May weather forecastCastlewood, SD
May
Weather in May
May, the last month of the spring in Castlewood, is an enjoyable month, with an average temperature varying between 46.9°F (8.3°C) and 64.6°F (18.1°C).Temperature
May brings a rise in the average high-temperature, transitioning from April's cool 51.6°F (10.9°C) to a comfortable 64.6°F (18.1°C). An average low-temperature of 46.9°F (8.3°C) is noted during the month of May.Humidity
The average relative humidity in May is 71%.Rainfall
In Castlewood, in May, during 16.3 rainfall days, 2.52" (64mm) of precipitation is typically accumulated. Throughout the year, there are 112.3 rainfall days, and 18.78" (477mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Castlewood. May is the last month it regularly snows. During 0.8 snowfall days, in May, Castlewood aggregates 0.12" (3mm) of snow. Throughout the year, there are 64.3 snowfall days, and 17.56" (446mm) of snow is accumulated.Daylight
In May, the average length of the day is 14h and 51min.On the first day of May, sunrise is at 6:16 am and sunset at 8:33 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 9:06 pm CDT.
Sunshine
In Castlewood, the average sunshine in May is 8.7h.UV index
In Castlewood, South Dakota, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 5 during May translates into the following directions:
Prioritize safety - Suggestions to prevent sun damage are offered. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Castlewood, SD
- Average high temperature in May: 64.6°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (19.4°F).
- Average low temperature in May: 46.9°F
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (5.5°F).
Average pressure in May
Castlewood, SD
- Average pressure in May: 29.92"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in May
Castlewood, SD
- Average wind speed in May: 10.3mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).
Average humidity in May
Castlewood, SD
- Average humidity in May: 71%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are September and October (68%).
Average rainfall in May
Castlewood, SD
- Average rainfall in May: 2.52"
The wettest month (with the highest rainfall) is June (3.19").
The driest months (with the least rainfall) are January and February (0.59").
Average rainfall days in May
Castlewood, SD
- Average rainfall days in May: 16.3 days
The month with the highest number of rainy days is June (17.2 days).
The month with the least rainy days is February (2.7 days).
Average snowfall in May
Castlewood, SD
- Average snowfall in May: 0.12"
The months with the highest snowfall are January and December (3.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Castlewood, SD
- Average snowfall days in May: 0.8 days
The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Castlewood, SD
- Average daylight in May: 14h and 48min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in May: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in May
Castlewood, SD
- Average sunshine days in May: 11.9 days
The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in May
Castlewood, SD
- 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
Castlewood, SD
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in May
Castlewood, SD
- 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).
