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
A shift in the average high-temperature is noticeable in May, changing from a fresh 54.7°F (12.6°C) in April to a refreshing 67.1°F (19.5°C). Throughout May, an average low-temperature of 50°F (10°C) is experienced.Humidity
In May, the average relative humidity in Crystal Lake is 79%.Rainfall
In Crystal Lake, in May, it is raining for 17.1 days, with typically 2.52" (64mm) of accumulated precipitation. In Crystal Lake, during the entire year, the rain falls for 146.9 days and collects up to 21.22" (539mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Crystal Lake aggregates 0.08" (2mm) of snow. In Crystal Lake, Illinois, during the entire year, snow falls for 48.7 days and aggregates up to 11.85" (301mm) of snow.Daylight
In Crystal Lake, the average length of the day in May is 14h and 37min.On the first day of May, sunrise is at 5:47 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:19 am and sunset at 8:22 pm CDT.
Sunshine
In May, the average sunshine is 8.5h.UV index
In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: An average maximum UV index of 5 in May leads to these recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. To guard against the harmful effects of the Sun, minimize exposure during midday. Enhance your sun protection with tightly woven, yet airy clothing. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Crystal Lake in May?
What is the average humidity in May?
How many days does it rain in May?
What is the last month it snows?
How many hours of daylight does Crystal Lake have in May?
When is the sunrise / sunset in May?
How long on average sun shines in May?
What is the UV index reading in May?
Average temperature in May
Crystal Lake, IL
- Average high temperature in May: 67.1°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in May: 50°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in May
Crystal Lake, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Crystal Lake, IL
- Average wind speed in May: 8.3mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in May
Crystal Lake, IL
- Average humidity in May: 79%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April and October (76%).
Average rainfall in May
Crystal Lake, IL
- Average rainfall in May: 2.52"
The wettest month (with the highest rainfall) is June (2.8").
The driest months (with the least rainfall) are November and December (0.94").
Average rainfall days in May
Crystal Lake, IL
- Average rainfall days in May: 17.1 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in May
Crystal Lake, IL
- Average snowfall in May: 0.08"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Crystal Lake, IL
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is January (12.5 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, IL
- 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 3min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
Crystal Lake, IL
- Average sunshine days in May: 10.7 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is July (10 days).
Average UV index in May
Crystal Lake, IL
- Average UV index in May: 5
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Crystal Lake, IL
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and September (Cloud cover 32).
Average visibility in May
Crystal Lake, IL
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January, February and August (5mi).
Crystal Lake, Illinois, USA
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