Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May signals a shift in the average high-temperature, moving from April's mild 59.5°F (15.3°C) to an agreeable 69.6°F (20.9°C). In Griswold, the nighttime temperature averages to a cool 52.9°F (11.6°C) during May.Humidity
In May, the average relative humidity in Griswold is 75%.Rainfall
In Griswold, Iowa, in May, during 16.2 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Griswold, during the entire year, the rain falls for 118.7 days and collects up to 20.79" (528mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.3 snowfall days, in May, Griswold aggregates 0.24" (6mm) of snow. In Griswold, during the entire year, snow falls for 32.3 days and aggregates up to 9.41" (239mm) of snow.Daylight
In May, the average length of the day is 14h and 31min.On the first day of the month, sunrise is at 6:16 am and sunset at 8:18 pm. On the last day of May, sunrise is at 5:49 am and sunset at 8:46 pm CDT.
Sunshine
In Griswold, the average sunshine in May is 8.7h.UV index
In Griswold, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In May, the maximum UV index of 5 suggests these recommendations:
Ensure safety - Recommendations to avert sunburn are presented. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Griswold?
What is the average humidity in May in Griswold?
How many days does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
What time are sunrise and sunset in May?
How long on average sun shines in May?
What is the UV index reading in May?
Average temperature in May
Griswold, IA
- Average high temperature in May: 69.6°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 (28.4°F).
- Average low temperature in May: 52.9°F
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in May
Griswold, 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).
Average wind speed in May
Griswold, IA
- Average wind speed in May: 9.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in May
Griswold, IA
- Average humidity in May: 75%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (69%).
Average rainfall in May
Griswold, IA
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is June (3.7").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in May
Griswold, IA
- Average rainfall days in May: 16.2 days
The month with the highest number of rainy days is June (16.4 days).
The month with the least rainy days is February (3.1 days).
Average snowfall in May
Griswold, IA
- Average snowfall in May: 0.24"
The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Griswold, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Griswold, IA
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
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 30min).
Average sunshine days in May
Griswold, IA
- Average sunshine days in May: 11.8 days
The month with the most sunshine days is December (21.2 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in May
Griswold, 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).
Average cloud cover in May
Griswold, IA
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in May
Griswold, 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).
Griswold, Iowa, USA
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