Climate and monthly weather forecastPotomac, MD
Climate and monthly weather forecast
Weather in January
January, like December, in Potomac, Maryland, is a wintry winter month, with an average temperature ranging between min 26.4°F (-3.1°C) and max 39.4°F (4.1°C). Temperature readings reach their annual highs in January, averaging 39.4°F (4.1°C) and a minimum average of 26.4°F (-3.1°C). Weather in January »Weather in February
February, the last month of the winter in Potomac, is a frosty month, with temperature in the range of an average high of 43.9°F (6.6°C) and an average low of 28.8°F (-1.8°C). As Potomac welcomes February, the average high-temperature stabilizes at a chilly 43.9°F (6.6°C), showing little deviation from January's 39.4°F (4.1°C). Weather in February »Weather in March
The first month of the spring, March, is a cool month in Potomac, Maryland, with an average temperature ranging between max 52.3°F (11.3°C) and min 36.1°F (2.3°C). March brings a slight elevation in the average high-temperature, transitioning from February's frosty 43.9°F (6.6°C) to a fresh 52.3°F (11.3°C). Weather in March »Weather in April
April is a comfortable spring month in Potomac, Maryland, with temperature in the range of an average low of 46°F (7.8°C) and an average high of 64.9°F (18.3°C). The onset of April brings a rise in the average high-temperature, elevating from a cool 52.3°F (11.3°C) in March to a comfortable 64.9°F (18.3°C). Weather in April »Weather in May
May, the last month of the spring in Potomac, is a moderately hot month, with an average temperature ranging between min 55.6°F (13.1°C) and max 74.3°F (23.5°C). As May begins, there is an increase in the average high-temperature, moving from an enjoyable 64.9°F (18.3°C) in April to a warm 74.3°F (23.5°C). Weather in May »Weather in June
The first month of the summer, June, is still a warm month in Potomac, Maryland, with temperature in the range of an average high of 82.2°F (27.9°C) and an average low of 63.5°F (17.5°C). The arrival of June witnesses a small shift in the average high-temperature, moving from 74.3°F (23.5°C) in May to a still moderately hot 82.2°F (27.9°C). Weather in June »Weather in July
July is a tropical summer month in Potomac, Maryland, with an average temperature varying between 68.5°F (20.3°C) and 87.4°F (30.8°C). Potomac experiences its highest temperatures in July, with an average peak of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C). July's average heat index is computed to be a fiery hot 98.6°F (37°C). Weather in July »Weather in August
August, the last month of the summer in Potomac, is another warm month, with temperature in the range of an average low of 67.3°F (19.6°C) and an average high of 85.5°F (29.7°C). The average high-temperature for August is a moderately hot 85.5°F (29.7°C), closely aligning with the temperature of the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Potomac, is still a warm month, with temperature in the range of an average low of 60.8°F (16°C) and an average high of 78.3°F (25.7°C). September signifies a minor drop in average high-temperature, transitioning from a moderately hot 85.5°F (29.7°C) in August to a still warm 78.3°F (25.7°C). Weather in September »Weather in October
October, like September, in Potomac, Maryland, is another comfortable autumn month, with an average temperature fluctuating between 49.8°F (9.9°C) and 65.8°F (18.8°C). The transition into October is accompanied by a temperature decrease, with the average high-temperature shifting from a warm 78.3°F (25.7°C) in September to a refreshing 65.8°F (18.8°C). Weather in October »Weather in November
November, the last month of the autumn in Potomac, is also a fresh month, 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). The arrival of November signals a shift in temperature, down from a comfortable 65.8°F (18.8°C) in October to a cool 53.4°F (11.9°C). Weather in November »Weather in December
The first month of the winter, December, is also a frosty month in Potomac, Maryland, with an average temperature ranging between min 32.9°F (0.5°C) and max 45.5°F (7.5°C). With the beginning of December, the average high-temperature shows a small decrease, transitioning from a fresh 53.4°F (11.9°C) in November to a chilly 45.5°F (7.5°C). Weather in December »Updated: Jun 4, 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
January, noted for its average high-temperature of 39.4°F (4.1°C) and an average low-temperature of 26.4°F (-3.1°C), is considered the coldest month.
Throughout the year, in Potomac, Maryland, there are 156.5 rainfall days, and 30.71" (780mm) of precipitation is accumulated.
January through April, November and December are months with snowfall.
In Potomac, during the entire year, snow falls for 15.5 days and aggregates up to 10.24" (260mm) of snow.
The months with the lowest UV index in Potomac are January, February, November and December, with an average maximum UV index of 2.
The month with the least rainfall is February, when the rain falls for 9.3 days and typically collects 1.93" (49mm) of precipitation.
With an average of 5h of sunshine, February has the least sunshine of the year.
The month with the most snowfall is March, when snow falls for 3.5 days and typically aggregates up to 3.03" (77mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Potomac, 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.
May through August, with an average maximum UV index of 6, are months with the highest UV index.
With an average of 14h and 54min of daylight, June has the longest days of the year.
Potomac's temperature records reveal July as the warmest month, marked by average highs of 87.4°F (30.8°C) and lows of 68.5°F (20.3°C).
The least humid month is July, with an average relative humidity of 69%.
The month with the most sunshine is July, with an average of 10.8h of sunshine.
August is the month with the most rainfall. Rain falls for 17.3 days and accumulates 3.86" (98mm) 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
Potomac, MD
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.4°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
Potomac, MD
- 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
Potomac, MD
- Average wind speed in January:
7.5mph - Average wind speed in February:
7.6mph - Average wind speed in March:
7.8mph - Average wind speed in April:
7.7mph - Average wind speed in May:
6.3mph - Average wind speed in June:
5.8mph
- 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:
6.9mph
The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity
Potomac, MD
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall
Potomac, MD
- Average rainfall in January:
1.97" - Average rainfall in February:
1.93" - Average rainfall in March:
2.28" - Average rainfall in April:
2.56" - Average rainfall in May:
3.19" - Average rainfall in June:
2.6"
- Average rainfall in July:
3.15" - Average rainfall in August:
3.86" - Average rainfall in September:
2.13" - Average rainfall in October:
2.4" - Average rainfall in November:
2.28" - Average rainfall in December:
2.36"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is February (1.93").
Average rainfall days
Potomac, MD
- Average rainfall days in January:
8.1 days - Average rainfall days in February:
9.3 days - Average rainfall days in March:
13.5 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
15.7 days
- Average rainfall days in July:
16.1 days - Average rainfall days in August:
17.3 days - Average rainfall days in September:
14.1 days - Average rainfall days in October:
12.1 days - Average rainfall days in November:
8.6 days - Average rainfall days in December:
9.8 days
The month with the highest number of rainy days is August (17.3 days).
The month with the least rainy days is January (8.1 days).
Average snowfall
Potomac, MD
The month with the highest snowfall is March (3.03").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Potomac, MD
- Average snowfall days in January:
4.2 days - Average snowfall days in February:
4.8 days - Average snowfall days in March:
3.5 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:
2.5 days
The month with the highest number of snowfall days is February (4.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Potomac, MD
- 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 18min - 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 6min - Average sunshine in February:
5h and 0min - Average sunshine in March:
6h and 48min - Average sunshine in April:
8h and 54min - Average sunshine in May:
8h and 48min - Average sunshine in June:
10h and 12min
- Average sunshine in July:
10h and 48min - Average sunshine in August:
10h and 12min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 42min - Average sunshine in December:
5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days
Potomac, MD
- Average sunshine days in January:
19.2 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
14.7 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
11.7 days - Average sunshine days in June:
12 days
- Average sunshine days in July:
12.6 days - Average sunshine days in August:
12.4 days - Average sunshine days in September:
14.5 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
19.9 days - Average sunshine days in December:
18.4 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (11.7 days).
Average UV index
Potomac, MD
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
Potomac, MD
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
Potomac, MD
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).
