2024 Compare Climate & Weather:
Great Falls, VA vs Potomac, MD
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Highlights
On average, there are 201 sunny days per year in Potomac. Great Falls averages 196 sunny days per year. The US average is 205 sunny days.
Potomac, Maryland gets 42 inches of rain, on average, per year. Great Falls, Virginia gets 42.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.
Potomac averages 16.8 inches of snow per year. Great Falls averages 21.5 inches of snow per year. The US average is 27.8 inches of snow per year.
Weather Highlights
Potomac, Maryland
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 25.3
Rain: averages 42 inches of rain a year
Snow: averages 16.8 inches of snow a year
Great Falls, Virginia
Summer High: the July high is around 85.8 degrees
Winter Low: the January low is 23.5
Rain: averages 42.4 inches of rain a year
Snow: averages 21.5 inches of snow a year
BESTPLACES COMFORT INDEX
PotomacThe annual BestPlaces Comfort Index for Potomac is 7.3 (10=best), which means it is more comfortable than most places in Maryland.
7.3 / 10
September, June and May are the most pleasant months in Potomac, while January and February are the least comfortable months.
Great FallsThe annual BestPlaces Comfort Index for Great Falls is 7.3 (10=best), which means it is about average compared to other places in Virginia.
7.3 / 10
September, June and May are the most pleasant months in Great Falls, while January and February are the least comfortable months.
Today's Weather - Great Falls, VA
7 AM PST
Chance Showers And Thunderstorms
69°F
| DAY | DESCRIPTION | HIGH / LOW | WIND |
|---|
| Today | Chance Showers And Thunderstorms | 79° / 64° | E 5 mph |
| Wednesday | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 86° / 63° | SW 5 to 12 mph |
| Thursday | Showers And Thunderstorms | 78° / 60° | S 5 to 15 mph |
| Friday | Chance Showers And Thunderstorms | 70° / 51° | NW 16 mph |
| Saturday | Mostly Sunny then Chance Showers And Thunderstorms | 68° / 51° | W 12 mph |
| Sunday | Chance Rain Showers | 69° / 49° | W 8 to 14 mph |
| Monday | Mostly Sunny then Slight Chance Rain Showers | 72° / 54° | W 7 to 10 mph |
Today's Weather - Potomac, MD
7 AM PST
Chance Showers And Thunderstorms
70°F
| DAY | DESCRIPTION | HIGH / LOW | WIND |
|---|
| Today | Chance Showers And Thunderstorms | 79° / 64° | E 6 mph |
| Wednesday | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 86° / 63° | SW 5 to 13 mph |
| Thursday | Showers And Thunderstorms | 78° / 60° | S 6 to 14 mph |
| Friday | Chance Rain Showers | 70° / 51° | W 16 mph |
| Saturday | Mostly Sunny then Chance Showers And Thunderstorms | 68° / 51° | W 12 mph |
| Sunday | Chance Rain Showers | 68° / 50° | W 9 to 14 mph |
| Monday | Mostly Sunny then Slight Chance Rain Showers | 72° / 54° | W 10 mph |
Average Monthly High / Low (°F)
| Month | Great Falls, VA | Potomac, MD |
|---|
| January | 42° / 24° | 42° / 25° |
| February | 46° / 26° | 46° / 28° |
| March | 54° / 32° | 54° / 35° |
| April | 66° / 42° | 66° / 44° |
| May | 73° / 52° | 74° / 53° |
| June | 82° / 61° | 82° / 63° |
| July | 86° / 66° | 86° / 68° |
| August | 84° / 64° | 84° / 66° |
| September | 78° / 56° | 77° / 59° |
| October | 67° / 44° | 66° / 47° |
| November | 57° / 35° | 56° / 38° |
| December | 45° / 27° | 45° / 29° |
Hot, Freezing, Rainy, Snowy Days: Great Falls / Potomac
| Month | Hot Days | Freezing Days | Rainy Days | Snowy Days |
|---|
| January | 0 / 0 | 25 / 23 | 10 / 10 | 3 / 3 |
| February | 0 / 0 | 22 / 20 | 9 / 8 | 3 / 2 |
| March | 0 / 0 | 16 / 13 | 10 / 10 | 1 / 1 |
| April | 0 / 0 | 4 / 2 | 10 / 10 | 0 / 0 |
| May | 1 / 1 | 0 / 0 | 12 / 12 | 0 / 0 |
| June | 3 / 4 | 0 / 0 | 11 / 10 | 0 / 0 |
| July | 7 / 8 | 0 / 0 | 10 / 10 | 0 / 0 |
| August | 6 / 5 | 0 / 0 | 9 / 8 | 0 / 0 |
| September | 2 / 1 | 0 / 0 | 9 / 9 | 0 / 0 |
| October | 0 / 0 | 3 / 1 | 8 / 8 | 0 / 0 |
| November | 0 / 0 | 12 / 8 | 9 / 9 | 0 / 0 |
| December | 0 / 0 | 23 / 20 | 10 / 9 | 2 / 1 |
July is the hottest month for Great Falls with an average high temperature of 85.8°, which ranks it as cooler than most places in Virginia. In Great Falls, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Great Falls are September, June and May.
July is the hottest month for Potomac with an average high temperature of 85.7°, which ranks it as cooler than most places in Maryland. In Potomac, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Potomac are September, June and May.
January has the coldest nighttime temperatures for Great Falls with an average of 23.5°. This is colder than most places in Virginia.
January has the coldest nighttime temperatures for Potomac with an average of 25.3°. This is about average compared to other places in Maryland.
In Great Falls, there are 18.4 days annually when the high temperature is over 90°, which is cooler than most places in Virginia.
In Potomac, there are 18.6 days annually when the high temperature is over 90°, which is cooler than most places in Maryland.
In Great Falls, there are 103.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Virginia.
In Potomac, there are 87.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Maryland.
In Great Falls, there are 0.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Virginia.
In Potomac, there are 0.2 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Maryland.
May is the wettest month in Great Falls with 4.4 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Summer with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 42.4 inches in Great Falls means that it is drier than most places in Virginia.
May is the wettest month in Potomac with 4.3 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Summer with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 42.0 inches in Potomac means that it is drier than most places in Maryland.
May is the rainiest month in Great Falls with 12.0 days of rain, and October is the driest month with only 8.2 rainy days. There are 116.3 rainy days annually in Great Falls, which is about average compared to other places in Virginia. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.
May is the rainiest month in Potomac with 11.9 days of rain, and February is the driest month with only 8.4 rainy days. There are 114.0 rainy days annually in Potomac, which is about average compared to other places in Maryland. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.
An annual snowfall of 21.5 inches in Great Falls means that it is one of the snowiest places in Virginia.
An annual snowfall of 16.8 inches in Potomac means that it is snowier than most places in Maryland.
February is the snowiest month in Great Falls with 7.8 inches of snow, and 5 months of the year have significant snowfall.
January is the snowiest month in Potomac with 6.4 inches of snow, and 5 months of the year have significant snowfall.
DID YOU KNOW?
Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.
Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.
Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.
Reviews for Great Falls 
2 Reviews
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
Start Your Review of Great Falls
Reviews for Potomac 2 Reviews
Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't More
Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but More
Start Your Review of Potomac
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