January weather forecast and climate
Flagstaff, AZ

The brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
The brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street

Weather in January

January, the same as December, is another cold winter month in Flagstaff, Arizona, with average temperature fluctuating between 25.2°F (-3.8°C) and 42.6°F (5.9°C).

Temperature

January and December, with an average high-temperature of 42.6°F (5.9°C), are the coldest months.

Humidity

With an average relative humidity of 66%, January is the most humid month.

Rainfall

In January, the rain falls for 3.4 days. Throughout January, 0.79" (20mm) of precipitation is accumulated. In Flagstaff, during the entire year, the rain falls for 74.8 days and collects up to 12.56" (319mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Flagstaff. In January, it is snowing for 6.1 days. Throughout January, 4.65" (118mm) of snow is accumulated. Throughout the year, in Flagstaff, there are 30.6 snowfall days, and 28.66" (728mm) of snow is accumulated.

Daylight

In January, the average length of the day in Flagstaff is 10.1h.

Sunshine

In Flagstaff, the average sunshine in January is 6.9h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Flagstaff. A UV Index of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 2 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from 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 coldest month in Flagstaff?

The coldest months in Flagstaff are January and December, with an average high-temperature of 42.6°F (5.9°C).

What is the temperature in January in Flagstaff?

In Flagstaff, Arizona, in January, the average high-temperature is 42.6°F (5.9°C), and the average low-temperature is 25.2°F (-3.8°C).

What is the most humid month in Flagstaff?

With an average relative humidity of 66%, January is the most humid month.

What is the average humidity in January in Flagstaff?

In Flagstaff, the average relative humidity in January is 66%.

How many days does it rain in January in Flagstaff?

In January, in Flagstaff, the rain falls for 3.4 days. Throughout January, 0.79" (20mm) of precipitation is accumulated.

How much does it snow in Flagstaff in January?

In Flagstaff, during January, snow falls for 6.1 days and regularly aggregates up to 4.65" (118mm) of snow.

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

In January, the average length of the day in Flagstaff, Arizona, is 10.1h.

How long on average sun shines in January in Flagstaff?

In January, the average sunshine in Flagstaff, Arizona, is 6.9h.

What are the months with the lowest UV index in Flagstaff?

Months with the lowest UV index in Flagstaff are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in January in Flagstaff?

In January, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in January
Flagstaff, AZ

Average temperature in January - Flagstaff, AZ
  • Average high temperature in January: 42.6°F

The warmest month (with the highest average high temperature) is July (82.8°F).
Months with the lowest average high temperature are January and December (42.6°F).

  • Average low temperature in January: 25.2°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).

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Average pressure in January
Flagstaff, AZ

Average pressure in January - Flagstaff, AZ
  • Average pressure in January: 30.14"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in January
Flagstaff, AZ

Average wind speed in January - Flagstaff, AZ
  • Average wind speed in January: 6.5mph

The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

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Average humidity in January
Flagstaff, AZ

Average humidity in January - Flagstaff, AZ
  • Average humidity in January: 66%

The month with the highest relative humidity is January (66%).
The month with the lowest relative humidity is June (24%).

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Average rainfall in January
Flagstaff, AZ

Average rainfall in January - Flagstaff, AZ
  • Average rainfall in January: 0.79"

The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is June (0.24").

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Average rainfall days in January
Flagstaff, AZ

Average rainfall days in January - Flagstaff, AZ
  • Average rainfall days in January: 3.4 days

The month with the highest number of rainy days is July (16.2 days).
Months with the least rainy days are February and November (2.5 days).

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Average snowfall in January
Flagstaff, AZ

Average snowfall in January - Flagstaff, AZ
  • Average snowfall in January: 4.65"

The month with the highest snowfall is December (7.36").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Flagstaff, AZ

Average snowfall days in January - Flagstaff, AZ
  • Average snowfall days in January: 6.1 days

The month with the highest number of snowfall days is December (7.4 days).
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
Flagstaff, AZ

Average daylight in January / Average sunshine in January - Flagstaff, AZ
  • Average daylight in January: 10.1h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in January: 6.9h

Months with the most sunshine are June and August (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in January
Flagstaff, AZ

Average sunshine days in January - Flagstaff, AZ
  • Average sunshine days in January: 23.4 days

The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is July (11.4 days).

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Average UV index in January
Flagstaff, AZ

Average UV index in January - Flagstaff, AZ
  • Average UV index in January: 2

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Flagstaff, AZ

Average cloud cover in January - Flagstaff, AZ
  • Average cloud cover in January: 23

The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 7).

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Average visibility in January
Flagstaff, AZ

Average visibility in January - Flagstaff, AZ
  • Average visibility in January: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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