May weather forecast
Harlan, IA

Weather in May

The last month of the spring, May, is a pleasant month in Harlan, Iowa, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 52.9°F (11.6°C).

Temperature

In May, the average high-temperature rises from a mild 58.8°F (14.9°C) in April to an agreeable 69.4°F (20.8°C). In May, in Harlan, the average low-temperature is 52.9°F (11.6°C).

Humidity

In May, the average relative humidity in Harlan is 73%.

Rainfall

In Harlan, Iowa, during 15.7 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. Throughout the year, there are 113.5 rainfall days, and 15.71" (399mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.3 snowfall days, Harlan aggregates 0.16" (4mm) of snow. Throughout the year, in Harlan, there are 31.5 snowfall days, and 7.13" (181mm) of snow is accumulated.

Daylight

The average length of the day in May in Harlan is 14h and 33min.
On the first day of the month, sunrise is at 6:17 am and sunset at 8:19 pm. On the last day of May, sunrise is at 5:49 am and sunset at 8:48 pm CDT.

Sunshine

The average sunshine in May in Harlan, Iowa, is 8.8h.

UV index

The average daily maximum UV index in May in Harlan is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in May in Harlan?

In Harlan, Iowa, the average relative humidity in May is 73%.

How many days does it rain in May in Harlan?

In Harlan, Iowa, during May, the rain falls for 15.7 days and regularly aggregates up to 2.6" (66mm) of precipitation.

What is the last month it snows in Harlan?

May is the last month it regularly snows in Harlan. During 0.3 snowfall days, in May, Harlan aggregates 0.16" (4mm) of snow.

What is the average length of the day in May in Harlan?

In Harlan, the average day length in May is 14h and 33min.

When are sunrise and sunset in May in Harlan?

In May, on the first day of the month, sunrise is at 6:17 am and sunset at 8:19 pm. On the last day of the month, in Harlan, Iowa, sunrise is at 5:49 am and sunset at 8:48 pm CDT.

How many hours of sunshine does Harlan have in May?

In Harlan, the average sunshine duration in May is 8.8h.

What is the UV index reading in May in Harlan?

The average daily maximum UV index in May in Harlan is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.

Average temperature in May
Harlan, IA

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

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in May: 52.9°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 (14.5°F).

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Average pressure in May
Harlan, IA

Average pressure in May - Harlan, IA
  • Average pressure in May: 29.92"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in May
Harlan, IA

Average wind speed in May - Harlan, IA
  • Average wind speed in May: 9.3mph

The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).

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Average humidity in May
Harlan, IA

Average humidity in May - Harlan, IA
  • Average humidity in May: 73%

The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in May
Harlan, IA

Average rainfall in May - Harlan, IA
  • Average rainfall in May: 2.6"

The wettest month (with the highest rainfall) is June (2.64").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in May
Harlan, IA

Average rainfall days in May - Harlan, IA
  • Average rainfall days in May: 15.7 days

The month with the highest number of rainy days is June (16.1 days).
The month with the least rainy days is February (2.8 days).

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Average snowfall in May
Harlan, IA

Average snowfall in May - Harlan, IA
  • Average snowfall in May: 0.16"

The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Harlan, IA

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

Average daylight in May / Average sunshine in May - Harlan, IA
  • Average daylight in May: 14h and 33min

The month with the longest days is June (Average daylight: 15h and 9min).
The month with the shortest days is December (Average daylight: 9h and 13min).

  • Average sunshine in May: 8.8h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4.5h).

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Average sunshine days in May
Harlan, IA

Average sunshine days in May - Harlan, IA
  • Average sunshine days in May: 12.8 days

The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (11.4 days).

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Average UV index in May
Harlan, IA

Average UV index in May - Harlan, IA
  • Average UV index in May: 5

The months with the highest UV index are June, July and August (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
Harlan, IA

Average cloud cover in May - Harlan, IA
  • Average cloud cover in May: 40

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 27).

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Average visibility in May
Harlan, IA

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

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

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