January weather forecast
Sisters, OR

Weather in January

January, the same as December, is another cold winter month in Sisters, Oregon, with an average temperature varying between 39°F (3.9°C) and 26.6°F (-3°C).

Temperature

In Sisters, the average high-temperature in January is almost the same as in December - a still cold 39°F (3.9°C). In January, the average low-temperature is 26.6°F (-3°C).

Humidity

In January, the average relative humidity in Sisters is 83%.

Rainfall

January is the month with the most rainfall. Rain falls for 12.8 days and accumulates 3.31" (84mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Sisters, Oregon, during 11.2 snowfall days, 12.09" (307mm) of snow is typically accumulated. Throughout the year, in Sisters, there are 70.7 snowfall days, and 60.04" (1525mm) of snow is accumulated.

Daylight

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 7:24 am and sunset at 5:14 pm PST.

Sunshine

In Sisters, Oregon, the average sunshine in January is 5.2h.

UV index

In Sisters, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in January in Sisters?

In January, the average relative humidity in Sisters is 83%.

What is the rainiest month in Sisters?

January is the month with the most rainfall in Sisters. Rain falls for 12.8 days and accumulates 3.31" (84mm) of precipitation.

How many days does it rain in January in Sisters?

In Sisters, Oregon, in January, during 12.8 rainfall days, 3.31" (84mm) of precipitation is typically accumulated.

How many days does it snow in January in Sisters?

In January, in Sisters, it is snowing for 11.2 days. Throughout January, 12.09" (307mm) of snow is accumulated.

How many hours of daylight does Sisters have in January?

In January, the average day length in Sisters is 9h and 19min.

When is the sunrise / sunset in January in Sisters?

In January, on the first day of the month, sunrise is at 7:41 am and sunset at 4:37 pm. On the last day of the month, in Sisters, sunrise is at 7:24 am and sunset at 5:14 pm PST.

How long on average sun shines in January in Sisters?

In Sisters, Oregon, the average sunshine duration in January is 5.2h.

What is the UV index intensity in January in Sisters?

In Sisters, Oregon, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Sisters, OR

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).

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Average pressure in January
Sisters, OR

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).

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Average wind speed in January
Sisters, OR

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).

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Average humidity in January
Sisters, OR

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%).

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Average rainfall in January
Sisters, OR

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").

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Average rainfall days in January
Sisters, OR

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).

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Average snowfall in January
Sisters, OR

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").

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Average snowfall days in January
Sisters, OR

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).

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Average daylight in January /
Average sunshine in January
Sisters, OR

Average daylight in January / Average sunshine in January - Sisters, OR
  • Average daylight in January: 9h and 19min

The month with the longest days is June (Average daylight: 15h and 28min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in January: 5h and 12min

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).

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Average sunshine days in January
Sisters, OR

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).

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Average UV index in January
Sisters, OR

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).

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Average cloud cover in January
Sisters, OR

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).

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Average visibility in January
Sisters, OR

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).

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