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
As April transitions into May, Lerna sees a rise in the average high-temperature, moving from an enjoyable 62.2°F (16.8°C) to a pleasant 73°F (22.8°C). In the month of May, Lerna witnesses a consistent average low-temperature of 56.7°F (13.7°C).Humidity
In May, the average relative humidity is 79%.Rainfall
In May, the rain falls for 16.8 days. Throughout May, 2.87" (73mm) of precipitation is accumulated. In Lerna, during the entire year, the rain falls for 148 days and collects up to 25.63" (651mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in May is 14h and 22min.On the first day of May, sunrise is at 5:53 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 5:28 am and sunset at 8:13 pm CDT.
Sunshine
The average sunshine in May is 8.8h.UV index
The average daily maximum UV index in May in Lerna is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 5 during May leads to these instructions:
Put precautions into practice - Guidance to elude sunburn is provided. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Lerna in May?
What is the average humidity in May?
How many days does it rain in May?
When it does not snow?
Does it snow in May?
How many hours of daylight does Lerna have in May?
What time are sunrise and sunset in May in Lerna?
How long on average sun shines in May?
What is the UV index reading in May?
Average temperature in May
Lerna, IL
- Average high temperature in May: 73°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in May: 56.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in May
Lerna, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Lerna, IL
- Average wind speed in May: 8.6mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in May
Lerna, IL
- Average humidity in May: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Lerna, IL
- Average rainfall in May: 2.87"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in May
Lerna, IL
- 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 February (7.8 days).
Average snowfall in May
Lerna, IL
- Average snowfall in May: 0"
The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Lerna, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Lerna, IL
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 8h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in May
Lerna, IL
- Average sunshine days in May: 11.2 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in May
Lerna, IL
- 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 December (UV index 1).
Average cloud cover in May
Lerna, IL
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility in May
Lerna, IL
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Lerna, Illinois, USA
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