April weather forecastCastlewood, SD
April
Weather in April
April in Castlewood, South Dakota, is a cool spring month, with an average temperature varying between 51.6°F (10.9°C) and 35.2°F (1.8°C).Temperature
With the onset of April, Castlewood's weather sees a temperature rise, transitioning from a cold 38.1°F (3.4°C) in March to a cool 51.6°F (10.9°C). Throughout April, an average nighttime temperature of 35.2°F (1.8°C) is experienced.Humidity
The average relative humidity in April is 70%.Rainfall
In April, the rain falls for 11.6 days. Throughout April, 1.46" (37mm) of precipitation is 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 April, it is snowing for 4.8 days. Throughout April, 1.46" (37mm) of snow is accumulated. In Castlewood, during the entire year, snow falls for 64.3 days and aggregates up to 17.56" (446mm) of snow.Daylight
The average length of the day in April is 13h and 31min.On the first day of the month, sunrise is at 7:07 am and sunset at 7:56 pm. On the last day of April, sunrise is at 6:18 am and sunset at 8:32 pm CDT.
Sunshine
The average sunshine in April is 7.5h.UV index
In Castlewood, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The average daily UV index of 3 in April transforms into the following instructions:
Undertake protective steps - Preventing sun damage is advised. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Castlewood, SD
- Average high temperature in April: 51.6°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 April: 35.2°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 April
Castlewood, SD
- Average pressure in April: 29.95"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 April
Castlewood, SD
- Average wind speed in April: 11.6mph
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 April
Castlewood, SD
- Average humidity in April: 70%
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 April
Castlewood, SD
- Average rainfall in April: 1.46"
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 April
Castlewood, SD
- Average rainfall days in April: 11.6 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 April
Castlewood, SD
- Average snowfall in April: 1.46"
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 April
Castlewood, SD
- Average snowfall days in April: 4.8 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 April /
Average sunshine in April
Castlewood, SD
- Average daylight in April: 13h and 30min
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 April: 7h and 30min
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 April
Castlewood, SD
- Average sunshine days in April: 12.8 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 April
Castlewood, SD
- Average UV index in April: 3
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 April
Castlewood, SD
- Average cloud cover in April: 48
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 April
Castlewood, SD
- Average visibility in April: 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).
