January weather forecast
Plana, SD

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Weather in January

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

Temperature

Plana's coldest weather arrives in January, when temperatures average a high of 20.7°F (-6.3°C) and a low of 6.3°F (-14.3°C).

Humidity

With an average relative humidity of 88%, January is the most humid month.

Rainfall

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

Snowfall

January through May, October through December are months with snowfall. The month with the most snowfall is January, when snow falls for 13 days and typically aggregates up to 3.82" (97mm) of snow.

Daylight

The average length of the day in January is 9h and 11min.
On the first day of January in Plana, South Dakota, sunrise is at 8:13 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 5:37 pm CST.

Sunshine

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

UV index

The months with the lowest UV index in Plana are January, February and November, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.
Note: An average UV index of 1 in January transforms into this advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. To protect against the Sun's most potent rays, avoid direct exposure around midday. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
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Frequently asked questions

What is the coldest time of year in Plana?

In Plana, January records the average lowest temperatures, peaking at 20.7°F (-6.3°C) and reaching a low of 6.3°F (-14.3°C).

How cold is it in Plana in January?

In January, the average high-temperature and low-temperature are 20.7°F (-6.3°C) and 6.3°F (-14.3°C) respectively.

What is the most humid month in Plana?

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

What is the average humidity in January in Plana?

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

What is the driest month in Plana?

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

How many days does it rain in January in Plana?

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

When does it snow the most in Plana?

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

How many days does it snow in January in Plana?

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

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

The average day length in January in Plana, South Dakota, is 9h and 11min.

When are sunrise and sunset in January in Plana?

In January, on the first day of the month, sunrise is at 8:13 am and sunset at 5:00 pm. On the last day of the month, in Plana, South Dakota, sunrise is at 7:55 am and sunset at 5:37 pm CST.

What is the month with the least sunshine in Plana?

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

How long on average sun shines in January in Plana?

In January, the average sunshine duration is 3.9h.

When is the lowest UV index in Plana?

The months with the lowest UV index are January, February and November, with an average maximum UV index of 1.

What is the UV index intensity in January in Plana?

In Plana, South Dakota, the average daily maximum UV index in January is 1. A UV Index reading of 2, and below, represents a low health risk from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
25°F -3.9°C
20.7°F -6.3°C
23.7°F -4.6°C
Average low temperature
12.7°F -10.7°C
6.3°F -14.3°C
9.1°F -12.7°C
Average pressure
30.13" 765mmHg
30.16" 766mmHg
30.17" 766mmHg
Average wind speed
9.5mph 15.3km/h
9.5mph 15.3km/h
9.4mph 15.1km/h
Average max. wind speed
10.2mph 16.4km/h
10.1mph 16.3km/h
10mph 16.1km/h
Average wind speed gusts
15.7mph 25.3km/h
15.9mph 25.6km/h
15.1mph 24.3km/h
Average humidity
85%
88%
85%
Average rainfall
0.87" 22mm
0.59" 15mm
0.63" 16mm
Average rainfall days
3.1
3
2
Average snowfall
3.43" 87mm
3.82" 97mm
3.7" 94mm
Average snowfall days
11.4
13
10.9
Average daylight
8h 5min
9h 1min
10h 2min
Average sunshine
4h 2min
3h 5min
4h 5min
Average sunshine days
18.9
17.2
16.3
Average UV index
2
1
1
Average cloud cover
54%
57%
55%
Average visibility
6mi 9.7km
5mi 8km
6mi 9.7km

Average temperature in January
Plana, SD

Average temperature in January - Plana, 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).

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Average pressure in January
Plana, SD

Average pressure in January - Plana, 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).

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Average wind speed in January
Plana, SD

Average wind speed in January - Plana, 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).

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Average humidity in January
Plana, SD

Average humidity in January - Plana, 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%).

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Average rainfall in January
Plana, SD

Average rainfall in January - Plana, 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").

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Average rainfall days in January
Plana, SD

Average rainfall days in January - Plana, 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).

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Average snowfall in January
Plana, SD

Average snowfall in January - Plana, 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").

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Average snowfall days in January
Plana, SD

Average snowfall days in January - Plana, 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).

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

Average daylight in January / Average sunshine in January - Plana, SD
  • Average daylight in January: 9h and 1min

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 5min

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).

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Average sunshine days in January
Plana, SD

Average sunshine days in January - Plana, 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).

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Average UV index in January
Plana, SD

Average UV index in January - Plana, 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).

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Average cloud cover in January
Plana, SD

Average cloud cover in January - Plana, 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).

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Average visibility in January
Plana, SD

Average visibility in January - Plana, 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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Plana, South Dakota, USA

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