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Contents
- The climate of Portal
- The best time to visit Portal
- The worst time to visit Portal
- Spring weather in Portal
- Summer weather in Portal
- Autumn weather in Portal
- Winter weather in Portal
- 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 climate of Portal
Identified by the Köppen climate classification as a BSk, Portal, Arizona, experiences a mid-latitude steppe climate. This type of climate, typical of semi-arid regions, is characterized by moderate temperature variations and modest rainfall levels.
Throughout the year, Portal showcases an array of temperatures, from a high of 92.8°F (33.8°C) in June to a low of 36.3°F (2.4°C) in January. A notable aspect of Portal's climate is the temperature swell from March to June where the highs increase from 68.2°F (20.1°C) to 92.8°F (33.8°C). These temperatures show a marked decrease afterward, sinking from 91°F (32.8°C) in July to 54.5°F (12.5°C) in December.
In considering rainfall, Portal enjoys a relatively dry climate with an annual average of less than 1 inch per month. Rainfall levels are at their peak from July to September, with august being the wettest month seeing 1.81" (46mm) of rain. Snowfall is sporadic and mainly confined to January and March, which collectively account for roughly one inch.
Looking at the amount of daylight and sunshine, a noteworthy feature is the steady increase from January peaking in June with 14.2 daylight hours and 11.9 hours of sunshine respectively. A subsequent decrease occurs until December.
Wind speeds in Portal take on an interesting trajectory, increasing from January to April, peaking at 11.1mph (17.9km/h), and diminishing afterward towards the end of the year.
Throughout the year, Portal showcases an array of temperatures, from a high of 92.8°F (33.8°C) in June to a low of 36.3°F (2.4°C) in January. A notable aspect of Portal's climate is the temperature swell from March to June where the highs increase from 68.2°F (20.1°C) to 92.8°F (33.8°C). These temperatures show a marked decrease afterward, sinking from 91°F (32.8°C) in July to 54.5°F (12.5°C) in December.
In considering rainfall, Portal enjoys a relatively dry climate with an annual average of less than 1 inch per month. Rainfall levels are at their peak from July to September, with august being the wettest month seeing 1.81" (46mm) of rain. Snowfall is sporadic and mainly confined to January and March, which collectively account for roughly one inch.
Looking at the amount of daylight and sunshine, a noteworthy feature is the steady increase from January peaking in June with 14.2 daylight hours and 11.9 hours of sunshine respectively. A subsequent decrease occurs until December.
Wind speeds in Portal take on an interesting trajectory, increasing from January to April, peaking at 11.1mph (17.9km/h), and diminishing afterward towards the end of the year.
The best time to visit Portal
Tourists seeking a blend of warmth and sunshine will find May to be the most accommodating with its average high temperature of 82.9°F (28.3°C) and sunshine duration of about 11.7 hours. This is coupled with moderate wind speeds and humidity, as well as relatively low rainfall, making for an ideal setting for outdoor activities.
The worst time to visit Portal
July and August, despite reaching high temperatures, are less desirable for tourism due to the high rainfall levels with 1.81 and 1.46" (37mm) respectively. In addition, the relative humidity also increases significantly, potentially leading to uncomfortable conditions for some visitors.
Spring weather in Portal
Portal's spring weather, extending from March to May, sees an impressive surge of temperatures from 68.2°F (20.1°C) to 82.9°F (28.3°C). The wind speed also increases from 9.8mph (15.8km/h) in March to 11.1mph (17.9km/h) in April, settling back down to 10.7mph (17.2km/h) in May. Spring days in Portal are quite luminous with sunshine duration extending from 9.2 hours in March to 11.7 hours in May.
Summer weather in Portal
Between June and August, temperatures remain steady with highs around 90°F (32.2°C). The climate, however, takes a wet turn with rainfall spiking to 1.81" (46mm) in July and 1.46" (37mm) in August. Despite the rainfall, the duration of daylight and sunshine remains abundant, making it great for sightseeing and outdoor activities.
Autumn weather in Portal
Portal's autumn from September to November, welcomes a slow decline in temperatures, from 84.2°F (29°C) in September to 63.9°F (17.7°C) in November. Rainfall decreases significantly after its summer peak, down to 1.22" (31mm) in September, and continuously dropping to 0.71" (18mm) in November. The amount of daylight and sunshine starts to diminish as winter approaches.
Winter weather in Portal
During the winter months from December to February, Portal experiences considerably lower temperatures, dropping down to 36.3°F (2.4°C). The rainfall is minimal, only slightly increasing to 0.55" (14mm) by February. Snowfall, although not heavy, is observed in January with 0.24" (6mm). The day's length shortens during winter, with daylight ranging from 10.1 hours in December to 11.1 hours in February, and sunshine lingering between 7 to 8.2 hours during this period. The wind speed decreases as well, making for colder, crisp days.
Weather in January
The weather in Portal, Arizona, starts the year off with temperate conditions, moving slowly from the chill of winter. Daylight averages approximately 10.3 hours, gradually increasing as the month progresses. The pressure stabilizes at around 30.11" (765mm), suggesting stable weather patterns. Weather in January »
Weather in February
February in Portal, Arizona, sees a slight increase in temperature, hinting at the approaching Spring. It is, however, still winter, and the weather maintains a balance between the cold of January and the warmth of the following months. Weather in February »
Weather in March
As March arrives in Portal, Arizona, the first hints of Spring begin to show. The weather gradually warms up, making way for delightful temperatures typical of the season. There is a dip in humidity relative to previous months, falling to 29%. Weather in March »
Weather in April
April weather in Portal, Arizona, is typically characterized by an increase in temperature and the unmistakable signs of Spring. Compared to March, there is a significant increase in daylight hours, providing more time to enjoy the weather outdoors. Weather in April »
Weather in May
May is when summer truly begins in Portal, Arizona. Weather during this month is predominantly characterized by warmth and longer hours of daylight. Compared to the breezier conditions of April, the wind speeds start to decrease, rendering an overall calm ambiance. Weather in May »
Weather in June
June in Portal, Arizona, is a month that highlights summer weather at its peak. Temperatures continue to soar, the duration of daylight is at its highest, and cloud cover is minimal, making this month the ultimate personification of summer. Weather in June »
Weather in July
July continues to ride the wave of summer heat in Portal, Arizona, with temperatures remaining high. In addition to the higher temperatures, this month experiences an increased amount of rainfall. Despite being in the summer season, July records the highest rainfall of the year at approximately 1.81" (46mm). Weather in July »
Weather in August
Taking a slight turn from July, August in Portal, Arizona, introduces minor changes. The scorching heat of July begins to subside, but the weather remains firmly within the summer spectrum. Correspondingly, there is a slight drop in daylight hours from July to August although the rate of cloud cover remains constant. Weather in August »
Weather in September
The month of September in Portal, Arizona, indicates the onset of Fall, with declining temperatures being the dominant feature. The transition becomes evident from the lowering temperatures and shorter daylight hours. The rainfall sees a more significant drop from August to September, sliding down to about 1.22" (31mm). Weather in September »
Weather in October
October's weather in Portal, Arizona, gives a clear indication that Fall is in full swing. There is a significant temperature drop, and the summer heat becomes a distant memory. Similarly, the number of daylight hours decreases, and the winds gain speed, reflecting the seasonal change. Weather in October »
Weather in November
As November arrives in Portal, Arizona, the weather takes a noticeable turn towards winter. The brisk air and the noticeable drop in temperature signify the shift in seasons. While rainfall largely remains the same as October, the climatic transition is evident in the gradually shortening daylight hours and the increased relative humidity of about 43%. Weather in November »
Weather in December
December marks the arrival of winter in Portal, Arizona. With a considerable drop in temperature from November, it is the coldest month of the year. Although the number of daylight hours is at the lowest, the amount of sunshine doesn't decrease by as steep a margin, allowing for bright winter days. Weather in December »
Updated: Aug 30, 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
How much does it rain?
Throughout the year, there are 73.4 rainfall days, and 7.91" (201mm) of precipitation is accumulated.
When does it snow?
January through March, November and December are months with snowfall.
How much does it snow?
In Portal, during the entire year, snow falls for 3.5 days and aggregates up to 1.3" (33mm) of snow.
What is the driest month?
April is the month with the least rainfall. Rain falls for 2.8 days and accumulates 0.12" (3mm) of precipitation.
When it does not snow?
April through October are months without snowfall.
What is the least humid month?
The least humid month is May, with an average relative humidity of 21%.
What are the months with the highest UV index?
May through August, with an average maximum UV index of 7, are months with the highest UV index.
What month is the hottest?
In Portal, June is known for its average highest temperatures, reaching a high of 92.8°F (33.8°C) and a low of 70°F (21.1°C).
When are the longest days?
The month with the longest days is June, with an average of 14h and 12min of daylight.
What month has the most sunshine?
With an average of 11.9h of sunshine, June has the most sunshine of the year.
What is the rainiest month?
The month with the most rainfall in Portal is July, when the rain falls for 15 days and typically aggregates up to 1.81" (46mm) of precipitation.
What is the coldest month?
With average temperatures fluctuating between a high of 54.5°F (12.5°C) and a low of 37.6°F (3.1°C), December stands out as the coldest month.
What is the most humid month in Portal?
The most humid month is December, with an average relative humidity of 51%.
When does it snow the most?
The month with the most snowfall is December, when snow falls for 1.5 days and typically aggregates up to 0.79" (20mm) of snow.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 10h and 6min of daylight.
Is there Daylight Saving Time (DST)?
Portal does not utilize Daylight Saving Time (DST). MST timezone is used over the entire year.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 7h of sunshine.
When is the lowest UV index?
December is the month with the lowest UV index, with an average maximum UV index of 2.
Average temperature
Portal, AZ
The warmest month (with the highest average high temperature) is June (92.8°F).
The month with the lowest average high temperature is December (54.5°F).
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (36.3°F).
Average pressure
Portal, AZ
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.03"Hg - Average pressure in March:
29.98"Hg - Average pressure in April:
29.9"Hg - Average pressure in May:
29.87"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:
29.97"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.07"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed
Portal, AZ
- Average wind speed in January:
7.1mph - Average wind speed in February:
8.5mph - Average wind speed in March:
9.8mph - Average wind speed in April:
11.1mph - Average wind speed in May:
10.7mph - Average wind speed in June:
9.6mph
- Average wind speed in July:
8.6mph - Average wind speed in August:
7.4mph - Average wind speed in September:
7.7mph - Average wind speed in October:
8mph - Average wind speed in November:
8mph - Average wind speed in December:
7.4mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is January (7.1mph).
Average humidity
Portal, AZ
The month with the highest relative humidity is December (51%).
The month with the lowest relative humidity is May (21%).
Average rainfall
Portal, AZ
- Average rainfall in January:
0.31" - Average rainfall in February:
0.35" - Average rainfall in March:
0.24" - Average rainfall in April:
0.12" - Average rainfall in May:
0.16" - Average rainfall in June:
0.43"
- Average rainfall in July:
1.81" - Average rainfall in August:
1.46" - Average rainfall in September:
1.22" - Average rainfall in October:
0.55" - Average rainfall in November:
0.71" - Average rainfall in December:
0.55"
The wettest month (with the highest rainfall) is July (1.81").
The driest month (with the least rainfall) is April (0.12").
Average rainfall days
Portal, AZ
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
3.8 days - Average rainfall days in April:
2.8 days - Average rainfall days in May:
2.1 days - Average rainfall days in June:
4.6 days
- Average rainfall days in July:
15 days - Average rainfall days in August:
14.9 days - Average rainfall days in September:
9.5 days - Average rainfall days in October:
4.9 days - Average rainfall days in November:
3.5 days - Average rainfall days in December:
5.2 days
The month with the highest number of rainy days is July (15 days).
The month with the least rainy days is May (2.1 days).
Average snowfall
Portal, AZ
The month with the highest snowfall is December (0.79").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Portal, AZ
- Average snowfall days in January:
1.1 days - Average snowfall days in February:
0.5 days - Average snowfall days in March:
0.2 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 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 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.2 days - Average snowfall days in December:
1.5 days
The month with the highest number of snowfall days is December (1.5 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Portal, AZ
- Average daylight in January:
10h and 2min - Average daylight in February:
11h and 1min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 5min - Average daylight in June:
14h and 1min
- Average daylight in July:
14h and 0min - 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 3min - Average daylight in December:
10h and 1min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in January:
7h and 1min - Average sunshine in February:
8h and 1min - Average sunshine in March:
9h and 1min - Average sunshine in April:
11h and 2min - Average sunshine in May:
11h and 4min - Average sunshine in June:
11h and 5min
- Average sunshine in July:
11h and 4min - Average sunshine in August:
11h and 5min - Average sunshine in September:
10h and 4min - Average sunshine in October:
7h and 2min - Average sunshine in November:
7h and 2min - Average sunshine in December:
7h and 0min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days
Portal, AZ
- Average sunshine days in January:
26.3 days - Average sunshine days in February:
23.9 days - Average sunshine days in March:
26.8 days - Average sunshine days in April:
27.3 days - Average sunshine days in May:
28.5 days - Average sunshine days in June:
22.9 days
- Average sunshine days in July:
9.9 days - Average sunshine days in August:
11.3 days - Average sunshine days in September:
16 days - Average sunshine days in October:
23.7 days - Average sunshine days in November:
25.4 days - Average sunshine days in December:
25.1 days
The month with the most sunshine days is May (28.5 days).
The month with the least sunshine days is July (9.9 days).
Average UV index
Portal, AZ
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover
Portal, AZ
The months with the most cloud cover are July and December (Cloud cover 20).
The month with the least cloud cover is May (Cloud cover 8).
Average visibility
Portal, 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).
Portal, Arizona, USA
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