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
With the transition into January, Roy notes an average high-temperature of a still freezing cold 30.6°F (-0.8°C), closely resembling December. January brings with it a nighttime average temperature of 16.9°F (-8.4°C) in Roy.Humidity
In Roy, Montana, the average relative humidity in January is 78%.Rainfall
In Roy, during January, the rain falls for 5.4 days and regularly aggregates up to 0.83" (21mm) of precipitation. Throughout the year, in Roy, there are 126.2 rainfall days, and 17.83" (453mm) of precipitation is accumulated.Snowfall
Months with snowfall in Roy are January through June, September through December. In Roy, Montana, during January, snow falls for 12.9 days and regularly aggregates up to 5.47" (139mm) of snow. Throughout the year, in Roy, there are 83.4 snowfall days, and 45.51" (1156mm) of snow is accumulated.Daylight
The average length of the day in January is 8h and 59min.On the first day of the month, sunrise is at 8:02 am and sunset at 4:35 pm. On the last day of January, in Roy, Montana, sunrise is at 7:42 am and sunset at 5:15 pm MST.
Sunshine
In Roy, the average sunshine in January is 5.7h.UV index
The months with the lowest UV index in Roy are January through April, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A maximum high UV index of 2 in January translates into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Roy in January?
What is the average humidity in January in Roy?
How much does it rain in Roy in January?
How many days does it snow in January in Roy?
How many hours of daylight does Roy have in January?
When are sunrise and sunset in January in Roy?
How long on average sun shines in January in Roy?
What is the month with the lowest UV index in Roy?
What is the UV index reading in January in Roy?
Average temperature in January
Roy, MT
- Average high temperature in January: 30.6°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The months with the lowest average high temperature are February and December (29.1°F).
- Average low temperature in January: 16.9°F
The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).
Average pressure in January
Roy, 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 (29.85"Hg).
Average wind speed in January
Roy, MT
- Average wind speed in January: 9.9mph
The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).
Average humidity in January
Roy, MT
- Average humidity in January: 78%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).
Average rainfall in January
Roy, MT
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days in January
Roy, MT
- Average rainfall days in January: 5.4 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in January
Roy, MT
- Average snowfall in January: 5.47"
The month with the highest snowfall is April (9.13").
The months with the least snowfall are July and August (0").
Average snowfall days in January
Roy, MT
- Average snowfall days in January: 12.9 days
The month with the highest number of snowfall days is February (15.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in January /
Average sunshine in January
Roy, MT
- Average daylight in January: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January: 5h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in January
Roy, MT
- Average sunshine days in January: 15.9 days
The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).
Average UV index in January
Roy, MT
- Average UV index in January: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in January
Roy, MT
- Average cloud cover in January: 39
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in January
Roy, 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).
Roy, Montana, USA
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