January weather forecast
Erwin, SD

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Weather in January

January, the same as December, in Erwin, South Dakota, is a freezing cold winter month, with temperature in the range of an average high of 19.4°F (-7°C) and an average low of 5.5°F (-14.7°C).

Temperature

Erwin's January weather, marked by an average high temperature of 19.4°F (-7°C) and an average low temperature of 5.5°F (-14.7°C), is the coldest in the year.

Humidity

January is the most humid month, with an average relative humidity of 90%.

Rainfall

The months with the least rainfall in Erwin are January and February Rain falls for 2.9 days and accumulates 0.59" (15mm) of rain.

Snowfall

Months with snowfall are January through May, October through December. The months with the most snowfall in Erwin, South Dakota, are January and December, with an average 3.74" (95mm) of accumulated snow.

Daylight

In Erwin, the average length of the day in January is 9h and 17min.
On the first day of January in Erwin, South Dakota, sunrise is at 8:06 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 5:36 pm CST.

Sunshine

The month with the least sunshine is January, with an average of 3.6h of sunshine.

UV index

The months with the lowest UV index in Erwin are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: An average maximum UV index of 1 in January leads to these recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Frequently asked questions

What month is the coldest in Erwin?

With average high temperatures of 19.4°F (-7°C) and lows of 5.5°F (-14.7°C), January is the coldest month in Erwin.

How cold is January in Erwin?

The high-temperature during January is 19.4°F (-7°C) and the low-temperature is 5.5°F (-14.7°C).

What is the most humid month in Erwin?

With an average relative humidity of 90%, January is the most humid month in Erwin.

What is the average humidity in January in Erwin?

The average relative humidity in January in Erwin, South Dakota, is 90%.

What is the driest month in Erwin?

The months with the least rainfall in Erwin are January and February Rain falls for 2.9 days and accumulates 0.59" (15mm) of rain.

How much does it rain in Erwin in January?

In Erwin, South Dakota, in January, it is raining for 2.9 days, with typically 0.59" (15mm) of accumulated precipitation.

What is the snowiest month in Erwin?

The months with the most snowfall in Erwin, South Dakota, are January and December, with an average 3.74" (95mm) of accumulated snow.

How much does it snow in Erwin in January?

In Erwin, in January, snow falls for 14.4 days, with typically accumulated 3.74" (95mm) of snow.

What is the average length of the day in January in Erwin?

In Erwin, South Dakota, the average day length in January is 9h and 17min.

When are sunrise and sunset in January in Erwin?

In January, on the first day of the month, sunrise is at 8:06 am and sunset at 5:00 pm. On the last day of the month, in Erwin, South Dakota, sunrise is at 7:49 am and sunset at 5:36 pm CST.

What is the month with the least sunshine in Erwin?

With an average of 3.6h of sunshine, January has the least sunshine of the year.

How many hours of sunshine does Erwin have in January?

In Erwin, South Dakota, the average sunshine duration in January is 3.6h.

What is the month with the lowest UV index in Erwin?

The months with the lowest UV index in Erwin, South Dakota, are January and December, with an average maximum UV index of 1.

What is the UV index intensity in January in Erwin?

The average daily maximum UV index in January is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
23.7°F -4.6°C
19.4°F -7°C
22.5°F -5.3°C
Average low temperature
12.4°F -10.9°C
5.5°F -14.7°C
8.4°F -13.1°C
Average pressure
30.13" 765mmHg
30.16" 766mmHg
30.16" 766mmHg
Average wind speed
11mph 17.7km/h
11mph 17.7km/h
10.8mph 17.4km/h
Average max. wind speed
11.7mph 18.8km/h
11.6mph 18.7km/h
11.4mph 18.3km/h
Average wind speed gusts
18.2mph 29.3km/h
18.6mph 29.9km/h
17.6mph 28.3km/h
Average humidity
87%
90%
87%
Average rainfall
0.75" 19mm
0.59" 15mm
0.59" 15mm
Average rainfall days
3.5
2.9
2.7
Average snowfall
3.74" 95mm
3.74" 95mm
3.35" 85mm
Average snowfall days
13
14.4
11.8
Average daylight
8h 5min
9h 2min
10h 3min
Average sunshine
4h 0min
3h 4min
4h 2min
Average sunshine days
16.3
15.1
15.3
Average UV index
1
1
2
Average cloud cover
59%
63%
60%
Average visibility
6mi 9.7km
5mi 8km
6mi 9.7km

Average temperature in January
Erwin, SD

Average temperature in January - Erwin, SD
  • Average high temperature in January: 19.4°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (19.4°F).

  • Average low temperature in January: 5.5°F

The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (5.5°F).

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Average pressure in January
Erwin, SD

Average pressure in January - Erwin, 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).

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Average wind speed in January
Erwin, SD

Average wind speed in January - Erwin, SD
  • Average wind speed in January: 11mph

The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).

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Average humidity in January
Erwin, SD

Average humidity in January - Erwin, SD
  • Average humidity in January: 90%

The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are September and October (68%).

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Average rainfall in January
Erwin, SD

Average rainfall in January - Erwin, SD
  • Average rainfall in January: 0.59"

The wettest month (with the highest rainfall) is June (3.19").
The driest months (with the least rainfall) are January and February (0.59").

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Average rainfall days in January
Erwin, SD

Average rainfall days in January - Erwin, SD
  • Average rainfall days in January: 2.9 days

The month with the highest number of rainy days is June (17.2 days).
The month with the least rainy days is February (2.7 days).

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Average snowfall in January
Erwin, SD

Average snowfall in January - Erwin, SD
  • Average snowfall in January: 3.74"

The months with the highest snowfall are January and December (3.74").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Erwin, SD

Average snowfall days in January - Erwin, SD
  • Average snowfall days in January: 14.4 days

The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in January / Average sunshine in January - Erwin, SD
  • Average daylight in January: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in January: 3h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

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Average sunshine days in January
Erwin, SD

Average sunshine days in January - Erwin, SD
  • Average sunshine days in January: 15.1 days

The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is June (10.3 days).

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Average UV index in January
Erwin, SD

Average UV index in January - Erwin, SD
  • Average UV index in January: 1

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

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Average cloud cover in January
Erwin, SD

Average cloud cover in January - Erwin, SD
  • Average cloud cover in January: 63

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in January
Erwin, SD

Average visibility in January - Erwin, 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).

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Erwin, South Dakota, USA

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