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
January
Weather in January
Temperature
In January, Sisters's weather conditions record an average high-temperature of a still cold 39°F (3.9°C), demonstrating little divergence from the preceding month. In Sisters, January is marked by an average low-temperature of 26.6°F (-3°C).Humidity
In January, the average relative humidity is 83%.Rainfall
The month with the most rainfall is January, when the rain falls for 12.8 days and typically aggregates up to 3.31" (84mm) of precipitation.Snowfall
Months with snowfall in Sisters are January through May, September through December. In January, it is snowing for 11.2 days. Throughout January, 12.09" (307mm) of snow is accumulated. Throughout the year, there are 70.7 snowfall days, and 60.04" (1525mm) of snow is accumulated.Daylight
In Sisters, the average length of the day in January is 9h and 19min.On the first day of January, sunrise is at 7:41 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:13 pm PST.
Sunshine
In January, the average sunshine is 5.2h.UV index
In Sisters, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 2 in January translates into the following instructions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in January?
What is the average humidity in January?
What is the wettest month?
How many days does it rain in January?
How much does it snow in January?
What is the average length of the day in January?
What time are sunrise and sunset in January?
How long on average sun shines in January in Sisters?
What is the UV index reading in January?
Average temperature in January
Sisters, OR
- Average high temperature in January: 39°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in January: 26.6°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).
Average pressure in January
Sisters, OR
- Average pressure in January: 30.16"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in January
Sisters, OR
- Average wind speed in January: 5.8mph
The windiest month (with the highest average wind speed) is February (6.1mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).
Average humidity in January
Sisters, OR
- Average humidity in January: 83%
The month with the highest relative humidity is December (84%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in January
Sisters, OR
- Average rainfall in January: 3.31"
The wettest month (with the highest rainfall) is January (3.31").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in January
Sisters, OR
- Average rainfall days in January: 12.8 days
The month with the highest number of rainy days is March (16.9 days).
The month with the least rainy days is July (5 days).
Average snowfall in January
Sisters, OR
- Average snowfall in January: 12.09"
The month with the highest snowfall is February (13.74").
The months with the least snowfall are June, July and August (0").
Average snowfall days in January
Sisters, OR
- Average snowfall days in January: 11.2 days
The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in January /
Average sunshine in January
Sisters, OR
- 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: 5h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in January
Sisters, OR
- Average sunshine days in January: 12.3 days
The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is March (8.1 days).
Average UV index in January
Sisters, OR
- Average UV index in January: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in January
Sisters, OR
- Average cloud cover in January: 49
The months with the most cloud cover are January, February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in January
Sisters, OR
- Average visibility in January: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).