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Contents
- The climate of Pomona
- The best time to visit Pomona
- The worst time to visit Pomona
- Spring weather in Pomona
- Summer weather in Pomona
- Autumn weather in Pomona
- Winter weather in Pomona
- 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 days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Trails in the rural mountainous region of Pomona, California, with scenic slopes and dense population down below
The climate of Pomona
Pomona, located in California, USA, experiences a type of Mediterranean weather, categorized as warm summer according to the Köppen climate classification (Csb). This classification suggests mild, sometimes moderately wet winters and dry summers with the hottest month temperature below 71.6°F (22°C). The annual temperature varies considerably, with the highest average temperature in Pomona reaching 90.1°F (32.3°C) in August and the lowest average diving to 46.8°F (8.2°C) in January and February.
Rainfall in Pomona exhibits a typical Mediterranean pattern with a substantial difference between the dry and wet seasons. Rain seems almost non-existent from June to September with the average going as low as 0.04" (1mm). The wet season commences in October, with December marking the peak at 1.65" (42mm). The humidity follows a fairly steady scheme, wavering between 45 to 56%. Relative humidity is slightly higher during the slightly cooler months of February, March, April, May and June.
Residents experience significant sunlight hours throughout the year. The shortest days in December still offer nearly 10 hours of daylight, while the longest day in June gives a generous 14 hours and 24 minutes of light. Even the cloudiest months show modest cloud coverage of 21% only. Wind speed remains fairly constant all year round, ranging from 4.4mph (7.1km/h) to 5.7mph (9.2km/h).
Rainfall in Pomona exhibits a typical Mediterranean pattern with a substantial difference between the dry and wet seasons. Rain seems almost non-existent from June to September with the average going as low as 0.04" (1mm). The wet season commences in October, with December marking the peak at 1.65" (42mm). The humidity follows a fairly steady scheme, wavering between 45 to 56%. Relative humidity is slightly higher during the slightly cooler months of February, March, April, May and June.
Residents experience significant sunlight hours throughout the year. The shortest days in December still offer nearly 10 hours of daylight, while the longest day in June gives a generous 14 hours and 24 minutes of light. Even the cloudiest months show modest cloud coverage of 21% only. Wind speed remains fairly constant all year round, ranging from 4.4mph (7.1km/h) to 5.7mph (9.2km/h).
The best time to visit Pomona
The optimal timing for a visit to Pomona largely depends on the visitor's weather preferences. However, considering the temperatures, amount of rainfall, and daylight hours, the period from March to June holds much appeal. The temperatures during these months generally hover between 48°F (8.9°C) to 76.3°F (24.6°C), suitable for a variety of outdoor activities. The rainfall is visibly lower at 0.63" (16mm) to 0.24" (6mm), paving the way for sunnier days. Complete with an average daylight duration extending from 12 to 14.4 hours, this period offers excellent conditions to explore the bounties of Pomona.
The worst time to visit Pomona
The least favorable time to visit Pomona would be in the heart of winter, specifically December and January. The weather during these months can present several constraints for outdoor activities. Temperatures dropping to around 46.8°F (8.2°C), coupled with the highest average monthly rainfall of 1.65" (42mm), may make adventuring less pleasant.
Spring weather in Pomona
Spring in Pomona witnesses a gradual rise in temperature. From March to May, the temperature varies from 48°F (8.9°C) to 54°F (12.2°C) at the lower end and from 65.3°F (18.5°C) to 76.3°F (24.6°C) at the higher end. The humidity stays relatively constant throughout the season, oscillating between 53 and 56%. Rainfall sees a declining trend, with March seeing 0.87" (22mm), which decreases to 0.24" (6mm) by May. Additionally, daylight hours increase steadily from 12 hours in March to nearly 14 hours in May.
Summer weather in Pomona
Summer brings exceptionally dry and hot conditions to Pomona. Between June and August, the lowest temperature stands at 58.5°F (14.7°C) and the highest average summits at 90.1°F (32.3°C). Rainfall is extremely limited, staying as low as 0.04" (1mm) in June and August. The humidity, though, remains average at 54% in June, dropping to 45% by August. The city basks in abundant sunlight with daylight hours reaching up to 14.2 hours and the UV index peaks at 7 in August.
Autumn weather in Pomona
Autumn in Pomona displays milder temperatures, with the lowest sinking to 58.6°F (14.8°C) in October and 52.3°F (11.3°C) in November. The highest falls to 79.5°F (26.4°C) in October and further to 71.4°F (21.9°C) in November. Rain starts picking up, with 0.2" (5mm) in October which jumps to 0.79" (20mm) in November. The city sees a drop in daylight hours, with 11.3 hours at the start of the season and 10.4 hours towards the end.
Winter weather in Pomona
Pomona's winter weather, inherent to its Mediterranean climate, brings cooler temperatures and increased rain. The average low plunges to 46.8°F (8.2°C) in both December and January while the high lowers to 63.1°F (17.3°C) in December. Rainfall touches its yearly high, with 1.65" (42mm) in both December and January. Despite the chill, Pomona sees an average of 9.9 hours of daylight in December.
Weather in January
Janauary sees a subtle jump in relative humidity, making the air feel more rich and comforting to those used to coastal climates. The winter season is in full swing with lower temperatures giving way to comfortable, cool days and slightly chilly evenings. Weather in January »
Weather in February
The weather in Pomona transforms gracefully as it leaves behind the cold shackles of January and transitions into the heart of winter. The month measures higher rainfall making it the optimal time for indoor activities or seekers of romance under the rain. Weather in February »
Weather in March
With the arrival of March, Pomona initiates a warm welcome to Spring. The weather slowly shifts towards more pleasant and warmer days while maintaining mild, comfortable nights for residents. The higher temperature is complemented by comparatively lower rainfall, giving way to more opportunities for outdoor activities. Weather in March »
Weather in April
April brings with it the charm of Spring and the anticipation of Summer. As Pomona inches towards the warmer months, the weather fluctuates between mild and warm. The moderate temperatures make for excellent outdoor weather, particularly during the extended daylight hours. Weather in April »
Weather in May
As the seasons turn, May brings a marked increase in Pomona's temperatures creating a transition from spring to anticipated summer. More daylight hours ensure a bright, sunlit city that welcomes outdoor enthusiasts. The warmer temperatures prompt many to take refuge in the coolness of Pomona's gardens and parks. Weather in May »
Weather in June
June marks the official start of Summer for Pomona. The city basks under the brightest month of the year. With 14.4 hours of daylight, prolonged outdoor activities become a prominent feature of Pomona's daily life. Changes in wind patterns, lesser cloud cover, and a steady increase in temperature all hint towards the summer season taking center stage. Weather in June »
Weather in July
In July, Pomona graces itself with the highest temperatures of the year at an average of 88.5°F (31.4°C). The peak summer month elevates the holiday mood fostering a lively outdoor scene. Families and tourists flock to Pomona's leisure hotspots to make the most of the swell in temperature. Weather in July »
Weather in August
August largely mirrors its predecessor's weather conditions but witnesses a marginal increase in temperature challenging July's reign as the hottest month of the year. Summer continues unabated, with locals and tourists alike basking in the area's lovely outdoor atmosphere. Weather in August »
Weather in September
With the advent of September, Pomona begins its gradual departure from the grips of summer. Temperatures experience a slight dip making cool breezes a common part of the daily weather. Outdoor activities under the diminishing daylight hours become more comfortable thanks to the step down from the blistering summer heat. Weather in September »
Weather in October
October's arrival prompts Pomona to brace itself for the onset of fall. The shift in weather parameters is more pronounced as temperatures continue to lower, creating a soothing contrast to the hot summer months. The change in wind patterns and pressure data indicate the steadily progressing seasonal change. Weather in October »
Weather in November
As the final leaves fall, November transitions Pomona into the winter season. The step down of temperatures, shortening daylight, and late-night chills contribute to the early onset of winter. The cooler temperatures create a cozy atmosphere making November the perfect month to visit for those seeking to escape overly hot climates. Weather in November »
Weather in December
December in Pomona marks the height of the winter season. The dramatic drop in temperature from the fall season is a clear indicator that winter has taken hold. With the decrease of sunshine duration, cloudier days become more prevalent giving the city a touch of grey. 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
How much does it rain in Pomona?
Throughout the year, in Pomona, California, there are 48 rainfall days, and 7.52" (191mm) of precipitation is accumulated.
When it does not snow in Pomona?
January, March through December are months without snowfall.
How many days does it snow in Pomona?
In Pomona, during the entire year, snow falls for 0.1 days.
When is the lowest UV index in Pomona?
The months with the lowest UV index in Pomona, California, are January, February, November and December, with an average maximum UV index of 4.
What is the rainiest month in Pomona?
The wettest months in Pomona, California, are February and December, with an average 1.65" (42mm) of rainfall.
When does it snow in Pomona?
February is the only month when snow falls.
What is the snowiest month in Pomona?
The month with the most snowfall days in Pomona is February, when snow falls for 0.1 days.
What is the month with the least sunshine in Pomona?
February and December, with an average of 6.9h of sunshine, are months with the least sunshine in Pomona, California.
When is Daylight Saving Time (DST) in Pomona?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Pomona, California, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
What is the most humid month in Pomona?
With an average relative humidity of 56%, May is the most humid month in Pomona, California.
What is the driest month in Pomona?
June and August are months with the least rain when the rain falls for 0.8 days and typically aggregates up to 0.04" (1mm) of rain.
When are the longest days in Pomona?
June has the longest days of the year in Pomona, with an average of 14h and 24min of daylight.
What month has the most sunshine in Pomona?
With an average of 12.2h of sunshine, July has the most sunshine of the year.
What part of the year is the hottest in Pomona?
August is Pomona's warmest month, registering average high temperatures of 90.1°F (32.3°C) and lows of 65.7°F (18.7°C).
What are the least humid months in Pomona?
August and November, with an average relative humidity of 45%, are the least humid months in Pomona, California.
When is the highest UV index in Pomona?
The month with the highest UV index in Pomona is August, with an average maximum UV index of 7.
What month is the coldest in Pomona?
With average temperatures fluctuating between a high of 63.1°F (17.3°C) and a low of 46.8°F (8.2°C), December stands out as the coldest month in Pomona, California.
What is the month with the shortest days in Pomona?
December has the shortest days of the year, with an average of 9h and 54min of daylight.
Average temperature
Pomona, CA
The warmest month (with the highest average high temperature) is August (90.1°F).
The month with the lowest average high temperature is December (63.1°F).
The month with the highest average low temperature is August (65.7°F).
The coldest months (with the lowest average low temperature) are February and December (46.8°F).
Average pressure
Pomona, CA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.9"Hg - Average pressure in August:
29.88"Hg - Average pressure in September:
29.88"Hg - Average pressure in October:
29.94"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
Pomona, CA
- Average wind speed in January:
5.2mph - Average wind speed in February:
4.9mph - Average wind speed in March:
5mph - Average wind speed in April:
5.7mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.3mph
- Average wind speed in July:
5mph - Average wind speed in August:
4.7mph - Average wind speed in September:
4.4mph - Average wind speed in October:
4.6mph - Average wind speed in November:
4.8mph - Average wind speed in December:
5mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity
Pomona, CA
The month with the highest relative humidity is May (56%).
The months with the lowest relative humidity are August and November (45%).
Average rainfall
Pomona, CA
- Average rainfall in January:
1.22" - Average rainfall in February:
1.65" - Average rainfall in March:
0.87" - Average rainfall in April:
0.63" - Average rainfall in May:
0.24" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.2" - Average rainfall in November:
0.79" - Average rainfall in December:
1.65"
The wettest months (with the highest rainfall) are February and December (1.65").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days
Pomona, CA
- Average rainfall days in January:
5.3 days - Average rainfall days in February:
5.9 days - Average rainfall days in March:
7.6 days - Average rainfall days in April:
5.6 days - Average rainfall days in May:
3.6 days - Average rainfall days in June:
0.8 days
- Average rainfall days in July:
2.6 days - Average rainfall days in August:
1.6 days - Average rainfall days in September:
2.5 days - Average rainfall days in October:
2.8 days - Average rainfall days in November:
3.9 days - Average rainfall days in December:
5.8 days
The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (0.8 days).
Average snowfall days
Pomona, CA
- Average snowfall days in January:
0 days - Average snowfall days in February:
0.1 days - Average snowfall days in March:
0 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 days - Average snowfall days in December:
0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight / Average sunshine
Pomona, CA
- Average daylight in January:
10h and 1min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
13h and 5min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 1min - 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 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
7h and 0min - Average sunshine in February:
6h and 5min - Average sunshine in March:
9h and 0min - Average sunshine in April:
11h and 2min - Average sunshine in May:
11h and 4min - Average sunshine in June:
12h and 0min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 5min - Average sunshine in October:
8h and 5min - Average sunshine in November:
7h and 2min - Average sunshine in December:
6h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The months with the least sunshine are February and December (Average sunshine: 6h and 54min).
Average sunshine days
Pomona, CA
- Average sunshine days in January:
24.7 days - Average sunshine days in February:
21.1 days - Average sunshine days in March:
23 days - Average sunshine days in April:
23.4 days - Average sunshine days in May:
26 days - Average sunshine days in June:
28.7 days
- Average sunshine days in July:
26.7 days - Average sunshine days in August:
28.3 days - Average sunshine days in September:
26.5 days - Average sunshine days in October:
26.5 days - Average sunshine days in November:
25.2 days - Average sunshine days in December:
23.7 days
The month with the most sunshine days is June (28.7 days).
The month with the least sunshine days is February (21.1 days).
Average UV index
Pomona, CA
The month with the highest UV index is August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover
Pomona, CA
The months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility
Pomona, CA
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).
Pomona, California, USA
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