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 marks a rise in the average high-temperature, moving from April's mild 60.4°F (15.8°C) to a pleasant 71.8°F (22.1°C). Throughout May, Potomac experiences a low-temperature average of 55°F (12.8°C).Humidity
In Potomac, the average relative humidity in May is 78%.Rainfall
The month with the most rainfall is May, when the rain falls for 16.6 days and typically aggregates up to 2.76" (70mm) of precipitation.Snowfall
May through October are months without snowfall in Potomac, Illinois.Daylight
In Potomac, the average length of the day in May is 14h and 26min.On the first day of May in Potomac, sunrise is at 5:49 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:14 pm CDT.
Sunshine
In Potomac, Illinois, the average sunshine in May is 8.7h.UV index
In Potomac, Illinois, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In May, the maximum UV index of 5 transforms into these recommendations:
Take precautions - Protection against sunburn is recommended. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May in Potomac?
What is the average humidity in May in Potomac?
What is the wettest month in Potomac?
How many days does it rain in May in Potomac?
When it does not snow in Potomac?
Does it snow in Potomac in May?
How many hours of daylight does Potomac have in May?
What time are sunrise and sunset in May in Potomac?
How many hours of sunshine does Potomac have in May?
What is the UV index reading in May in Potomac?
Average temperature in May
Potomac, IL
- Average high temperature in May: 71.8°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in May: 55°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in May
Potomac, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Potomac, IL
- Average wind speed in May: 8.7mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in May
Potomac, IL
- Average humidity in May: 78%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Potomac, IL
- Average rainfall in May: 2.76"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in May
Potomac, IL
- Average rainfall days in May: 16.6 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is February (6.7 days).
Average snowfall in May
Potomac, IL
- Average snowfall in May: 0"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Potomac, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (9.8 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
Potomac, IL
- Average daylight in May: 14h and 2min
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 24min).
- Average sunshine in May: 8h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
Potomac, IL
- Average sunshine days in May: 10.4 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in May
Potomac, 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
Potomac, IL
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are June, August and September (Cloud cover 33).
Average visibility in May
Potomac, 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).
Potomac, Illinois, USA
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