Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
The coldest period is January, when temperatures fluctuate between an average high of 24.4°F (-4.2°C) and a low of 10.2°F (-12.1°C).Humidity
January is the most humid month, with an average relative humidity of 87%.Rainfall
In Letcher, during January, the rain falls for 2.6 days and regularly aggregates up to 0.31" (8mm) of precipitation. Throughout the year, there are 93.2 rainfall days, and 11.3" (287mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In January, it is snowing for 8.7 days. Throughout January, 1.38" (35mm) of snow is accumulated. In Letcher, during the entire year, snow falls for 35.3 days and aggregates up to 7.17" (182mm) of snow.Daylight
The average length of the day in January is 9h and 21min.On the first day of the month, sunrise is at 8:06 am and sunset at 5:05 pm. On the last day of January, in Letcher, sunrise is at 7:50 am and sunset at 5:41 pm CST.
Sunshine
January has the least sunshine of the year, with an average of 4.4h of sunshine.UV index
The month with the lowest UV index is January, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 1 during January translates into the following directions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold is it in January?
What is the most humid month?
What is the average humidity in January?
How much does it rain in January?
How much does it snow in January?
What is the average length of the day in January?
When are sunrise and sunset in January in Letcher?
What is the month with the least sunshine in Letcher?
How many hours of sunshine does Letcher have in January?
What is the month with the lowest UV index?
How high is the UV index in January?
Average temperature in January
Letcher, SD
- Average high temperature in January: 24.4°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (24.4°F).
- Average low temperature in January: 10.2°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (10.2°F).
Average pressure in January
Letcher, SD
- Average pressure in January: 30.16"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in January
Letcher, SD
- Average wind speed in January: 10.3mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).
Average humidity in January
Letcher, SD
- Average humidity in January: 87%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are September and October (63%).
Average rainfall in January
Letcher, SD
- Average rainfall in January: 0.31"
The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are February and November (0.28").
Average rainfall days in January
Letcher, SD
- Average rainfall days in January: 2.6 days
The month with the highest number of rainy days is June (13.6 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in January
Letcher, SD
- Average snowfall in January: 1.38"
The month with the highest snowfall is February (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Letcher, SD
- Average snowfall days in January: 8.7 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Letcher, SD
- Average daylight in January: 9h and 2min
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 January: 4h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in January
Letcher, SD
- Average sunshine days in January: 21.6 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (12.8 days).
Average UV index in January
Letcher, SD
- Average UV index in January: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in January
Letcher, SD
- Average cloud cover in January: 52
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 22).
Average visibility in January
Letcher, SD
- Average visibility in January: 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).
Letcher, South Dakota, USA
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