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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 Adelphi, Maryland, is another cold winter month, with an average temperature ranging between min 27.1°F (-2.7°C) and max 39.7°F (4.3°C). January is the coldest month, with the temperature often reaching an average high of 39.7°F (4.3°C) and an average low of 27.1°F (-2.7°C). Weather in January »
Weather in February
February, the last month of the winter in Adelphi, is a frosty month, with an average temperature fluctuating between 43.9°F (6.6°C) and 29.8°F (-1.2°C). February's average high-temperature stands at a chilly 43.9°F (6.6°C), showing little deviation from January's 39.7°F (4.3°C). Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Adelphi, Maryland, with an average temperature varying between 52.3°F (11.3°C) and 37°F (2.8°C). In March, the meteorological conditions subtly change with the average high-temperature edging from a frosty 43.9°F (6.6°C) in February to a cool 52.3°F (11.3°C). Weather in March »
Weather in April
April in Adelphi, Maryland, is a comfortable spring month, with temperature in the range of an average low of 46.8°F (8.2°C) and an average high of 64.9°F (18.3°C). April indicates a change in the average high-temperature, moving up 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
The last month of the spring, May, is a moderately hot month in Adelphi, Maryland, with an average temperature varying between 74.3°F (23.5°C) and 56.5°F (13.6°C). May's arrival coincides with a temperature rise, moving from April's enjoyable 64.9°F (18.3°C) to a moderately hot 74.3°F (23.5°C). Weather in May »
Weather in June
June, the first month of the summer in Adelphi, is still a warm month, with an average temperature fluctuating between 64.4°F (18°C) and 82.2°F (27.9°C). The shift into June is characterized by a subtle rise in the average high-temperature, transitioning from May's 74.3°F (23.5°C) to a still moderately hot 82.2°F (27.9°C). Weather in June »
Weather in July
July in Adelphi, Maryland, is a tropical summer month, with an average temperature fluctuating between 87.4°F (30.8°C) and 69.6°F (20.9°C). The warmest time of the year is July, with temperatures averaging a high of 87.4°F (30.8°C) and a low of 69.6°F (20.9°C). Throughout July, the heat index is computed to be a torrid 98.6°F (37°C). Weather in July »
Weather in August
August, the last month of the summer in Adelphi, is another warm month, with an average temperature ranging between max 85.6°F (29.8°C) and min 68.2°F (20.1°C). August's weather records an average high-temperature of a warm 85.6°F (29.8°C), showing little deviation from July. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Adelphi, Maryland, with an average temperature fluctuating between 78.4°F (25.8°C) and 61.7°F (16.5°C). A subtle change in temperatures is noted as August gives way to September, with average highs reducing from a moderately hot 85.6°F (29.8°C) to a still warm 78.4°F (25.8°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Adelphi, Maryland, with an average temperature fluctuating between 50.9°F (10.5°C) and 66.4°F (19.1°C). In October, the average high-temperature goes from a moderately hot 78.4°F (25.8°C) in September to a comfortable 66.4°F (19.1°C). Weather in October »
Weather in November
November, the last month of the autumn in Adelphi, is another cool month, with an average temperature ranging between min 39.4°F (4.1°C) and max 53.6°F (12°C). The arrival of November corresponds with a temperature reduction, down from October's comfortable 66.4°F (19.1°C) to a fresh 53.6°F (12°C). Weather in November »
Weather in December
December, the first month of the winter in Adelphi, is also a frosty month, with temperature in the range of an average high of 45.3°F (7.4°C) and an average low of 33.3°F (0.7°C). December is marked by a subtle drop in average high-temperatures, transitioning from a cool 53.6°F (12°C) in November to a frosty 45.3°F (7.4°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
What time of the year is the coldest?
The coldest period is January, when temperatures fluctuate between an average high of 39.7°F (4.3°C) and a low of 27.1°F (-2.7°C).
What is the driest month?
January is the month with the least rainfall in Adelphi. Rain falls for 8.8 days and accumulates 1.89" (48mm) of precipitation.
How many days does it rain?
In Adelphi, during the entire year, the rain falls for 154.8 days and collects up to 30.28" (769mm) 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 2.87" (73mm) of snow.
How many days does it snow?
In Adelphi, during the entire year, snow falls for 15 days and aggregates up to 9.17" (233mm) of snow.
When is the lowest UV index?
January, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the month with the least sunshine?
With an average of 4.9h of sunshine, February has the least sunshine of the year.
When is Daylight Saving Time (DST)?
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.
What are the most humid months?
May, October and December, with an average relative humidity of 75%, are most humid months.
When it does not snow?
In Adelphi, Maryland, snow does not fall in May through October.
When is the highest UV index?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days?
June has the longest days of the year, with an average of 14h and 54min of daylight.
What is the warmest month?
In Adelphi, the peak temperatures are generally noted in July, averaging a high of 87.4°F (30.8°C) and a low of 69.6°F (20.9°C).
What is the least humid month?
With an average relative humidity of 69%, July is the least humid month.
What month has the most sunshine?
The month with the most sunshine in Adelphi, Maryland, is July, with an average of 10.6h of sunshine.
What is the wettest month?
The month with the most rainfall is August, when the rain falls for 16.3 days and typically aggregates up to 3.86" (98mm) of precipitation.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 30min of daylight.
Average temperature
Adelphi, 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 (39.7°F).
The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (27.1°F).
Average pressure
Adelphi, 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
Adelphi, MD
- Average wind speed in January:
7.8mph - Average wind speed in February:
7.8mph - Average wind speed in March:
8.1mph - Average wind speed in April:
8mph - Average wind speed in May:
6.6mph - Average wind speed in June:
6mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5.2mph - Average wind speed in September:
5.8mph - Average wind speed in October:
6.7mph - Average wind speed in November:
7mph - Average wind speed in December:
7.1mph
The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity
Adelphi, MD
The months with the highest relative humidity are May, October and December (75%).
The month with the lowest relative humidity is July (69%).
Average rainfall
Adelphi, MD
- Average rainfall in January:
1.89" - Average rainfall in February:
2.01" - Average rainfall in March:
2.28" - Average rainfall in April:
2.52" - Average rainfall in May:
2.87" - Average rainfall in June:
2.48"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days
Adelphi, MD
- Average rainfall days in January:
8.8 days - Average rainfall days in February:
9.3 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
17.7 days - Average rainfall days in June:
15.2 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
16.3 days - Average rainfall days in September:
12.4 days - Average rainfall days in October:
11.8 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).
Average snowfall
Adelphi, MD
The month with the highest snowfall is January (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Adelphi, MD
- Average snowfall days in January:
4.6 days - Average snowfall days in February:
4.3 days - Average snowfall days in March:
3.1 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:
0.4 days - Average snowfall days in December:
2.5 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
Adelphi, MD
- 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:
4h and 5min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 0min
- 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 3min - 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 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days
Adelphi, MD
- Average sunshine days in January:
18.1 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
15 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
12 days - Average sunshine days in June:
13.3 days
- Average sunshine days in July:
13.5 days - Average sunshine days in August:
13.8 days - Average sunshine days in September:
16.1 days - Average sunshine days in October:
17.1 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (12 days).
Average UV index
Adelphi, 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, November and December (UV index 2).
Average cloud cover
Adelphi, MD
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility
Adelphi, 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).
Adelphi, Maryland, USA
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