Flagstaff
Arizona, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Flagstaff, AZ

A close-up of the brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
A close-up of the brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
January, like December, in Flagstaff, Arizona, is a wintry winter month, with temperature in the range of an average low of 17.2°F (-8.2°C) and an average high of 42.4°F (5.8°C).

Temperature

The coldest months are January and December, with an average high-temperature of 42.4°F (5.8°C).

Humidity

January is the most humid month, with an average relative humidity of 61.9%.

Rainfall

In Flagstaff, Arizona, it is raining for 7.6 days, with typically 2.1" (52.1mm) of accumulated precipitation. In Flagstaff, Arizona, during the entire year, the rain falls for 87.7 days and collects up to 21.9" (555.3mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Flagstaff. The month with the most snowfall in Flagstaff, Arizona, is January when snow falls for 7.5 days and typically aggregates up to 23.2" (589.3mm) of snow.

Daylight

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

Sunshine

The average sunshine in Flagstaff is 7.5h.

UV index

January and December, with an average maximum UV index of 3, are months with the lowest UV index in Flagstaff. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What are the coldest months in Flagstaff?

January and December, with an average high-temperature of 42.4°F (5.8°C), are the coldest months.

What is the temperature in January in Flagstaff?

In Flagstaff, in January, the average high-temperature is 42.4°F (5.8°C), and the average low-temperature is 17.2°F (-8.2°C).

What is the most humid month in Flagstaff?

With an average relative humidity of 61.9%, January is the most humid month in Flagstaff, Arizona.

What is the average humidity in January in Flagstaff?

In Flagstaff, the average relative humidity in January is 61.9%.

How much does it rain in Flagstaff in January?

In Flagstaff, in January, during 7.6 rainfall days, 2.1" (52.1mm) of precipitation is typically accumulated.

How much does it snow in Flagstaff in January?

In Flagstaff, in January, snow falls for 7.5 days, with typically accumulated 23.2" (589.3mm) of snow.

When does it snow the most in Flagstaff?

January is the month with the most snowfall in Flagstaff, Arizona. Snow falls for 7.5 days and accumulates 23.2" (589.3mm) of snow.

How many hours of daylight does Flagstaff have in January?

The average length of the day in January 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 7.5h.

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

Months with the lowest UV index are January and December, with an average maximum UV index of 3.

What is the UV index reading in January in Flagstaff?

The average daily maximum UV index in January is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in January - Flagstaff, AZ
  • Average high temperature in January: 42.5°F

The warmest month (with the highest average high temperature) is July (81.2°F).
Months with the lowest average high temperature are January and December (42.5°F).

  • Average low temperature in January: 17.3°F

The month with the highest average low temperature is July (50.9°F).
The coldest month (with the lowest average low temperature) is December (16.8°F).

Average humidity in January - Flagstaff, AZ
  • Average humidity in January: 61.9%

The month with the highest relative humidity is January (61.9%).
The month with the lowest relative humidity is June (33.6%).

Average rainfall in January - Flagstaff, AZ
  • Average rainfall in January: 2.1"

The wettest month (with the highest rainfall) is August (3.1").
The driest month (with the lowest rainfall) is June (0.4").

Average rainfall days in January - Flagstaff, AZ
  • Average rainfall days in January: 7.6 days

The month with the highest number of rainy days is August (14 days).
The month with the lowest number of rainy days is June (2.6 days).

Average snowfall in January - Flagstaff, AZ
  • Average snowfall in January: 23.2"

The month with the highest snowfall is January (23.2").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in January - Flagstaff, AZ
  • Average snowfall days in January: 7.5 days

The month with the highest number of snowfall days is January (7.5 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

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 shortest days is December (Average daylight: 9.8h).

  • Average sunshine in January: 7.5h

The month with most sunshine is June (Average sunshine: 12.4h).
The month with least sunshine is December (Average sunshine: 7.1h).

Average UV index in January - Flagstaff, AZ
  • Average UV index in January: 3

The month with the highest UV index is July (UV index 12).
Months with the lowest UV index are January and December (UV index 3).