Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
Keystone marks the arrival of August with an average high-temperature of a still moderately hot 80.1°F (26.7°C), hardly different from July's 81.7°F (27.6°C). During August, Keystone notes a substantial drop from the daytime peak to an average minimum temperature of 58.3°F (14.6°C).Humidity
The months with the lowest humidity in Keystone, South Dakota, are August and September, with an average relative humidity of 52%.Rainfall
In Keystone, in August, during 16.6 rainfall days, 2.56" (65mm) of precipitation is typically accumulated. In Keystone, during the entire year, the rain falls for 135.4 days and collects up to 20.39" (518mm) of precipitation.Snowfall
In Keystone, snow does not fall in June through August.Daylight
In August, the average length of the day in Keystone is 13h and 56min.On the first day of August in Keystone, sunrise is at 5:43 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 7:30 pm MDT.
Sunshine
The month with the most sunshine in Keystone is August, with an average of 11.7h of sunshine.UV index
In August, the average daily maximum UV index in Keystone is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 5 in August translates into this advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. UV radiation from the Sun is most dangerous during midday; take precautions and seek 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.
Frequently asked questions
What are the temperatures in Keystone in August?
What are the least humid months in Keystone?
What is the average humidity in August in Keystone?
How much does it rain in Keystone in August?
When it does not snow in Keystone?
Does it snow in Keystone in August?
What is the average length of the day in August in Keystone?
When are sunrise and sunset in August in Keystone?
What month has the most sunshine in Keystone?
How many hours of sunshine does Keystone have in August?
How high is the UV index in August in Keystone?
Average temperature in August
Keystone, SD
- Average high temperature in August: 80.1°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 August: 58.3°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).
Average pressure in August
Keystone, SD
- Average pressure in August: 29.9"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).
Average wind speed in August
Keystone, SD
- Average wind speed in August: 7mph
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).
Average humidity in August
Keystone, SD
- Average humidity in August: 52%
The months with the highest relative humidity are January and February (77%).
The months with the lowest relative humidity are August and September (52%).
Average rainfall in August
Keystone, SD
- Average rainfall in August: 2.56"
The wettest month (with the highest rainfall) is June (3.19").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in August
Keystone, SD
- Average rainfall days in August: 16.6 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).
Average snowfall in August
Keystone, SD
- Average snowfall in August: 0"
The month with the highest snowfall is April (7.24").
The months with the least snowfall are June, July and August (0").
Average snowfall days in August
Keystone, SD
- Average snowfall days in August: 0 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).
Average daylight in August /
Average sunshine in August
Keystone, SD
- Average daylight in August: 13h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in August: 11h and 4min
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).
Average sunshine days in August
Keystone, SD
- Average sunshine days in August: 9.9 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).
Average UV index in August
Keystone, SD
- Average UV index in August: 5
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).
Average cloud cover in August
Keystone, SD
- Average cloud cover in August: 17
The month with the most cloud cover is April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in August
Keystone, SD
- Average visibility in August: 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).
Keystone, South Dakota, USA
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