May weather forecast
Promise City, IA

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Weather in May

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

Temperature

May sees a rise in the average high-temperature, climbing from a moderate 60.4°F (15.8°C) in April to a pleasant 69.4°F (20.8°C). Promise City records an average low-temperature of 52.9°F (11.6°C) throughout the month of May.

Humidity

In Promise City, Iowa, the average relative humidity in May is 81%.

Rainfall

In Promise City, in May, it is raining for 16.8 days, with typically 2.76" (70mm) of accumulated precipitation. Throughout the year, there are 125.7 rainfall days, and 20.39" (518mm) of precipitation is accumulated.

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, Promise City aggregates 0.08" (2mm) of snow. In Promise City, during the entire year, snow falls for 28.4 days and aggregates up to 11.34" (288mm) of snow.

Daylight

In May, the average length of the day in Promise City is 14h and 28min.
On the first day of the month, sunrise is at 6:09 am and sunset at 8:09 pm. On the last day of May, sunrise is at 5:43 am and sunset at 8:37 pm CDT.

Sunshine

In Promise City, Iowa, the average sunshine in May is 8.6h.

UV index

The average daily maximum UV index in May in Promise City is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, a regular UV index of 5 translates into these guidelines:
Adopt protective measures - Suggestions to resist sunburn are offered. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
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Frequently asked questions

What is the temperature in May in Promise City?

The high-temperature, in May, in Promise City, records 69.4°F (20.8°C), while the low-temperature is 52.9°F (11.6°C).

What is the average humidity in May in Promise City?

In May, the average relative humidity in Promise City is 81%.

How many days does it rain in May in Promise City?

In Promise City, during May, the rain falls for 16.8 days and regularly aggregates up to 2.76" (70mm) of precipitation.

What is the last month it snows in Promise City?

May is the last month it regularly snows in Promise City, Iowa. During 0.2 snowfall days, in May, Promise City aggregates 0.08" (2mm) of snow.

How many hours of daylight does Promise City have in May?

In May, the average day length in Promise City, Iowa, is 14h and 28min.

When are sunrise and sunset in May in Promise City?

In May, on the first day of the month, sunrise is at 6:09 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 5:43 am and sunset at 8:37 pm CDT.

How long on average sun shines in May in Promise City?

The average sunshine duration in May is 8.6h.

What is the UV index intensity in May in Promise City?

In Promise City, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium health risk from 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
Promise City, IA

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

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in May: 52.9°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

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Average pressure in May
Promise City, IA

Average pressure in May - Promise City, 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 (29.89"Hg).

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Average wind speed in May
Promise City, IA

Average wind speed in May - Promise City, IA
  • Average wind speed in May: 8.8mph

The windiest months (with the highest average wind speed) are January and March (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).

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Average humidity in May
Promise City, IA

Average humidity in May - Promise City, IA
  • Average humidity in May: 81%

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in May
Promise City, IA

Average rainfall in May - Promise City, IA
  • Average rainfall in May: 2.76"

The wettest month (with the highest rainfall) is June (3.31").
The driest months (with the least rainfall) are January and December (0.71").

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Average rainfall days in May
Promise City, IA

Average rainfall days in May - Promise City, IA
  • Average rainfall days in May: 16.8 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).

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Average snowfall in May
Promise City, IA

Average snowfall in May - Promise City, IA
  • Average snowfall in May: 0.08"

The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Promise City, IA

Average snowfall days in May - Promise City, IA
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is January (8.6 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
Promise City, IA

Average daylight in May / Average sunshine in May - Promise City, IA
  • Average daylight in May: 14h and 3min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

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Average sunshine days in May
Promise City, IA

Average sunshine days in May - Promise City, IA
  • Average sunshine days in May: 11.1 days

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.7 days).

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Average UV index in May
Promise City, IA

Average UV index in May - Promise City, IA
  • Average UV index in May: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in May
Promise City, IA

Average cloud cover in May - Promise City, IA
  • Average cloud cover in May: 41

The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July, August and September (Cloud cover 29).

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Average visibility in May
Promise City, IA

Average visibility in May - Promise City, 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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Promise City, Iowa, USA

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