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Contents
- The climate of Flagstaff
- The Best Time to Visit Flagstaff
- The Worst Time to Visit Flagstaff
- Spring Weather in Flagstaff
- Summer Weather in Flagstaff
- Autumn Weather in Flagstaff
- Winter Weather in Flagstaff
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
The climate of Flagstaff
Nestled in Arizona, Flagstaff boasts mild and moderate weather with the Köppen climate classification of Csb. This zone is indicative of a Mediterranean climate with enjoyable, warm summers. Straightforward analysis of the weather parameters reveals a finer snapshot of this city's dynamic atmospheric conditions.
Temperature variations are considerable between the coldest month, January, and the warmest month, July. In January, the average high temperature hovers near 42.6°F (5.9°C) with nighttime averages descending to 25.2°F (-3.8°C). In direct contrast, July experiences an average high of 82.8°F (28.2°C) and a nighttime average of 60.4°F (15.8°C).
Humidity ranges between 24% in June, making it the driest month, to 66% in January, making it the most humid month of the year. The city enjoys a fair amount of sunshine averaging from 6.8 hours a day in December to 12.2 hours a day in June. The city sees most of its rain in July, averaging 2.56" (65mm) spread across 16.2 days, while the least rainfall occurs in June with an average of just 0.24" (6mm) over three days.
Flagstaff also exhibits unique weather patterns. Noticeably, a sharp dip in sunshine days is seen during July and August, dropping to 11.4 and 12.3 days respectively, despite longer daylight hours.
Temperature variations are considerable between the coldest month, January, and the warmest month, July. In January, the average high temperature hovers near 42.6°F (5.9°C) with nighttime averages descending to 25.2°F (-3.8°C). In direct contrast, July experiences an average high of 82.8°F (28.2°C) and a nighttime average of 60.4°F (15.8°C).
Humidity ranges between 24% in June, making it the driest month, to 66% in January, making it the most humid month of the year. The city enjoys a fair amount of sunshine averaging from 6.8 hours a day in December to 12.2 hours a day in June. The city sees most of its rain in July, averaging 2.56" (65mm) spread across 16.2 days, while the least rainfall occurs in June with an average of just 0.24" (6mm) over three days.
Flagstaff also exhibits unique weather patterns. Noticeably, a sharp dip in sunshine days is seen during July and August, dropping to 11.4 and 12.3 days respectively, despite longer daylight hours.
The Best Time to Visit Flagstaff
The ideal time to visit Flagstaff is between March and June, as temperature highs range from 53.8°F (12.1°C) to 81.5°F (27.5°C). These months delight visitors with increased daylight hours ranging from 12 to 14.5 hours, and diminished rain days ranging from 5.6 to 3, ensuring more opportunities for outdoor activities.
The Worst Time to Visit Flagstaff
The least favorable time to visit would be between November and February. During this period, average high temperatures range from 42.6°F (5.9°C) to 53.1°F (11.7°C), plummeting as low as 24.8°F (-4°C) at night. The climate becomes more rugged, with increased snowfall accumulated to as high as 7.36" (187mm) in December.
Spring Weather in Flagstaff
Spring blooms in Flagstaff from March to May with average high temperatures steadily ascending from 53.8°F (12.1°C) to 68.9°F (20.5°C). These months come with less precipitation, around 0.55" (14mm) to 0.75" (19mm), usually over 5.6 to 4.8 rain days. Humidity decreases significantly during this season, from 47% in March to 33% in May.
Summer Weather in Flagstaff
Flagstaff's summer period stretches from June to August. The highest temperature recorded in this period is 82.8°F (28.2°C) in July, while nighttime temperatures remain agreeable between 54.1°F (12.3°C) and 60.4°F (15.8°C). Despite the warm temperatures, this season exhibits a sharp increase in rainfall, peaking at 2.56" (65mm) in July over approximately 16 rain days.
Autumn Weather in Flagstaff
Autumn in Flagstaff, running from September to November witnesses cooling temperatures. Average high temperatures shift downwards from 75.2°F (24°C) to 53.1°F (11.7°C), while the nighttime averages fall between 53.8°F (12.1°C) and 32.2°F (0.1°C). Rain days decrease significantly to between 9 and 2.5 days, with rainfall ranging from 0.98" (25mm) to 0.94" (24mm) across these months.
Winter Weather in Flagstaff
December ushers in winter in Flagstaff, which extends up to February. These months are quite cold with average high temperatures fluctuating between 42.6°F (5.9°C) to 53.1°F (11.7°C) and lows reaching down to 24.8°F (-4°C). These months also experience an increase in snowfall, reaching as high as 7.36" (187mm) in December, and consistently recording more than 2" (51mm) throughout this season. The shortened daylight hours, reaching a low of 9.8 hours per day in December, further add to the crisp winter feeling.
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. Weather in January »
Weather in February
February still bears the freshness of winter in Flagstaff, although marginally warmer than January. Noticeably, the average snowfall increases to a significant 5.94" (151mm), making it an ideal time for snow-related activities. Weather in February »
Weather in March
March in Flagstaff witnesses a significant shift in weather patterns. There is an upswing in average high temperature, reaching up to 53.8°F (12.1°C). The snowfall also records a substantial decrease from the previous month. Consequently, March paves the path for an imminent spring, making temperature changes noticeable. Weather in March »
Weather in April
April in Flagstaff is an embodiment of spring, characterized by warmer days and nights. Notably, the average wind speed picks up, reaching 9.6mph (15.4km/h), resulting in a fresher atmosphere. This month also experiences an obvious rise in the UV index, making the sun's rays stronger and more hazardous. Weather in April »
Weather in May
May in Flagstaff is characterized by further precipitation decrease, with an average of just 0.75" (19mm). As temperatures rise, the city enters a phase of dry, warm weather. Coupled with a drop in the relative humidity, this makes for some comfortable evenings and clear skies. Weather in May »
Weather in June
June signals the onset of summer in Flagstaff, with temperatures rising noticeably. The mercury soars to an average high of 81.5°F (27.5°C), marking this month as one of the hottest of the year. At the same time, June records the lowest average rainfall, indicating a dry atmosphere. Weather in June »
Weather in July
July in Flagstaff brings an abrupt change as rainfall jumps to a high 2.56" (65mm), the highest for the year. While temperatures continue to remain high and the sun shines brightly, sudden showers become characteristic of this month. Weather in July »
Weather in August
August introduces a subtle change in weather conditions in Flagstaff. The rainfall decreases slightly from its July peak, marking the end of the heavy rain phase. However, the city still experiences a healthy dose of sunshine, presenting a nice balance of sun and showers. Weather in August »
Weather in September
September ushers in the autumn season in Flagstaff. A prominent feature is the drop in maximum temperature to 75.2°F (24°C), down from the 80s of previous months. Simultaneously, the rainfall also reduces significantly, making the climate relatively drier. Weather in September »
Weather in October
October in Flagstaff is a harbinger of the upcoming winter season. There is a marked drop in temperature, with an average high of 63.5°F (17.5°C). In a surprising turn, snow makes a comeback, albeit just 1.34" (34mm) on average, indicating the start of the snowy season. Weather in October »
Weather in November
November witnesses a cooldown in Flagstaff weather. A significant drop in temperature to an average high of 53.1°F (11.7°C) signals the transition to the winter season. The snowfall increases to 2.6" (66mm), making the city's landscapes wintry. Weather in November »
Weather in December
December brings brilliance to winter in Flagstaff with temperatures dropping to an average low of 24.8°F (-4°C) and snowfall reaching its highest at 7.36" (187mm). Despite the chill, the city exhibits a striking winter appeal, attracting tourists. Weather in December »
Updated: Feb 9, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
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).
What is the most humid month in Flagstaff?
January is the most humid month, with an average relative humidity of 66%.
How many days does it rain in Flagstaff?
In Flagstaff, Arizona, during the entire year, the rain falls for 74.8 days and collects up to 12.56" (319mm) of precipitation.
When does it snow in Flagstaff?
Months with snowfall in Flagstaff are January through May, October through December.
How many days does it snow in Flagstaff?
In Flagstaff, Arizona, during the entire year, snow falls for 30.6 days and aggregates up to 28.66" (728mm) of snow.
What are the months with the lowest UV index in Flagstaff?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the least humid month in Flagstaff?
June is the least humid month in Flagstaff, with an average relative humidity of 24%.
What is the driest month in Flagstaff?
The month with the least rainfall in Flagstaff, Arizona, is June, when the rain falls for 3 days and typically collects 0.24" (6mm) of precipitation.
When it does not snow in Flagstaff?
In Flagstaff, Arizona, snow does not fall in June through September.
When are the longest days in Flagstaff?
The month with the longest days in Flagstaff, Arizona, is June, with an average of 14h and 30min of daylight.
What is the month with the most sunshine in Flagstaff?
The months with the most sunshine are June and August, with an average of 12.2h of sunshine.
What is the month with the highest UV index in Flagstaff?
The months with the highest UV index in Flagstaff are June through August, with an average maximum UV index of 6.
What month is the hottest in Flagstaff?
The warmest temperatures in Flagstaff, Arizona, occur during July, when averages reach a peak of 82.8°F (28.2°C) and a low of 60.4°F (15.8°C).
What is the wettest month in Flagstaff?
The month with the most rainfall is July, when the rain falls for 16.2 days and typically aggregates up to 2.56" (65mm) of precipitation.
When does it snow the most in Flagstaff?
December is the month with the most snowfall. Snow falls for 7.4 days and accumulates 7.36" (187mm) of snow.
What is the month with the shortest days in Flagstaff?
The month with the shortest days is December, with an average of 9h and 48min of daylight.
Is there Daylight Saving Time (DST) in Flagstaff?
Flagstaff does not utilize Daylight Saving Time (DST). MST timezone is used throughout the entire year.
What is the month with the least sunshine in Flagstaff?
The month with the least sunshine in Flagstaff, Arizona, is December, with an average of 6.8h of sunshine.
Average temperature
Flagstaff, AZ
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).
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
Flagstaff, AZ
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
29.99"Hg - Average pressure in April:
29.91"Hg - Average pressure in May:
29.88"Hg - Average pressure in June:
29.86"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.94"Hg - Average pressure in September:
29.94"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.1"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
Flagstaff, AZ
- Average wind speed in January:
6.5mph - Average wind speed in February:
7.6mph - Average wind speed in March:
8.4mph - Average wind speed in April:
9.6mph - Average wind speed in May:
9.4mph - Average wind speed in June:
9mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.5mph - Average wind speed in October:
7.1mph - Average wind speed in November:
7.3mph - Average wind speed in December:
6.9mph
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
Flagstaff, AZ
The month with the highest relative humidity is January (66%).
The month with the lowest relative humidity is June (24%).
Average rainfall
Flagstaff, AZ
- Average rainfall in January:
0.79" - Average rainfall in February:
1.1" - Average rainfall in March:
0.91" - Average rainfall in April:
0.55" - Average rainfall in May:
0.75" - Average rainfall in June:
0.24"
- Average rainfall in July:
2.56" - Average rainfall in August:
1.93" - Average rainfall in September:
0.98" - Average rainfall in October:
0.71" - Average rainfall in November:
0.94" - Average rainfall in December:
1.1"
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
Flagstaff, AZ
- Average rainfall days in January:
3.4 days - Average rainfall days in February:
2.5 days - Average rainfall days in March:
5.3 days - Average rainfall days in April:
5.6 days - Average rainfall days in May:
4.8 days - Average rainfall days in June:
3 days
- Average rainfall days in July:
16.2 days - Average rainfall days in August:
14 days - Average rainfall days in September:
9 days - Average rainfall days in October:
4.9 days - Average rainfall days in November:
2.5 days - Average rainfall days in December:
3.6 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
Flagstaff, AZ
- Average snowfall in January:
4.65" - Average snowfall in February:
5.94" - Average snowfall in March:
4.09" - Average snowfall in April:
2.2" - Average snowfall in May:
0.47" - Average snowfall in June:
0"
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
Flagstaff, AZ
- Average snowfall days in January:
6.1 days - Average snowfall days in February:
6.2 days - Average snowfall days in March:
4.2 days - Average snowfall days in April:
2.4 days - Average snowfall days in May:
0.9 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.1 days - Average snowfall days in October:
0.8 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
7.4 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 / Average sunshine
Flagstaff, AZ
- Average daylight in January:
10h and 1min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 3min
- Average daylight in July:
14h and 2min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
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 - Average sunshine in February:
8h and 4min - Average sunshine in March:
9h and 1min - Average sunshine in April:
10h and 4min - Average sunshine in May:
11h and 4min - Average sunshine in June:
12h and 1min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
12h and 1min - Average sunshine in September:
9h and 4min - Average sunshine in October:
7h and 5min - Average sunshine in November:
7h and 2min - Average sunshine in December:
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
Flagstaff, AZ
- Average sunshine days in January:
23.4 days - Average sunshine days in February:
20.8 days - Average sunshine days in March:
22.9 days - Average sunshine days in April:
22.9 days - Average sunshine days in May:
23.5 days - Average sunshine days in June:
25.8 days
- Average sunshine days in July:
11.4 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
17.8 days - Average sunshine days in October:
24.2 days - Average sunshine days in November:
25.3 days - Average sunshine days in December:
22.4 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
Flagstaff, AZ
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
Flagstaff, AZ
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
Flagstaff, AZ
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
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