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
During January and December, Sumatra experiences its lowest temperatures, averaging a high-temperature of 30.9°F (-0.6°C).Humidity
With an average relative humidity of 79%, January is the most humid month.Rainfall
January, November and December are months with the least rain when the rain falls for 4.2 days and typically aggregates up to 0.47" (12mm) of rain.Snowfall
Months with snowfall are January through May, September through December. In Sumatra, in January, snow falls for 9.5 days, with typically accumulated 2.52" (64mm) of snow. Throughout the year, there are 47 snowfall days, and 15.83" (402mm) of snow is accumulated.Daylight
The average length of the day in January in Sumatra is 9h and 4min.On the first day of January in Sumatra, sunrise is at 7:54 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:11 pm MST.
Sunshine
In January, the average sunshine is 5.4h.UV index
In Sumatra, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: An average maximum UV index of 2 in January leads to these recommendations:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Sumatra?
How cold is it in Sumatra in January?
What is the most humid month in Sumatra?
What is the average humidity in January in Sumatra?
What is the driest month in Sumatra?
How much does it rain in Sumatra in January?
How much does it snow in Sumatra in January?
What is the average length of the day in January in Sumatra?
What time are sunrise and sunset in January in Sumatra?
How many hours of sunshine does Sumatra have in January?
What is the UV index reading in January in Sumatra?
Average temperature in January
Sumatra, MT
- Average high temperature in January: 30.9°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The months with the lowest average high temperature are January and December (30.9°F).
- Average low temperature in January: 17.4°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in January
Sumatra, MT
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in January
Sumatra, MT
- Average wind speed in January: 9.8mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is July (8.2mph).
Average humidity in January
Sumatra, MT
- Average humidity in January: 79%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).
Average rainfall in January
Sumatra, MT
- Average rainfall in January: 0.47"
The wettest month (with the highest rainfall) is May (1.81").
The driest months (with the least rainfall) are January, November and December (0.47").
Average rainfall days in January
Sumatra, MT
- Average rainfall days in January: 4.2 days
The month with the highest number of rainy days is May (13.7 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in January
Sumatra, MT
- Average snowfall in January: 2.52"
The month with the highest snowfall is February (3.74").
The months with the least snowfall are June, July and August (0").
Average snowfall days in January
Sumatra, MT
- Average snowfall days in January: 9.5 days
The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in January /
Average sunshine in January
Sumatra, MT
- Average daylight in January: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January: 5h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 18min).
Average sunshine days in January
Sumatra, MT
- Average sunshine days in January: 18.5 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is April (14.2 days).
Average UV index in January
Sumatra, MT
- Average UV index in January: 2
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in January
Sumatra, MT
- Average cloud cover in January: 43
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in January
Sumatra, MT
- 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).
Sumatra, Montana, USA
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