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's arrival signals an increase in average high-temperatures, moving from April's mild 55.4°F (13°C) to a still refreshing 66°F (18.9°C). Against the high May temperatures, Rock Island records an average drop to a chilly 43.3°F (6.3°C) at night.Humidity
The average relative humidity in May is 57%.Rainfall
In Rock Island, in May, it is raining for 10.8 days, with typically 1.18" (30mm) of accumulated precipitation. Throughout the year, there are 111.7 rainfall days, and 10.71" (272mm) of precipitation is accumulated.Snowfall
May through August and October are months without snowfall.Daylight
The average length of the day in May in Rock Island is 15h and 8min.On the first day of the month, sunrise is at 5:42 am and sunset at 8:12 pm. On the last day of May, sunrise is at 5:07 am and sunset at 8:49 pm PDT.
Sunshine
The average sunshine in May is 11h.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 exposure to the Sun's UV radiation for the ordinary person.Note: In May, a daily maximum UV index of 5 leads to the following instructions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Rock Island 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?
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 in Rock Island?
What is the UV index intensity in May?
Average temperature in May
Rock Island, WA
- Average high temperature in May: 66°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (32.4°F).
- Average low temperature in May: 43.3°F
The month with the highest average low temperature is August (56.3°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in May
Rock Island, WA
- 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 August (29.93"Hg).
Average wind speed in May
Rock Island, WA
- Average wind speed in May: 6mph
The windiest month (with the highest average wind speed) is June (6.5mph).
The calmest month (with the lowest average wind speed) is December (3.7mph).
Average humidity in May
Rock Island, WA
- Average humidity in May: 57%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are July and August (44%).
Average rainfall in May
Rock Island, WA
- Average rainfall in May: 1.18"
The wettest months (with the highest rainfall) are January and December (1.57").
The driest months (with the least rainfall) are July and August (0.24").
Average rainfall days in May
Rock Island, WA
- Average rainfall days in May: 10.8 days
The month with the highest number of rainy days is March (13.8 days).
The month with the least rainy days is August (3.8 days).
Average snowfall in May
Rock Island, WA
- Average snowfall in May: 0"
The month with the highest snowfall is December (5.98").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in May
Rock Island, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is December (9.5 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in May /
Average sunshine in May
Rock Island, WA
- Average daylight in May: 15h and 1min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in May: 11h and 0min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in May
Rock Island, WA
- Average sunshine days in May: 18.1 days
The month with the most sunshine days is July (25.5 days).
The month with the least sunshine days is February (12.6 days).
Average UV index in May
Rock Island, WA
- Average UV index in May: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Rock Island, WA
- Average cloud cover in May: 26
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in May
Rock Island, WA
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Rock Island, Washington, USA
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