April weather forecast
Keystone, SD

Weather in April

April in Keystone, South Dakota, is a fresh spring month, with an average temperature varying between 50.9°F (10.5°C) and 32.5°F (0.3°C).

Temperature

In Keystone, the average high-temperature in April slightly increases from a frosty 43.9°F (6.6°C) in March to a fresh 50.9°F (10.5°C). In April, in Keystone, the average low-temperature is 32.5°F (0.3°C).

Humidity

In April, the average relative humidity in Keystone is 67%.

Rainfall

In Keystone, during 13.3 rainfall days, 2.32" (59mm) of precipitation is typically accumulated. Throughout the year, there are 135.4 rainfall days, and 20.39" (518mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. The month with the most snowfall in Keystone is April, when snow falls for 8.8 days and typically aggregates up to 7.24" (184mm) of snow.

Daylight

In Keystone, the average length of the day in April is 13h and 29min.
On the first day of April in Keystone, sunrise is at 6:34 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 7:55 pm MDT.

Sunshine

In April, the average sunshine is 9.5h.

UV index

In Keystone, the average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 3 in April transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in April in Keystone?

The average high-temperature, in April, in Keystone, South Dakota, is 50.9°F (10.5°C), while the average low-temperature is 32.5°F (0.3°C).

What is the average humidity in April in Keystone?

In April, the average relative humidity in Keystone is 67%.

How many days does it rain in April in Keystone?

In Keystone, South Dakota, in April, during 13.3 rainfall days, 2.32" (59mm) of precipitation is typically accumulated.

When does it snow the most in Keystone?

April is the month with the most snowfall in Keystone, South Dakota. Snow falls for 8.8 days and accumulates 7.24" (184mm) of snow.

How many days does it snow in April in Keystone?

In Keystone, South Dakota, in April, snow falls for 8.8 days, with typically accumulated 7.24" (184mm) of snow.

What is the average length of the day in April in Keystone?

In Keystone, the average day length in April is 13h and 29min.

When are sunrise and sunset in April in Keystone?

In April, on the first day of the month, sunrise is at 6:34 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 7:55 pm MDT.

How many hours of sunshine does Keystone have in April?

The average sunshine duration in April in Keystone, South Dakota, is 9.5h.

What is the UV index intensity in April in Keystone?

The average daily maximum UV index in April in Keystone, South Dakota, is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Keystone, SD

Average temperature in April - Keystone, SD
  • Average high temperature in April: 50.9°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (29.8°F).

  • Average low temperature in April: 32.5°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).

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Average pressure in April
Keystone, SD

Average pressure in April - Keystone, SD
  • Average pressure in April: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in April
Keystone, SD

Average wind speed in April - Keystone, SD
  • Average wind speed in April: 9.5mph

The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity in April
Keystone, SD

Average humidity in April - Keystone, SD
  • Average humidity in April: 67%

The months with the highest relative humidity are January and February (77%).
The months with the lowest relative humidity are August and September (52%).

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Average rainfall in April
Keystone, SD

Average rainfall in April - Keystone, SD
  • Average rainfall in April: 2.32"

The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in April
Keystone, SD

Average rainfall days in April - Keystone, SD
  • Average rainfall days in April: 13.3 days

The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (4.5 days).

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Average snowfall in April
Keystone, SD

Average snowfall in April - Keystone, SD
  • Average snowfall in April: 7.24"

The month with the highest snowfall is April (7.24").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in April
Keystone, SD

Average snowfall days in April - Keystone, SD
  • Average snowfall days in April: 8.8 days

The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in April /
Average sunshine in April
Keystone, SD

Average daylight in April / Average sunshine in April - Keystone, SD
  • Average daylight in April: 13h and 29min

The month with the longest days is June (Average daylight: 15h and 25min).
The month with the shortest days is December (Average daylight: 8h and 58min).

  • Average sunshine in April: 9h and 30min

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 0min).

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Average sunshine days in April
Keystone, SD

Average sunshine days in April - Keystone, SD
  • Average sunshine days in April: 9.8 days

The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (7.8 days).

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Average UV index in April
Keystone, SD

Average UV index in April - Keystone, SD
  • Average UV index in April: 3

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

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Average cloud cover in April
Keystone, SD

Average cloud cover in April - Keystone, SD
  • Average cloud cover in April: 38

The month with the most cloud cover is April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 17).

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Average visibility in April
Keystone, SD

Average visibility in April - Keystone, SD
  • Average visibility in April: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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