month, with an average temperature fluctuating between 55.9°F (13.3°C) and 74.8°F (23.8°C). An escalation in the average high-temperature is seen with the onset of May, moving from a refreshing 64.9°F (18.3°C) in April to a warm 74.8°F (23.8°C). Weather in May »Weather in June
June, the first month of the summer in West McLean, is still a warm month, with an average temperature varying between 63.9°F (17.7°C) and 82.8°F (28.2°C). June brings a slight elevation in the average high-temperature, transitioning from May's moderately hot 74.8°F (23.8°C) to a still warm 82.8°F (28.2°C). Weather in June »Weather in July
July is a tropical summer month in West McLean, Virginia, with an average temperature varying between 69.1°F (20.6°C) and 87.4°F (30.8°C). July, with its average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 69.1°F (20.6°C), holds the record as the warmest month. For most parts of July, the heat index is appraised at a torrid 98.6°F (37°C). Weather in July »Weather in August
August, the last month of the summer in West McLean, is another warm month, with temperature in the range of an average low of 67.6°F (19.8°C) and an average high of 85.6°F (29.8°C). West McLean's August average high-temperature settles at a moderately hot 85.6°F (29.8°C), showing a near match with the preceding month. Weather in August »Weather in September
September, the first month of the autumn in West McLean, is also a moderately hot month, with temperature in the range of an average low of 61.2°F (16.2°C) and an average high of 78.6°F (25.9°C). September's onset introduces a mild reduction in the average high-temperature, from a warm 85.6°F (29.8°C) in August to a still moderately hot 78.6°F (25.9°C). Weather in September »Weather in October
October, the same as September, is another comfortable autumn month in West McLean, Virginia, with temperature in the range of an average high of 66.4°F (19.1°C) and an average low of 50.7°F (10.4°C). October suggests a modest reduction in the average high-temperature, shifting from a warm 78.6°F (25.9°C) in September to a comfortable 66.4°F (19.1°C). Weather in October »Weather in November
The last month of the autumn, November, is another cool month in West McLean, Virginia, with temperature in the range of an average high of 54.1°F (12.3°C) and an average low of 39°F (3.9°C). The transition into November involves a decrease in the average high-temperature, falling from an enjoyable 66.4°F (19.1°C) in October to a fresh 54.1°F (12.3°C). Weather in November »Weather in December
December, the first month of the winter in West McLean, is also a frosty month, with an average temperature varying between 45.5°F (7.5°C) and 33.1°F (0.6°C). With the beginning of December, the average high-temperature shows a small decrease, transitioning from a fresh 54.1°F (12.3°C) in November to a frosty 45.5°F (7.5°C). Weather in December »Updated: Jun 25, 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
During the coldest month in West McLean, January, temperatures average a high of 40.1°F (4.5°C) and a low of 26.8°F (-2.9°C).
The months with the least rainfall in West McLean are January and September Rain falls for 6 days and accumulates 0.51" (13mm) of rain.
Throughout the year, there are 109 rainfall days, and 9.29" (236mm) of precipitation is accumulated.
Months with snowfall are January through April, November and December.
The month with the most snowfall is January, when snow falls for 2.7 days and typically aggregates up to 0.98" (25mm) of snow.
Throughout the year, there are 10.3 snowfall days, and 2.28" (58mm) of snow is accumulated.
January, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
The months with the least sunshine are February and December, with an average of 5.1h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in West McLean, 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.
The months with the highest UV index are May through August, with an average maximum UV index of 6.
With an average of 14h and 54min of daylight, June has the longest days of the year.
July, with its high-temperature average of 87.4°F (30.8°C) and a low-temperature average of 69.1°F (20.6°C), is the warmest month.
July is the least humid month, with an average relative humidity of 70%.
The month with the most sunshine is July, with an average of 10.9h of sunshine.
August is the month with the most rainfall. Rain falls for 13 days and accumulates 1.5" (38mm) of precipitation.
The months with the highest humidity are October and December, with an average relative humidity of 76%.
The month with the shortest days is December, with an average of 9h and 30min of daylight.
Average temperature
West McLean, VA
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (40.1°F).
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).
Average pressure
West McLean, VA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.11"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
West McLean, VA
- Average wind speed in January:
7.4mph - Average wind speed in February:
7.5mph - Average wind speed in March:
7.7mph - Average wind speed in April:
7.6mph - Average wind speed in May:
6.3mph - Average wind speed in June:
5.7mph
- Average wind speed in July:
5mph - Average wind speed in August:
4.9mph - Average wind speed in September:
5.5mph - Average wind speed in October:
6.5mph - Average wind speed in November:
6.8mph - Average wind speed in December:
6.8mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity
West McLean, VA
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (70%).
Average rainfall
West McLean, VA
- Average rainfall in January:
0.51" - Average rainfall in February:
0.55" - Average rainfall in March:
0.63" - Average rainfall in April:
0.75" - Average rainfall in May:
0.75" - Average rainfall in June:
0.94"
- Average rainfall in July:
1.18" - Average rainfall in August:
1.5" - Average rainfall in September:
0.51" - Average rainfall in October:
0.67" - Average rainfall in November:
0.63" - Average rainfall in December:
0.67"
The wettest month (with the highest rainfall) is August (1.5").
The driest months (with the least rainfall) are January and September (0.51").
Average rainfall days
West McLean, VA
- Average rainfall days in January:
6 days - Average rainfall days in February:
6.3 days - Average rainfall days in March:
9.2 days - Average rainfall days in April:
10.8 days - Average rainfall days in May:
10.8 days - Average rainfall days in June:
11.3 days
- Average rainfall days in July:
13.5 days - Average rainfall days in August:
13 days - Average rainfall days in September:
8.1 days - Average rainfall days in October:
7.5 days - Average rainfall days in November:
5.6 days - Average rainfall days in December:
6.9 days
The month with the highest number of rainy days is July (13.5 days).
The month with the least rainy days is November (5.6 days).
Average snowfall
West McLean, VA
The month with the highest snowfall is January (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
West McLean, VA
- Average snowfall days in January:
2.7 days - Average snowfall days in February:
3.6 days - Average snowfall days in March:
2.3 days - Average snowfall days in April:
0.2 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:
0.3 days - Average snowfall days in December:
1.2 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
West McLean, VA
- Average daylight in January:
9h and 48min - 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 18min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - 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 6min - Average daylight in December:
9h and 30min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 12min - Average sunshine in February:
5h and 6min - Average sunshine in March:
6h and 48min - Average sunshine in April:
9h and 0min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 54min - Average sunshine in August:
10h and 18min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 48min - Average sunshine in December:
5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days
West McLean, VA
- Average sunshine days in January:
22.1 days - Average sunshine days in February:
18.3 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
16.8 days - Average sunshine days in May:
16.6 days - Average sunshine days in June:
15.9 days
- Average sunshine days in July:
14.3 days - Average sunshine days in August:
14.9 days - Average sunshine days in September:
19.1 days - Average sunshine days in October:
21.4 days - Average sunshine days in November:
23 days - Average sunshine days in December:
22 days
The month with the most sunshine days is November (23 days).
The month with the least sunshine days is July (14.3 days).
Average UV index
West McLean, VA
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover
West McLean, VA
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility
West McLean, 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).
