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 brings a temperature increase, with average high-temperatures moving from April's cool 54.9°F (12.7°C) to a comfortable 67.5°F (19.7°C). Nightly temperatures drop to an average low of 51.4°F (10.8°C) in May.Humidity
In Crystal Lake, the average relative humidity in May is 72%.Rainfall
In Crystal Lake, Iowa, in May, during 18.3 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Crystal Lake, during the entire year, the rain falls for 136.2 days and collects up to 25.39" (645mm) 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, Crystal Lake aggregates 0.43" (11mm) of snow. In Crystal Lake, during the entire year, snow falls for 55.1 days and aggregates up to 22.05" (560mm) of snow.Daylight
In May, the average length of the day is 14h and 42min.On the first day of May, sunrise is at 6:07 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:47 pm CDT.
Sunshine
The average sunshine in May is 8.5h.UV index
In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The daily maximum UV index of 5 in May interprets into the following advice:
Be vigilant - Suggestions to stave off sun damage are provided. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature?
What is the average humidity in May?
How much does it rain in May?
What is the last month it snows?
What is the average length of the day in May in Crystal Lake?
When are sunrise and sunset in May?
How many hours of sunshine does Crystal Lake have in May?
How high is the UV index in May?
Average temperature in May
Crystal Lake, IA
- Average high temperature in May: 67.5°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (22.1°F).
- Average low temperature in May: 51.4°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure in May
Crystal Lake, IA
- Average pressure in May: 29.93"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Crystal Lake, IA
- Average wind speed in May: 9.5mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in May
Crystal Lake, IA
- Average humidity in May: 72%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Crystal Lake, IA
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is June (4.21").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in May
Crystal Lake, IA
- Average rainfall days in May: 18.3 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is February (3 days).
Average snowfall in May
Crystal Lake, IA
- Average snowfall in May: 0.43"
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
Crystal Lake, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Crystal 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 0min).
- Average sunshine in May: 8h and 3min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in May
Crystal Lake, IA
- Average sunshine days in May: 10.8 days
The months with the most sunshine days are October and November (17.4 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in May
Crystal 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 December (UV index 1).
Average cloud cover in May
Crystal Lake, IA
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Crystal Lake, IA
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, September, October and November (6mi).
The months with the lowest visibility are January, February, July, August and December (5mi).
Crystal Lake, Iowa, USA
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