Pomona weather by month

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Pomona, California, nestled in the Inland Empire, boasts a Mediterranean climate characterized by warm, dry summers and mild, wetter winters. This makes it a desirable location for outdoor activities year-round. However, the nuances of Pomona weather do shift throughout the year. This guide provides a detailed look at Pomona’s weather by month, helping you plan your visit or simply prepare for the seasons.

What to Expect From Pomona’s Climate

Before diving into the specifics, it’s helpful to understand the general patterns. Pomona benefits from a rain shadow effect created by the surrounding mountains, contributing to its predominantly sunny disposition. Temperatures are generally warmer than coastal areas of Southern California, and experience noticeable swings between daytime highs and nighttime lows, particularly in the desert months. Humidity tends to be low, even during the warmer periods, making the heat more bearable. The Santa Ana winds, hot and dry winds originating from the desert, can occasionally impact the area, bringing elevated fire danger and temperatures.

Pomona Weather by Month: A Detailed Breakdown

Here’s a monthly overview of Pomona’s weather, providing average high and low temperatures, rainfall, and typical conditions.

Month Avg High (°F) Avg Low (°F) Rainfall (inches) Typical Conditions
January 63 42 2.2 Coolest month, occasional rain, comfortable days
February 66 44 2.0 Similar to January, slightly warmer
March 70 47 1.6 Mild temperatures, wildflowers begin to bloom
April 75 50 0.7 Pleasant weather, ideal for outdoor events
May 80 55 0.5 Warm and sunny, minimal rainfall
June 85 60 0.2 Hot and dry, perfect for summer activities
July 90 64 0.1 Hottest month, consistently sunny and dry
August 91 65 0.1 Similar to July, very hot
September 87 63 0.4 Warm days, cooler evenings, potential Santa Ana Winds
October 80 56 0.9 Pleasant temperatures, occasional light showers
November 72 48 1.3 Mild and comfortable, increasing rainfall
December 64 43 1.8 Cool temperatures, more frequent rain showers

Note: These are averages, and actual weather conditions may vary.

Spring in Pomona (March – May)

Spring is arguably one of the best times to visit Pomona. Temperatures gradually increase from the 70s to the low 80s, and the landscape bursts into color with blooming wildflowers. Rainfall is minimal, making it ideal for exploring the outdoors, attending local festivals, and enjoying the revitalizing weather. Expect light jackets in the mornings and evenings.

Summer in Pomona (June – August)

Pomona summers are hot and dry, with average highs reaching the low 90s. While the heat can be intense, the low humidity makes it relatively comfortable, especially with proper hydration. This is a prime time for enjoying swimming pools, outdoor concerts, and visiting local attractions. Evening temperatures remain warm, making for pleasant outdoor dining.

Fall in Pomona (September – November)

Fall brings a welcome relief from the summer heat. Temperatures gradually cool down, settling into the 70s and 80s in September and October, then the 60s and 70s in November. While rainfall remains relatively low, it begins to increase as the season progresses. September can sometimes experience Santa Ana winds, bringing warmer temperatures and dry conditions. Fall is a beautiful time to explore the local vineyards and enjoy harvest festivals.

Winter in Pomona (December – February)

Winters in Pomona are mild compared to many other parts of the country. Average highs are in the 60s, and lows rarely dip below 40. Rainfall is most frequent during these months, but typically comes in short, moderate showers. While snow is extremely rare in Pomona itself, the surrounding mountains can receive snowfall, offering opportunities for winter sports.

Frequently Asked Questions (FAQ)

Q: Does it ever snow in Pomona?
A: Very rarely. Snowfall is extremely uncommon in the city itself, but the nearby mountains may get snow.

Q: What is the hottest month in Pomona?
A: August is typically the hottest month with an average high of 91°F.

Q: What is the best time of year to visit Pomona for outdoor activities?
A: Spring (March-May) and Fall (September-November) offer the most pleasant weather for hiking, biking, and other outdoor pursuits.

Q: Are Santa Ana winds common in Pomona?
A: Yes, particularly in the fall. They can bring warm, dry conditions and elevate fire risk.

Q: What kind of clothing should I pack for a trip to Pomona?
A: Layers are key! Pack light clothing for warm days, a jacket or sweater for cooler evenings, and an umbrella or raincoat during the winter months.

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