January weather forecast
Flagstaff, AZ

Share
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

In Flagstaff, January is marked by winter conditions with the lowest temperatures of the year. The city experiences an average high of just 42.6°F (5.9°C) and a chilling average low of 25.2°F (-3.8°C). Snowfall is prevalent, leading to picturesque landscapes and drawing winter sports enthusiasts. Despite the chilly temperatures, January sees relatively less cloud cover, thereby prolonging sunny hours. The UV index remains fairly low enabling sights and outdoor activities without excessive exposure to harmful rays.

Temperature

The lowest level of Flagstaff's temperatures is noted during January and December, averaging a high-temperature of 42.6°F (5.9°C).

Humidity

The most humid month is January, with an average relative humidity of 66%.

Rainfall

In January, the rain falls for 3.4 days. Throughout January, 0.79" (20mm) of precipitation is accumulated. Throughout the year, in Flagstaff, Arizona, there are 74.8 rainfall days, and 12.56" (319mm) of precipitation is accumulated.

Snowfall

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

Daylight

In January, the average length of the day is 10h and 7min.
On the first day of January, sunrise is at 7:34 am and sunset at 5:25 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 5:53 pm MST.

Sunshine

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

UV index

The months with the lowest UV index in Flagstaff are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In January, an average UV index of 2 transforms into the following instructions:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.

Frequently asked questions

What part of the year is the coldest in Flagstaff?

Flagstaff experiences the lowest of its temperatures in January and December, when the average high-temperatures rise to 42.6°F (5.9°C).

How cold does it get in Flagstaff in January?

During January, Flagstaff experiences an average high-temperature of 42.6°F (5.9°C) and a low-temperature of 25.2°F (-3.8°C).

What is the most humid month in Flagstaff?

January is the most humid month in Flagstaff, Arizona, with an average relative humidity of 66%.

What is the average humidity in January in Flagstaff?

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

How many days does it rain in January in Flagstaff?

In Flagstaff, during January, the rain falls for 3.4 days and regularly aggregates up to 0.79" (20mm) of precipitation.

How many days does it snow in January in Flagstaff?

In January, it is snowing for 6.1 days. Throughout January, 4.65" (118mm) of snow is accumulated.

How many hours of daylight does Flagstaff have in January?

The average day length in January is 10h and 7min.

What time are sunrise and sunset in January in Flagstaff?

On the first day of January in Flagstaff, sunrise is at 7:34 am and sunset at 5:25 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 5:53 pm MST.

How long on average sun shines in January in Flagstaff?

The average sunshine duration in January in Flagstaff, Arizona, is 6.9h.

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

The 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?

The average daily maximum UV index in January in Flagstaff is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).
The 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).

Average pressure in January
Flagstaff, AZ

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

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

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).

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%).

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").

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).
The months with the least rainy days are February and November (2.5 days).

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").
The months with the least snowfall are June, July, August and September (0").

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).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in January /
Average sunshine in January
Flagstaff, AZ

Average daylight in January / Average sunshine in January - Flagstaff, AZ
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in January: 6h and 5min

The months with the most sunshine are June and August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).

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).

Average UV index in January
Flagstaff, AZ

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

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

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).

Average visibility in January
Flagstaff, AZ

Average visibility in January - Flagstaff, AZ
  • 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).

Flagstaff, Arizona, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location