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
In Rock Falls, stepping into May brings a temperature increase, moving up from April's cool 54.9°F (12.7°C) to an enjoyable 66.9°F (19.4°C). During May, Rock Falls records a consistent average nighttime temperature of 50.5°F (10.3°C).Humidity
The average relative humidity in May is 75%.Rainfall
In Rock Falls, Iowa, in May, it is raining for 16.7 days, with typically 3.35" (85mm) of accumulated precipitation. Throughout the year, there are 129.5 rainfall days, and 25.98" (660mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows in Rock Falls, Iowa. During 0.3 snowfall days, in May, Rock Falls aggregates 0.39" (10mm) of snow. In Rock Falls, during the entire year, snow falls for 50.1 days and aggregates up to 21.69" (551mm) of snow.Daylight
In Rock Falls, the average length of the day in May is 14h and 42min.On the first day of May in Rock Falls, Iowa, sunrise is at 6:04 am and sunset at 8:14 pm. On the last day of the month, sunrise is at 5:35 am and sunset at 8:45 pm CDT.
Sunshine
The average sunshine in May in Rock Falls is 8.4h.UV index
In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum UV index of 5 in May translates into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May in Rock Falls?
What is the average humidity in May in Rock Falls?
How much does it rain in Rock Falls in May?
What is the last month it snows in Rock Falls?
What is the average length of the day in May in Rock Falls?
What time are sunrise and sunset in May in Rock Falls?
How long on average sun shines in May in Rock Falls?
How high is the UV index in May in Rock Falls?
Average temperature in May
Rock Falls, IA
- Average high temperature in May: 66.9°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 (22.5°F).
- Average low temperature in May: 50.5°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 (10°F).
Average pressure in May
Rock Falls, IA
- Average pressure in May: 29.93"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Rock Falls, IA
- Average wind speed in May: 9.3mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in May
Rock Falls, IA
- Average humidity in May: 75%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Rock Falls, IA
- Average rainfall in May: 3.35"
The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in May
Rock Falls, IA
- Average rainfall days in May: 16.7 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3 days).
Average snowfall in May
Rock Falls, IA
- Average snowfall in May: 0.39"
The month with the highest snowfall is February (5.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Rock Falls, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Rock Falls, 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 2min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in May
Rock Falls, IA
- Average sunshine days in May: 12.7 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in May
Rock Falls, 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
Rock Falls, IA
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Rock Falls, IA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Rock Falls, Iowa, USA
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