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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Great Falls, Virginia, is an icy winter month, with an average temperature ranging between min 26.4°F (-3.1°C) and max 39.7°F (4.3°C). January, characterized by an average high temperature of 39.7°F (4.3°C) and a low temperature of 26.4°F (-3.1°C), is generally the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is a frosty month in Great Falls, Virginia, with an average temperature ranging between max 43.9°F (6.6°C) and min 28.8°F (-1.8°C). The transition into February marks the average high-temperature at a chilly 43.9°F (6.6°C), differing minimally from January's 39.7°F (4.3°C). Weather in February »
Weather in March
March, the first month of the spring in Great Falls, is a fresh month, with an average temperature varying between 36.1°F (2.3°C) and 52.5°F (11.4°C). The coming of March brings a minor shift in Great Falls's weather, with average high-temperatures adjusting from February's chilly 43.9°F (6.6°C) to a cool 52.5°F (11.4°C). Weather in March »
Weather in April
April is an enjoyable spring month in Great Falls, Virginia, with an average temperature varying between 45.9°F (7.7°C) and 64.9°F (18.3°C). The start of April brings a shift in the average high-temperature, increasing from March's fresh 52.5°F (11.4°C) to a comfortable 64.9°F (18.3°C). Weather in April »
Weather in May
May, the last month of the spring in Great Falls, is a moderately hot month, with an average temperature varying between 55.6°F (13.1°C) and 74.8°F (23.8°C). With the onset of May, Great Falls experiences a temperature shift, with the average high-temperature moving from a comfortable 64.9°F (18.3°C) in April to a moderately hot 74.8°F (23.8°C). Weather in May »
Weather in June
June, the first month of the summer in Great Falls, is still a warm month, with temperature in the range of an average low of 63.3°F (17.4°C) and an average high of 82.9°F (28.3°C). The shift into June is characterized by a subtle rise in the average high-temperature, transitioning from May's moderately hot 74.8°F (23.8°C) to a still warm 82.9°F (28.3°C). Weather in June »
Weather in July
July in Great Falls, Virginia, is a tropical summer month, with an average temperature varying between 68.5°F (20.3°C) and 87.6°F (30.9°C). July is the warmest month, with an average high-temperature of 87.6°F (30.9°C) and an average low-temperature of 68.5°F (20.3°C). The heat index for July is calculated to be a torrid 98.6°F (37°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Great Falls, Virginia, with an average temperature varying between 85.6°F (29.8°C) and 67.3°F (19.6°C). The initiation of August records an average high-temperature of a warm 85.6°F (29.8°C), displaying a near consistency with the previous month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Great Falls, Virginia, with an average temperature fluctuating between 78.4°F (25.8°C) and 60.8°F (16°C). Great Falls's progression into September involves a minor drop in the average high-temperature, slightly receding from 85.6°F (29.8°C) in August to a still moderately hot 78.4°F (25.8°C). Weather in September »
Weather in October
October, like September, in Great Falls, Virginia, is another enjoyable autumn month, with an average temperature varying between 49.6°F (9.8°C) and 66.2°F (19°C). With October's arrival, Great Falls sees a decrease in average high-temperatures, moving from a moderately hot 78.4°F (25.8°C) in September to a comfortable 66.2°F (19°C). Weather in October »
Weather in November
November, the last month of the autumn in Great Falls, is also a fresh month, with an average temperature varying between 53.4°F (11.9°C) and 38.7°F (3.7°C). The move into November indicates a reduction in the average high-temperature, down from October's enjoyable 66.2°F (19°C) to a cool 53.4°F (11.9°C). Weather in November »
Weather in December
The first month of the winter, December, is still a chilly month in Great Falls, Virginia, with temperature in the range of an average low of 32.7°F (0.4°C) and an average high of 45.3°F (7.4°C). Great Falls's weather subtly changes with the onset of December, barely falling from a fresh 53.4°F (11.9°C) in November to a frosty 45.3°F (7.4°C). Weather in December »
Updated: Aug 1, 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
What time of the year is the coldest in Great Falls?
Great Falls's coldest month, January, generally records average temperatures ranging from a high of 39.7°F (4.3°C) to a low of 26.4°F (-3.1°C).
What is the driest month in Great Falls?
The month with the least rainfall is January, when the rain falls for 9.4 days and typically collects 1.77" (45mm) of precipitation.
How much does it rain?
In Great Falls, during the entire year, the rain falls for 152.8 days and collects up to 27.64" (702mm) of precipitation.
When does it snow?
January through April, November and December are months with snowfall.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 4.6 days and accumulates 2.28" (58mm) of snow.
How many days does it snow in Great Falls?
In Great Falls, during the entire year, snow falls for 13.9 days and aggregates up to 7.2" (183mm) of snow.
What are the months with the least sunshine?
The months with the least sunshine are January, February and December, with an average of 5h of sunshine.
What are the months with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Great Falls, 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.
When it does not snow?
In Great Falls, snow does not fall in May through October.
What is the month with the highest UV index?
May through August, with an average maximum UV index of 6, are months with the highest UV index.
When are the longest days?
With an average of 14h and 54min of daylight, June has the longest days of the year.
What part of the year is the hottest?
July brings the highest temperatures, with an average high of 87.6°F (30.9°C) and an average low of 68.5°F (20.3°C).
What is the least humid month?
The least humid month is July, with an average relative humidity of 69%.
What month has the most sunshine?
With an average of 10.7h of sunshine, July has the most sunshine of the year.
What is the rainiest month?
August is the month with the most rainfall. Rain falls for 15.6 days and accumulates 3.39" (86mm) of precipitation.
What are the most humid months?
The months with the highest humidity are October and December, with an average relative humidity of 76%.
What is the month with the shortest days in Great Falls?
December has the shortest days of the year, with an average of 9h and 30min of daylight.
Average temperature
Great Falls, VA
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (39.7°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure
Great Falls, VA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.08"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
Great Falls, 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:
6.7mph - 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
Great Falls, VA
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall
Great Falls, VA
- Average rainfall in January:
1.77" - Average rainfall in February:
1.89" - Average rainfall in March:
2.13" - Average rainfall in April:
2.24" - Average rainfall in May:
2.76" - Average rainfall in June:
2.36"
- Average rainfall in July:
2.68" - Average rainfall in August:
3.39" - Average rainfall in September:
1.93" - Average rainfall in October:
2.28" - Average rainfall in November:
2.05" - Average rainfall in December:
2.17"
The wettest month (with the highest rainfall) is August (3.39").
The driest month (with the least rainfall) is January (1.77").
Average rainfall days
Great Falls, VA
- Average rainfall days in January:
9.4 days - Average rainfall days in February:
9.8 days - Average rainfall days in March:
13.4 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
16.3 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
15.1 days - Average rainfall days in August:
15.6 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
12 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
9.8 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is November (9.3 days).
Average snowfall
Great Falls, VA
The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Great Falls, VA
- Average snowfall days in January:
4.6 days - Average snowfall days in February:
4.4 days - Average snowfall days in March:
2.3 days - Average snowfall days in April:
0.1 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:
2.2 days
The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Great Falls, VA
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 3min
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 0min - Average sunshine in February:
5h and 0min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 5min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 0min).
Average sunshine days
Great Falls, VA
- Average sunshine days in January:
17.8 days - Average sunshine days in February:
15.1 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
13.3 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
13.4 days
- Average sunshine days in July:
13.9 days - Average sunshine days in August:
14.2 days - Average sunshine days in September:
16.3 days - Average sunshine days in October:
17.1 days - Average sunshine days in November:
19.3 days - Average sunshine days in December:
17.9 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index
Great Falls, 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, February, November and December (UV index 2).
Average cloud cover
Great Falls, 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
Great Falls, 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).
Great Falls, Virginia, USA
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