May weather forecast
Storm Lake, IA

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Weather in May

May, in Storm Lake, Iowa, symbolizes the height of spring. With the harshness of winter long gone, blue skies and balmy winds reign supreme. The overall weather can be described as moderate with temperatures stretching from 2.05" (52mm) to 2.72" (69mm). As the month transitions into June, the moderation begins to give way to soaring summer temperatures. It's a prime time for scenic beauty and outdoor activities, from hiking in the local parks to enjoying a boat ride on the lake.

Temperature

In Storm Lake, the average high-temperature in May rises, from a mild 57.2°F (14°C) in April, to a pleasant 68.9°F (20.5°C). Storm Lake, during May nights, observes an average temperature of 52.3°F (11.3°C).

Humidity

The average relative humidity in May in Storm Lake is 69%.

Rainfall

In May, in Storm Lake, the rain falls for 18.7 days. Throughout May, 3.9" (99mm) of precipitation is accumulated. In Storm Lake, during the entire year, the rain falls for 135.1 days and collects up to 26.73" (679mm) 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, Storm Lake aggregates 0.28" (7mm) of snow. In Storm Lake, during the entire year, snow falls for 50 days and aggregates up to 20.04" (509mm) of snow.

Daylight

In Storm Lake, the average length of the day in May is 14h and 38min.
On the first day of the month, sunrise is at 6:14 am and sunset at 8:21 pm. On the last day of May, in Storm Lake, sunrise is at 5:45 am and sunset at 8:51 pm CDT.

Sunshine

The average sunshine in May in Storm Lake, Iowa, is 8.7h.

UV index

The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum UV index of 5 in May translates into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.

Frequently asked questions

What is the temperature in May in Storm Lake?

An average high-temperature, in May, in Storm Lake, is 68.9°F (20.5°C) and the average low-temperature is 52.3°F (11.3°C).

What is the average humidity in May in Storm Lake?

In Storm Lake, the average relative humidity in May is 69%.

How much does it rain in Storm Lake in May?

In May, the rain falls for 18.7 days. Throughout May, 3.9" (99mm) of precipitation is accumulated.

What is the last month it snows in Storm Lake?

May is the last month it regularly snows in Storm Lake, Iowa. During 0.3 snowfall days, in May, Storm Lake aggregates 0.28" (7mm) of snow.

How many hours of daylight does Storm Lake have in May?

The average day length in May is 14h and 38min.

What time are sunrise and sunset in May in Storm Lake?

On the first day of May in Storm Lake, Iowa, sunrise is at 6:14 am and sunset at 8:21 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 8:51 pm CDT.

How long on average sun shines in May in Storm Lake?

In May, the average sunshine duration in Storm Lake, Iowa, is 8.7h.

What is the UV index reading in May in Storm Lake?

In May, the average daily maximum UV index in Storm Lake, Iowa, is 5. A UV Index 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
Storm Lake, IA

Average temperature in May - Storm Lake, IA
  • Average high temperature in May: 68.9°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (24.6°F).

  • Average low temperature in May: 52.3°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).

Average pressure in May
Storm Lake, IA

Average pressure in May - Storm Lake, 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 (29.87"Hg).

Average wind speed in May
Storm Lake, IA

Average wind speed in May - Storm Lake, IA
  • Average wind speed in May: 9.6mph

The windiest months (with the highest average wind speed) are January and April (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).

Average humidity in May
Storm Lake, IA

Average humidity in May - Storm Lake, IA
  • Average humidity in May: 69%

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are April and October (68%).

Average rainfall in May
Storm Lake, IA

Average rainfall in May - Storm Lake, IA
  • Average rainfall in May: 3.9"

The wettest month (with the highest rainfall) is June (4.02").
The driest month (with the least rainfall) is January (0.91").

Average rainfall days in May
Storm Lake, IA

Average rainfall days in May - Storm Lake, IA
  • Average rainfall days in May: 18.7 days

The month with the highest number of rainy days is June (19 days).
The month with the least rainy days is February (3.7 days).

Average snowfall in May
Storm Lake, IA

Average snowfall in May - Storm Lake, IA
  • Average snowfall in May: 0.28"

The month with the highest snowfall is February (5.79").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
Storm Lake, IA

Average snowfall days in May - Storm Lake, IA
  • Average snowfall days in May: 0.3 days

The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Storm Lake, IA

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

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

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in May
Storm Lake, IA

Average sunshine days in May - Storm Lake, IA
  • Average sunshine days in May: 9.8 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is June (8.1 days).

Average UV index in May
Storm Lake, IA

Average UV index in May - Storm Lake, 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 and February (UV index 1).

Average cloud cover in May
Storm Lake, IA

Average cloud cover in May - Storm Lake, IA
  • Average cloud cover in May: 41

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in May
Storm Lake, IA

Average visibility in May - Storm Lake, IA
  • Average visibility in May: 6mi

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

Storm Lake, Iowa, USA

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