October weather forecastKeystone, SD
October
Weather in October
October is a transitional period for Keystone city weather with decreasing temperatures and a remarkable increase in rainfall rates. A significant drop in average temperature is noted with highs of around 54°F (12.2°C), indicating the gradual onset of winter. Instances of rain are common in the city during this month, leading to damp conditions. While the daylight hours decrease, the colorful spectacle of fall foliage remains a highlight for October's weather. As October gives way to November, the cooling trend continues and prepares the city for the forthcoming winter.Temperature
A clear decrease in the average high-temperature is observed during October, decreasing from an agreeable 71.4°F (21.9°C) in September to a fresh 54°F (12.2°C). Throughout October, the temperature tends to fall to a consistent average low of 36.7°F (2.6°C).Humidity
In October, the average relative humidity is 61%.Rainfall
In Keystone, South Dakota, in October, during 9 rainfall days, 1.14" (29mm) 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. In Keystone, during October, snow falls for 5.3 days and regularly aggregates up to 3.66" (93mm) of snow. In Keystone, during the entire year, snow falls for 75.1 days and aggregates up to 40.24" (1022mm) of snow.Daylight
The average length of the day in October is 10h and 59min.On the first day of the month, sunrise is at 6:52 am and sunset at 6:33 pm. On the last day of October, sunrise is at 7:29 am and sunset at 5:44 pm MDT.
Sunshine
In October, the average sunshine is 7.1h.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.Note: In October, the maximum UV index of 2 suggests this advice:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
Keystone, SD
- Average high temperature in October: 54°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 October: 36.7°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 October
Keystone, SD
- Average pressure in October: 29.98"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 October
Keystone, SD
- Average wind speed in October: 9.1mph
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 October
Keystone, SD
- Average humidity in October: 61%
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 October
Keystone, SD
- Average rainfall in October: 1.14"
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 October
Keystone, SD
- Average rainfall days in October: 9 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 October
Keystone, SD
- Average snowfall in October: 3.66"
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 October
Keystone, SD
- Average snowfall days in October: 5.3 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 October /
Average sunshine in October
Keystone, SD
- Average daylight in October: 11h and 0min
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 October: 7h and 6min
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 October
Keystone, SD
- Average sunshine days in October: 17.4 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 October
Keystone, SD
- Average UV index in October: 2
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 October
Keystone, SD
- Average cloud cover in October: 27
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 October
Keystone, SD
- Average visibility in October: 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).
