October weather forecast
Jefferson, SD

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Weather in October

October, the same as September, in Jefferson, South Dakota, is a moderate autumn month, with an average temperature varying between 43.3°F (6.3°C) and 59.9°F (15.5°C).

Temperature

As Jefferson transitions into October, a noticeable drop in the average high-temperature is observed, falling from a moderately hot 76.1°F (24.5°C) in September to a refreshing 59.9°F (15.5°C). During October, the nighttime temperature averages to a frosty 43.3°F (6.3°C).

Humidity

October is the least humid month in Jefferson, with an average relative humidity of 65%.

Rainfall

In Jefferson, in October, it is raining for 9.5 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, there are 122 rainfall days, and 21.61" (549mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. October is the first month it typically snows. Throughout October, in the average 0.7 snowfall days, it receives 0.28" (7mm) of snow. In Jefferson, during the entire year, snow falls for 38 days and aggregates up to 13.23" (336mm) of snow.

Daylight

In Jefferson, South Dakota, the average length of the day in October is 11h and 2min.
On the first day of October, sunrise is at 7:24 am and sunset at 7:07 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 6:19 pm CDT.

Sunshine

The average sunshine in October is 6.3h.

UV index

In October, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 3 in October converts into the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.

Frequently asked questions

What are October temperatures?

October temperatures vary between a high-temperature of 59.9°F (15.5°C) and a low-temperature of 43.3°F (6.3°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 87.8°F (31°C).

What is the least humid month?

October is the least humid month, with an average relative humidity of 65%.

What is the average humidity in October?

In Jefferson, the average relative humidity in October is 65%.

How many days does it rain in October?

In Jefferson, in October, during 9.5 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When does it start snowing in Jefferson?

October is the first month it typically snows. Throughout October, in the average 0.7 snowfall days, it receives 0.28" (7mm) of snow.

What is the average length of the day in October?

In Jefferson, the average day length in October is 11h and 2min.

When are sunrise and sunset in October?

In October, on the first day of the month, sunrise is at 7:24 am and sunset at 7:07 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 6:19 pm CDT.

How many hours of sunshine does Jefferson have in October?

In October, the average sunshine duration is 6.3h.

How high is the UV index in October?

In Jefferson, the average daily maximum UV index in October is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Jefferson, SD

Average temperature in October - Jefferson, SD
  • Average high temperature in October: 59.9°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in October: 43.3°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).

Average pressure in October
Jefferson, SD

Average pressure in October - Jefferson, SD
  • Average pressure in October: 30"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed in October
Jefferson, SD

Average wind speed in October - Jefferson, SD
  • Average wind speed in October: 10.2mph

The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).

Average humidity in October
Jefferson, SD

Average humidity in October - Jefferson, SD
  • Average humidity in October: 65%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (65%).

Average rainfall in October
Jefferson, SD

Average rainfall in October - Jefferson, SD
  • Average rainfall in October: 1.85"

The wettest months (with the highest rainfall) are May and June (3.03").
The driest month (with the least rainfall) is February (0.67").

Average rainfall days in October
Jefferson, SD

Average rainfall days in October - Jefferson, SD
  • Average rainfall days in October: 9.5 days

The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3.3 days).

Average snowfall in October
Jefferson, SD

Average snowfall in October - Jefferson, SD
  • Average snowfall in October: 0.28"

The month with the highest snowfall is January (2.95").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in October
Jefferson, SD

Average snowfall days in October - Jefferson, SD
  • Average snowfall days in October: 0.7 days

The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in October /
Average sunshine in October
Jefferson, SD

Average daylight in October / Average sunshine in October - Jefferson, SD
  • Average daylight in October: 11h and 0min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in October: 6h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in October
Jefferson, SD

Average sunshine days in October - Jefferson, SD
  • Average sunshine days in October: 18.7 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (9.7 days).

Average UV index in October
Jefferson, SD

Average UV index in October - Jefferson, SD
  • Average UV index in October: 3

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in October
Jefferson, SD

Average cloud cover in October - Jefferson, SD
  • Average cloud cover in October: 33

The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 26).

Average visibility in October
Jefferson, SD

Average visibility in October - Jefferson, 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).

Jefferson, South Dakota, USA

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