May weather forecast
Jefferson, IA

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Weather in May

May, the last month of the spring in Jefferson, is a pleasant month, with an average temperature ranging between min 53.1°F (11.7°C) and max 69.4°F (20.8°C).

Temperature

Jefferson's weather shows a temperature rise with the arrival of May, moving from a mild 58.5°F (14.7°C) in April to an agreeable 69.4°F (20.8°C). In Jefferson, the average nighttime temperature during May is a fresh 53.1°F (11.7°C).

Humidity

The average relative humidity in May in Jefferson, Iowa, is 74%.

Rainfall

The month with the most rainfall in Jefferson is May, when the rain falls for 16.2 days and typically aggregates up to 4.06" (103mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.3 snowfall days, in May, Jefferson aggregates 0.12" (3mm) of snow. Throughout the year, there are 38.1 snowfall days, and 15.31" (389mm) of snow is accumulated.

Daylight

In May, the average length of the day in Jefferson is 14h and 35min.
On the first day of May, sunrise is at 6:12 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:46 pm CDT.

Sunshine

In May, the average sunshine in Jefferson is 8.6h.

UV index

In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: The UV index of 5 during May leads to these advisories:
Exercise prevention - Precautions against solar damage are endorsed. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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Frequently asked questions

What is the temperature in May in Jefferson?

The average high-temperature and low-temperature during May are 69.4°F (20.8°C) and 53.1°F (11.7°C) respectively.

What is the average humidity in May in Jefferson?

In Jefferson, the average relative humidity in May is 74%.

What is the wettest month in Jefferson?

May is the month with the most rainfall in Jefferson. Rain falls for 16.2 days and accumulates 4.06" (103mm) of precipitation.

How many days does it rain in May in Jefferson?

In May, the rain falls for 16.2 days. Throughout May, 4.06" (103mm) of precipitation is accumulated.

What is the last month it snows in Jefferson?

May is the last month it regularly snows in Jefferson, Iowa. During 0.3 snowfall days, in May, Jefferson aggregates 0.12" (3mm) of snow.

How many hours of daylight does Jefferson have in May?

The average day length in May is 14h and 35min.

When is the sunrise / sunset in May in Jefferson?

In May, on the first day of the month, sunrise is at 6:12 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:46 pm CDT.

How long on average sun shines in May in Jefferson?

In May, the average sunshine duration in Jefferson is 8.6h.

How high is the UV index in May in Jefferson?

The average daily maximum UV index in May in Jefferson, Iowa, 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
Jefferson, IA

Average temperature in May - Jefferson, IA
  • Average high temperature in May: 69.4°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (26.8°F).

  • Average low temperature in May: 53.1°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

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Average pressure in May
Jefferson, IA

Average pressure in May - Jefferson, IA
  • Average pressure in May: 29.93"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in May
Jefferson, IA

Average wind speed in May - Jefferson, IA
  • Average wind speed in May: 9.1mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

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Average humidity in May
Jefferson, IA

Average humidity in May - Jefferson, IA
  • Average humidity in May: 74%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).

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Average rainfall in May
Jefferson, IA

Average rainfall in May - Jefferson, IA
  • Average rainfall in May: 4.06"

The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is January (0.87").

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Average rainfall days in May
Jefferson, IA

Average rainfall days in May - Jefferson, IA
  • Average rainfall days in May: 16.2 days

The month with the highest number of rainy days is June (17.3 days).
The month with the least rainy days is February (3.4 days).

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Average snowfall in May
Jefferson, IA

Average snowfall in May - Jefferson, IA
  • Average snowfall in May: 0.12"

The month with the highest snowfall is January (4.29").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Jefferson, IA

Average snowfall days in May - Jefferson, IA
  • Average snowfall days in May: 0.3 days

The month with the highest number of snowfall days is January (9.8 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
Jefferson, IA

Average daylight in May / Average sunshine in May - Jefferson, IA
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days in May
Jefferson, IA

Average sunshine days in May - Jefferson, IA
  • Average sunshine days in May: 13.3 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in May
Jefferson, IA

Average UV index in May - Jefferson, IA
  • 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, October, November and December (UV index 2).

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Average cloud cover in May
Jefferson, IA

Average cloud cover in May - Jefferson, IA
  • Average cloud cover in May: 42

The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).

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Average visibility in May
Jefferson, IA

Average visibility in May - Jefferson, IA
  • Average visibility in May: 6mi

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

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Jefferson, Iowa, USA

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