January weather forecastWestport, SD

January

Weather in January

January, the same as December, in Westport, South Dakota, is a freezing cold winter month, with an average temperature varying between 20.7°F (-6.3°C) and 6.3°F (-14.3°C).

Temperature

January, with its average high-temperature of 20.7°F (-6.3°C) and an average low-temperature of 6.3°F (-14.3°C), holds the record as the coldest month.

Humidity

January is the most humid month in Westport, South Dakota, with an average relative humidity of 88%.

Rainfall

January is the month with the least rainfall. Rain falls for 3 days and accumulates 0.59" (15mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. January is the month with the most snowfall in Westport. Snow falls for 13 days and accumulates 3.82" (97mm) of snow.

Daylight

In Westport, South Dakota, the average length of the day in January is 9h and 10min.
On the first day of January in Westport, sunrise is at 8:14 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 5:38 pm CST.

Sunshine

January has the least sunshine of the year in Westport, South Dakota, with an average of 3.9h of sunshine.

UV index

January, February and November, with an average maximum UV index of 1, are months with the lowest UV index in Westport. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: In January, the UV index of 1 transforms into the following advice:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.

Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

January, characterized by an average high temperature of 20.7°F (-6.3°C) and a low temperature of 6.3°F (-14.3°C), is generally the coldest month in Westport, South Dakota.

In January, in Westport, the average high-temperature is 20.7°F (-6.3°C), and the average low-temperature is 6.3°F (-14.3°C).

The most humid month in Westport, South Dakota, is January, with an average relative humidity of 88%.

In Westport, the average relative humidity in January is 88%.

The month with the least rainfall in Westport is January, when the rain falls for 3 days and typically collects 0.59" (15mm) of precipitation.

In January, in Westport, South Dakota, the rain falls for 3 days. Throughout January, 0.59" (15mm) of precipitation is accumulated.

January is the month with the most snowfall in Westport, South Dakota. Snow falls for 13 days and accumulates 3.82" (97mm) of snow.

In Westport, South Dakota, in January, snow falls for 13 days, with typically accumulated 3.82" (97mm) of snow.

In January, the average day length is 9h and 10min.

In January, on the first day of the month, sunrise is at 8:14 am and sunset at 5:00 pm. On the last day of the month, in Westport, sunrise is at 7:56 am and sunset at 5:38 pm CST.

January has the least sunshine of the year in Westport, with an average of 3.9h of sunshine.

The average sunshine duration in January is 3.9h.

January, February and November, with an average maximum UV index of 1, are months with the lowest UV index in Westport, South Dakota.

In January, the average daily maximum UV index in Westport is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

25°F

20.7°F

23.7°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.2mph

10.1mph

10mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

18.9

17.2

16.3

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Westport, SD

Average high temperature in January: 20.7°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (20.7°F).

Average low temperature in January: 6.3°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).

Average pressure in January
Westport, SD

Average pressure in January: 30.16"Hg

The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in January
Westport, SD

Average wind speed in January: 9.5mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

Average humidity in January
Westport, SD

Average humidity in January: 88%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (60%).

Average rainfall in January
Westport, SD

Average rainfall in January: 0.59"

The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is January (0.59").

Average rainfall days in January
Westport, SD

Average rainfall days in January: 3 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (2 days).

Average snowfall in January
Westport, SD

Average snowfall in January: 3.82"

The month with the highest snowfall is January (3.82").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in January
Westport, SD

Average snowfall days in January: 13 days

The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in January /
Average sunshine in January
Westport, SD

Average daylight in January: 9h and 12min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

Average sunshine in January: 3h and 54min

The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in January
Westport, SD

Average sunshine days in January: 17.2 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (12.7 days).

Average UV index in January
Westport, SD

Average UV index in January: 1

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).

Average cloud cover in January
Westport, SD

Average cloud cover in January: 57

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 23).

Average visibility in January
Westport, SD

Average visibility in January: 5mi

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).