May weather forecastRockwell City, IA
May
Weather in May
May witnesses a significant boost in temperature levels from April, with the mercury peaking close to the 70°F (21.1°C) mark. The weather in Rockwell City is comparably balmy, perfect for picnics or strolling through the parks. With humidity hovering around 71%, the air becomes noticeably thicker. One could anticipate a bright and sunny day with increased sunshine hours compared to the cooler months. However, May also comes with the highest rainfall levels reaching up to 3.9" (99mm), promising many spellbinding rainbows after quick showers.Temperature
May's arrival in Rockwell City signals a temperature shift, moving from a refreshing 57.7°F (14.3°C) in April to a pleasant 69.3°F (20.7°C). In Rockwell City, the expected average low-temperature for May is a cool 53.1°F (11.7°C).Humidity
The average relative humidity in May in Rockwell City is 71%.Rainfall
In Rockwell City, in May, during 17.1 rainfall days, 3.9" (99mm) of precipitation is typically accumulated. Throughout the year, in Rockwell City, there are 128 rainfall days, and 26.18" (665mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Rockwell City. May is the last month it regularly snows. During 0.3 snowfall days, in May, Rockwell City aggregates 0.24" (6mm) of snow. Throughout the year, there are 39.2 snowfall days, and 17.64" (448mm) of snow is accumulated.Daylight
In Rockwell City, the average length of the day in May is 14h and 37min.On the first day of the month, sunrise is at 6:12 am and sunset at 8:18 pm. On the last day of May, sunrise is at 5:44 am and sunset at 8:48 pm CDT.
Sunshine
In Rockwell City, the average sunshine in May is 8.6h.UV index
The average daily maximum UV index in May in Rockwell City is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: A daily high UV index of 5 in May leads to these guidelines:
Act with care - The suggestion to avoid sunburn is emphasized. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Rockwell City, IA
- Average high temperature in May: 69.3°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 (25.2°F).
- Average low temperature in May: 53.1°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).
Average pressure in May
Rockwell City, IA
- Average pressure in May: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Rockwell City, IA
- Average wind speed in May: 9.4mph
The windiest months (with the highest average wind speed) are January and April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in May
Rockwell City, IA
- Average humidity in May: 71%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are April and October (68%).
Average rainfall in May
Rockwell City, IA
- Average rainfall in May: 3.9"
The wettest month (with the highest rainfall) is June (3.98").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in May
Rockwell City, IA
- Average rainfall days in May: 17.1 days
The month with the highest number of rainy days is June (17.6 days).
The month with the least rainy days is February (3 days).
Average snowfall in May
Rockwell City, IA
- Average snowfall in May: 0.24"
The month with the highest snowfall is February (5.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Rockwell City, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Rockwell City, IA
- Average daylight in May: 14h and 36min
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 6min).
- Average sunshine in May: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in May
Rockwell City, IA
- Average sunshine days in May: 11.9 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is June (9.9 days).
Average UV index in May
Rockwell City, IA
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in May
Rockwell City, IA
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in May
Rockwell City, IA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
