Climate and monthly weather forecast
Great Falls, VA

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Weather in January

January, like December, in Great Falls, Virginia, is a wintry winter month, with an average temperature ranging between min 26.4°F (-3.1°C) and max 39.7°F (4.3°C). The coldest time of the year is January, with temperatures averaging a high of 39.7°F (4.3°C) and a low of 26.4°F (-3.1°C). Weather in January »

Weather in February

The last month of the winter, February, is a chilly month in Great Falls, Virginia, with an average temperature varying between 28.8°F (-1.8°C) and 43.9°F (6.6°C). February denotes a minimal variation in the average high-temperature to a frosty 43.9°F (6.6°C) 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 cool month, with an average temperature fluctuating between 36.1°F (2.3°C) and 52.5°F (11.4°C). Great Falls, Virginia, in March observes a minor temperature shift, with average high-temperatures adjusting from a frosty 43.9°F (6.6°C) in February to a fresh 52.5°F (11.4°C). Weather in March »

Weather in April

April is a refreshing spring month in Great Falls, Virginia, with an average temperature ranging between min 45.9°F (7.7°C) and max 64.9°F (18.3°C). As April arrives, Great Falls's weather shows an increase in high-temperatures, moving from March's cool 52.5°F (11.4°C) to a refreshing 64.9°F (18.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a moderately hot month in Great Falls, Virginia, with an average temperature fluctuating between 55.6°F (13.1°C) and 74.8°F (23.8°C). The arrival of May brings an increase in high-temperatures, moving from a refreshing 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 also a moderately hot 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 marked by a modest rise in the average high-temperature, moving from May's 74.8°F (23.8°C) to a still moderately hot 82.9°F (28.3°C). Weather in June »

Weather in July

July is a hot summer month in Great Falls, Virginia, with an average temperature varying between 68.5°F (20.3°C) and 87.6°F (30.9°C). July, with average temperatures reaching a high of 87.6°F (30.9°C) and a low of 68.5°F (20.3°C), is the warmest month. July's heat index is computed to be a fiery hot 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 67.3°F (19.6°C) and 85.6°F (29.8°C). August denotes a minimal variation in the average high-temperature to a warm 85.6°F (29.8°C) from July's 87.6°F (30.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Great Falls, Virginia, with an average temperature fluctuating between 60.8°F (16°C) and 78.4°F (25.8°C). With the arrival of September, Great Falls notices a mild change in the average high-temperature, sliding from August's 85.6°F (29.8°C) to a still warm 78.4°F (25.8°C). Weather in September »

Weather in October

October, like September, in Great Falls, Virginia, is another comfortable autumn month, with an average temperature ranging between max 66.2°F (19°C) and min 49.6°F (9.8°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

The last month of the autumn, November, is also a fresh month in Great Falls, Virginia, with temperature in the range of an average low of 38.7°F (3.7°C) and an average high of 53.4°F (11.9°C). As November commences, the average high-temperature shows a reduction, transitioning from a comfortable 66.2°F (19°C) in October to a fresh 53.4°F (11.9°C). Weather in November »

Weather in December

December, the first month of the winter in Great Falls, is still a chilly month, 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). December indicates a minor shift in the average high-temperature, from November's cool 53.4°F (11.9°C) to a chilly 45.3°F (7.4°C). Weather in December »
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Frequently asked questions

What month is the coldest in Great Falls?

January is the coldest month in Great Falls, Virginia, with the temperature often reaching an average high of 39.7°F (4.3°C) and an average low of 26.4°F (-3.1°C).

What is the driest month in Great Falls?

The month with the least rainfall in Great Falls 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?

Throughout the year, there are 152.8 rainfall days, and 27.64" (702mm) of precipitation is accumulated.

When does it snow in Great Falls?

Months with snowfall in Great Falls are January through April, November and December.

What is the snowiest month in Great Falls?

January is the month with the most snowfall in Great Falls. 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, Virginia, 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 in Great Falls?

The months with the least sunshine are January, February and December, with an average of 5h of sunshine.

What is the month with the lowest UV index in Great Falls?

The months with the lowest UV index in Great Falls, Virginia, are January, February, November and December, with an average maximum UV index of 2.

When is Daylight Saving Time (DST) in Great Falls?

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.

When it does not snow in Great Falls?

In Great Falls, snow does not fall in May through October.

What is the month with the highest UV index in Great Falls?

The months with the highest UV index in Great Falls are May through August, with an average maximum UV index of 6.

When are the longest days in Great Falls?

June has the longest days of the year in Great Falls, Virginia, with an average of 14h and 54min of daylight.

What is the hottest time of year in Great Falls?

The temperatures in Great Falls, Virginia, reach their highest averages in July, with highs of 87.6°F (30.9°C) and lows of 68.5°F (20.3°C).

What is the least humid month in Great Falls?

With an average relative humidity of 69%, July is the least humid month in Great Falls.

What month has the most sunshine in Great Falls?

July has the most sunshine of the year in Great Falls, Virginia, with an average of 10.7h of sunshine.

What is the wettest month in Great Falls?

The month with the most rainfall is August, when the rain falls for 15.6 days and typically aggregates up to 3.39" (86mm) of precipitation.

What is the most humid month in Great Falls?

The months with the highest humidity in Great Falls, Virginia, are October and December, with an average relative humidity of 76%.

What is the month with the shortest days in Great Falls?

With an average of 9h and 30min of daylight, December has the shortest days of the year.

Average temperature
Great Falls, VA

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).

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Average pressure
Great Falls, VA

Average pressure - Great Falls, VA

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed
Great Falls, VA

Average wind speed - Great Falls, VA

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).

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Average humidity
Great Falls, VA

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%).

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Average rainfall
Great Falls, VA

Average rainfall - Great Falls, VA

The wettest month (with the highest rainfall) is August (3.39").
The driest month (with the least rainfall) is January (1.77").

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Average rainfall days
Great Falls, VA

Average rainfall days - Great Falls, VA

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).

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Average snowfall
Great Falls, VA

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").

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Average snowfall days
Great Falls, VA

Average snowfall days - Great Falls, VA

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).

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Average daylight / Average sunshine
Great Falls, VA

Average daylight / Average sunshine - Great Falls, VA

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).

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).

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Average sunshine days
Great Falls, VA

Average sunshine days - Great Falls, VA

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (12.8 days).

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Average UV index
Great Falls, VA

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).

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Average visibility
Great Falls, VA

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).

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Great Falls, Virginia, USA

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