May weather forecast
Frederick, MD

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A stone bridge over the calm Carroll Creek in the Carroll Creek Linear Park in Frederick, Maryland
A stone bridge over the calm Carroll Creek in the Carroll Creek Linear Park in Frederick, Maryland

Weather in May

The month of May sees a full bloom of Spring and a gentle whisper into Summer in Frederick. Having left the cooler temperatures of April behind, the people of Frederick now revel in the luxury of balmy weather patterns. The city witnesses its maximum rainfall, measuring up to an average of 3.54" (90mm). The increased rainfall and longer sunshine herald the onset of a picturesque and vibrant Summer. Complimented by moderately warm temperatures and diminishing wind speeds, the weather in May is a lover's delight.

Temperature

The onset of May in Frederick, Maryland, marks an increase in the average high-temperature, moving from a comfortable 62.6°F (17°C) in April to an agreeable 72.7°F (22.6°C). Throughout the month of May, Frederick sees a steady low-temperature average of 52.7°F (11.5°C).

Humidity

May, October and December, with an average relative humidity of 79%, are the most humid months in Frederick.

Rainfall

The month with the most rainfall is May, when the rain falls for 18.6 days and typically aggregates up to 3.54" (90mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Frederick aggregates 0.16" (4mm) of snow. Throughout the year, in Frederick, there are 19.8 snowfall days, and 11.46" (291mm) of snow is accumulated.

Daylight

In May, the average length of the day is 14h and 22min.
On the first day of the month, sunrise is at 6:09 am and sunset at 8:03 pm. On the last day of May, sunrise is at 5:44 am and sunset at 8:30 pm EDT.

Sunshine

In Frederick, the average sunshine in May is 8.5h.

UV index

The months with the highest UV index in Frederick are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 6 in May interprets into the following recommendations:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
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Frequently asked questions

What are the temperatures in Frederick in May?

The high-temperature, in May, in Frederick, is 72.7°F (22.6°C), while the low-temperature averages to 52.7°F (11.5°C).

What are the most humid months in Frederick?

The months with the highest humidity in Frederick, Maryland, are May, October and December, with an average relative humidity of 79%.

What is the average humidity in May in Frederick?

In May, the average relative humidity in Frederick, Maryland, is 79%.

What is the rainiest month in Frederick?

The month with the most rainfall is May, when the rain falls for 18.6 days and typically aggregates up to 3.54" (90mm) of precipitation.

How many days does it rain in May in Frederick?

In Frederick, in May, it is raining for 18.6 days, with typically 3.54" (90mm) of accumulated precipitation.

What is the last month it snows in Frederick?

May is the last month it regularly snows in Frederick. During 0.1 snowfall days, in May, Frederick aggregates 0.16" (4mm) of snow.

How many hours of daylight does Frederick have in May?

In May, the average day length in Frederick is 14h and 22min.

When is the sunrise / sunset in May in Frederick?

On the first day of May in Frederick, sunrise is at 6:09 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:30 pm EDT.

How long on average sun shines in May in Frederick?

In May, the average sunshine duration is 8.5h.

When is the highest UV index in Frederick?

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

What is the UV index intensity in May in Frederick?

In May, the average daily maximum UV index in Frederick, Maryland, is 6. A UV Index of 6 to 7 symbolizes a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Frederick, MD

Average temperature in May - Frederick, MD
  • Average high temperature in May: 72.7°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.6°F).

  • Average low temperature in May: 52.7°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

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Average pressure in May
Frederick, MD

Average pressure in May - Frederick, MD
  • Average pressure in May: 30.01"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).

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Average wind speed in May
Frederick, MD

Average wind speed in May - Frederick, MD
  • Average wind speed in May: 6.1mph

The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

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Average humidity in May
Frederick, MD

Average humidity in May - Frederick, MD
  • Average humidity in May: 79%

The months with the highest relative humidity are May, October and December (79%).
The month with the lowest relative humidity is July (74%).

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Average rainfall in May
Frederick, MD

Average rainfall in May - Frederick, MD
  • Average rainfall in May: 3.54"

The wettest month (with the highest rainfall) is May (3.54").
The driest month (with the least rainfall) is January (1.85").

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Average rainfall days in May
Frederick, MD

Average rainfall days in May - Frederick, MD
  • Average rainfall days in May: 18.6 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is January (8.7 days).

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Average snowfall in May
Frederick, MD

Average snowfall in May - Frederick, MD
  • Average snowfall in May: 0.16"

The month with the highest snowfall is January (3.66").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in May
Frederick, MD

Average snowfall days in May - Frederick, MD
  • Average snowfall days in May: 0.1 days

The months with the highest number of snowfall days are January and February (6.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in May /
Average sunshine in May
Frederick, MD

Average daylight in May / Average sunshine in May - Frederick, MD
  • Average daylight in May: 14h and 2min

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 24min).

  • Average sunshine in May: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 48min).

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Average sunshine days in May
Frederick, MD

Average sunshine days in May - Frederick, MD
  • Average sunshine days in May: 11.1 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11.1 days).

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Average UV index in May
Frederick, MD

Average UV index in May - Frederick, MD
  • Average UV index in May: 6

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 cloud cover in May
Frederick, MD

Average cloud cover in May - Frederick, MD
  • Average cloud cover in May: 47

The months with the most cloud cover are January, February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

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Average visibility in May
Frederick, MD

Average visibility in May - Frederick, MD
  • Average visibility in May: 5mi

The months with the highest visibility are February, March, April, June, July, August, November and December (6mi).
The months with the lowest visibility are January, May, September and October (5mi).

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Frederick, Maryland, USA

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