May weather forecast
Griffen, IA

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Weather in May

The last month of the spring, May, is a pleasant month in Griffen, Iowa, with an average temperature fluctuating between 53.1°F (11.7°C) and 69.4°F (20.8°C).

Temperature

May's arrival sees a rise in the average high-temperature, jumping from April's moderate 58.6°F (14.8°C) to a pleasant 69.4°F (20.8°C). The nights of May anticipate an average low-temperature of 53.1°F (11.7°C).

Humidity

In Griffen, Iowa, the average relative humidity in May is 75%.

Rainfall

In Griffen, in May, it is raining for 16.5 days, with typically 3.23" (82mm) of accumulated precipitation. Throughout the year, there are 123.3 rainfall days, and 20.98" (533mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows in Griffen. During 0.3 snowfall days, in May, Griffen aggregates 0.31" (8mm) of snow. Throughout the year, in Griffen, there are 39.9 snowfall days, and 10.91" (277mm) of snow is accumulated.

Daylight

The average length of the day in May in Griffen is 14h and 36min.
On the first day of May in Griffen, sunrise is at 6:09 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 8:44 pm CDT.

Sunshine

The average sunshine in May in Griffen is 8.6h.

UV index

In May, the average daily maximum UV index in Griffen, Iowa, is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index, 5 in May, converts into the following recommendations:
Take precautions - Protection against skin and eye damage is obliged. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the temperature in May in Griffen?

The high-temperature, in May, in Griffen, records 69.4°F (20.8°C), while the low-temperature is 53.1°F (11.7°C).

What is the average humidity in May in Griffen?

The average relative humidity in May in Griffen is 75%.

How many days does it rain in May in Griffen?

In Griffen, Iowa, in May, during 16.5 rainfall days, 3.23" (82mm) of precipitation is typically accumulated.

What is the last month it snows in Griffen?

May is the last month it regularly snows. During 0.3 snowfall days, in May, Griffen aggregates 0.31" (8mm) of snow.

How many hours of daylight does Griffen have in May?

The average day length in May in Griffen, Iowa, is 14h and 36min.

When is the sunrise / sunset in May in Griffen?

On the first day of May in Griffen, Iowa, sunrise is at 6:09 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 8:44 pm CDT.

How many hours of sunshine does Griffen have in May?

The average sunshine duration in May in Griffen, Iowa, is 8.6h.

What is the UV index reading in May in Griffen?

In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
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
Griffen, IA

Average temperature in May - Griffen, IA
  • Average high temperature in May: 69.4°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 (26.4°F).

  • Average low temperature in May: 53.1°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).

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Average pressure in May
Griffen, IA

Average pressure in May - Griffen, 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
Griffen, IA

Average wind speed in May - Griffen, 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
Griffen, IA

Average humidity in May - Griffen, IA
  • Average humidity in May: 75%

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
Griffen, IA

Average rainfall in May - Griffen, IA
  • Average rainfall in May: 3.23"

The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is January (0.67").

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Average rainfall days in May
Griffen, IA

Average rainfall days in May - Griffen, IA
  • Average rainfall days in May: 16.5 days

The month with the highest number of rainy days is June (17.4 days).
The month with the least rainy days is February (3.2 days).

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Average snowfall in May
Griffen, IA

Average snowfall in May - Griffen, IA
  • Average snowfall in May: 0.31"

The month with the highest snowfall is February (3.07").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Griffen, IA

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

The month with the highest number of snowfall days is January (10.9 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
Griffen, IA

Average daylight in May / Average sunshine in May - Griffen, 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 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in May
Griffen, IA

Average sunshine days in May - Griffen, IA
  • Average sunshine days in May: 12 days

The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is June (10.5 days).

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Average UV index in May
Griffen, IA

Average UV index in May - Griffen, 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
Griffen, IA

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

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 30).

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Average visibility in May
Griffen, IA

Average visibility in May - Griffen, 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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Griffen, Iowa, USA

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