May weather forecast
Mendham, NJ

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Weather in May

The last month of the spring, May, is an agreeable month in Mendham, New Jersey, with an average temperature fluctuating between 69.6°F (20.9°C) and 50.9°F (10.5°C).

Temperature

May sees a rise in the average high-temperature, climbing from a mild 58.6°F (14.8°C) in April to a pleasant 69.6°F (20.9°C). The average nighttime temperature lowers to a fresh 50.9°F (10.5°C) throughout May.

Humidity

The average relative humidity in May is 78%.

Rainfall

In Mendham, during May, the rain falls for 17.3 days and regularly aggregates up to 3.11" (79mm) of precipitation. In Mendham, during the entire year, the rain falls for 162.6 days and collects up to 33.11" (841mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.2 snowfall days, in May, Mendham aggregates 0.55" (14mm) of snow. Throughout the year, there are 28.5 snowfall days, and 14.49" (368mm) of snow is accumulated.

Daylight

In May, the average length of the day is 14h and 28min.
On the first day of May in Mendham, sunrise is at 5:55 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 5:29 am and sunset at 8:23 pm EDT.

Sunshine

In Mendham, New Jersey, the average sunshine in May is 8.5h.

UV index

In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In May, a daily UV index of 5 turns into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. The solar radiation around mid-day is intense; avoid the Sun and stay safe. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

What is the usual temperature for Mendham in May?

The average high-temperature and low-temperature during May are 69.6°F (20.9°C) and 50.9°F (10.5°C) respectively.

What is the average humidity in May in Mendham?

In Mendham, New Jersey, the average relative humidity in May is 78%.

How many days does it rain in May in Mendham?

In Mendham, during May, the rain falls for 17.3 days and regularly aggregates up to 3.11" (79mm) of precipitation.

What is the last month it snows in Mendham?

May is the last month it regularly snows. During 0.2 snowfall days, in May, Mendham aggregates 0.55" (14mm) of snow.

How many hours of daylight does Mendham have in May?

In Mendham, the average day length in May is 14h and 28min.

When are sunrise and sunset in May in Mendham?

On the first day of May in Mendham, sunrise is at 5:55 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 5:29 am and sunset at 8:23 pm EDT.

How many hours of sunshine does Mendham have in May?

In May, the average sunshine duration in Mendham is 8.5h.

What is the UV index reading in May in Mendham?

The average daily maximum UV index in May in Mendham is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Mendham, NJ

Average temperature in May - Mendham, NJ
  • Average high temperature in May: 69.6°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in May: 50.9°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

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Average pressure in May
Mendham, NJ

Average pressure in May - Mendham, NJ
  • Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in May
Mendham, NJ

Average wind speed in May - Mendham, NJ
  • Average wind speed in May: 6.4mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in May
Mendham, NJ

Average humidity in May - Mendham, NJ
  • Average humidity in May: 78%

The months with the highest relative humidity are February and October (80%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in May
Mendham, NJ

Average rainfall in May - Mendham, NJ
  • Average rainfall in May: 3.11"

The wettest month (with the highest rainfall) is December (3.39").
The driest month (with the least rainfall) is September (1.85").

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Average rainfall days in May
Mendham, NJ

Average rainfall days in May - Mendham, NJ
  • Average rainfall days in May: 17.3 days

The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is January (8.9 days).

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Average snowfall in May
Mendham, NJ

Average snowfall in May - Mendham, NJ
  • Average snowfall in May: 0.55"

The month with the highest snowfall is March (4.49").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Mendham, NJ

Average snowfall days in May - Mendham, NJ
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in May /
Average sunshine in May
Mendham, NJ

Average daylight in May / Average sunshine in May - Mendham, NJ
  • Average daylight in May: 14h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in May: 8h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in May
Mendham, NJ

Average sunshine days in May - Mendham, NJ
  • Average sunshine days in May: 11.4 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (11.4 days).

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Average UV index in May
Mendham, NJ

Average UV index in May - Mendham, NJ
  • Average UV index in May: 5

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in May
Mendham, NJ

Average cloud cover in May - Mendham, NJ
  • Average cloud cover in May: 47

The months with the most cloud cover are February and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 33).

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Average visibility in May
Mendham, NJ

Average visibility in May - Mendham, NJ
  • Average visibility in May: 5mi

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

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Mendham, New Jersey, USA

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