Climate and monthly weather forecast
Julian, CA


The climate of Julian

Julian, California, USA possesses a Mediterranean, hot summer climate, classified as 'Csa' according to the Köppen climate system. It is nestled within Southern California, an area renowned for its diverse weather conditions; it ranges from coastal to inland, and from valley to mountain weather patterns.

Julian experiences a range of contrasting temperatures between high and low throughout the year, from high temperatures that range from 61.3°F (16.3°C) to a peak of 87.3°F (30.7°C), and low temperatures from the region of 44.2°F (6.8°C) to 64.9°F (18.3°C). Year-round, atmospheric pressure remains fairly stable, varying from 29.85inHg (1010.8mbar) to 30.09inHg (1019mbar). The highest humidity is around the 62% mark with the lowest at 52% accounting for negligible variation.

On a noteworthy note, Julian receives annual snowfall with accumulations ranging from 0" (0mm) in the warm months up to a substantial 6.7" (170mm) in peak cold months. In comparison, rainfall fluctuates between a mere 0.08" (2mm) to a maximum of 0.94" (24mm). The wind exhibits a pattern of slight ups and downs. From the start of the year, it gradually picks up speed reaching 5.7mph (9.2km/h) in May then slowing down to 4.1mph (6.6km/h) in September.

The best time to visit Julian

If clear skies and warm weather are the objective, summer is the optimal choice for a visit to Julian. It's when the temperatures reach their peak, from 81.3°F (27.4°C) in June, gradually escalating to heights of 87.3°F (30.7°C) in August. The skies are usually clear with only 6-9% cloud coverage, and the average daytime UV index hovers between 5 to 6, revealing that one might need sufficient protection against the intense sunlight.

The worst time to visit Julian

The time conjuring the most difficulty for visitors would be the colder months of December through February. Julian tends to sway towards the cooler side, with low average temperatures dipping to around 44.2°F (6.8°C). However, for those tackling the cold, the corresponding charm of this period lies within the 4 to 6.7" (170mm) of snowfall that tends to grace the town.

Spring weather in Julian

Spring in Julian rolls in with a gentle breath of moderate temperatures, averaging from a high of 63.3°F (17.4°C) to 73.6°F (23.1°C), and lows ranging from 44.2°F (6.8°C) up to 51.3°F (10.7°C). The rainfall decreases substantially in April and May to around 0.35 and 0.24" (6mm) respectively. The level of humidity also sees a steady increase from March to May, climbing up by three points from 60% to 62%.

Summer weather in Julian

The summer transitions into a phase of relatively high temperatures. June has warm highs of 81.3°F (27.4°C) that rise to reach a scorching 87.3°F (30.7°C) by August, with nighttime lows only decreasing to around 62.8°F (17.1°C) in August. Accompanied by minimal cloud cover of 6-9%, the summer days in Julian are bright and clear, making it properly 'Mediterranean, hot summer'.

Autumn weather in Julian

Autumn in Julian brings lower temperatures and visible change in precipitation. The noticeably cooler temperatures range from a high of 76.8°F (24.9°C) in September to 61.3°F (16.3°C) in November. This period observes a significant increase in precipitation, starting from a modest 0.24" (6mm) in September to a hefty 0.71" (18mm) in November.

Winter weather in Julian

Julian's winter clutches a colder temperature range with highs from 61.3°F (16.3°C) dropping to 63.9°F (17.7°C) in February, and lows from 44.6°F (7°C) rising to a paltry 45°F (7.2°C). The notable aspect of Julian's winter is the tangible snowfall, which can range from 0.6" (15mm) in November to a reach a considerable peak of 6.7" (170mm) in February.

Weather in January

The beginning of the year in Julian, California, is marked by chilly weather. January experiences lower temperatures than subsequent months, showing a noticeable difference from February's slight warmth. Additionally, this month boasts of a high incidence of snowfall, with accumulation reaching up to 4" (102mm). Weather in January »

Weather in February

In February, the city of Julian, California, encounters slightly elevated temperatures while the humidity increases compared to January. Snowfall tends to increase, peaking at 5" (127mm). February's atmospheric pressure is marginally less than January's, signifying slightly unstable weather conditions. Weather in February »

Weather in March

March ushers in a critical transition phase in Julian's weather calendar, as the winter snowfall tends to gradually decrease. Despite less snow, rainfall still frequents the town, resulting in rich green landscapes. March records higher daytime temperatures than February, improving the overall weather attractiveness. Weather in March »

Weather in April

April announces the arrival of spring in Julian, California, with increased temperatures and extended daylight hours. Despite the slight increases, the weather remains relatively cooler than May, providing a lingering impression of spring's sparkle. Weather in April »

Weather in May

May brings forth an aura of warmth in Julian with a noticeable uptick in temperature. This rise sets it apart from April, rolling out longer and sunnier days. The rainfall decreases significantly in comparison to April and snowfall dips to an insignificant 0.6" (15mm), ushering in a period of dry spell. Weather in May »

Weather in June

June in Julian, California, marks the arrival of summer with significant increases in temperature. There is also a marked disparity in temperature highs between June and the subsequent month. Snowfall ceases entirely and the city basks in the glory of the longest daylight hours of the year, coupled with maximum sunshine hours. Weather in June »

Weather in July

The mercury soars in July, marking the height of summer in Julian. This month records the highest temperature parameter of 85.8°F (29.9°C), distinguishing it from the slightly cooler June. The city witnesses an increase in rainfall, breaking the summer dry spell. Weather in July »

Weather in August

August continues the summer trend in Julian, California, only to record slightly elevated temperatures compared to July. The city experiences the highest temperature recorded throughout the year, which adds a unique attribute. Despite the minimal precipitation, it records a decrease in relative humidity. Weather in August »

Weather in September

Continuing the warm weather trend, September sees a slight drop in temperature in comparison to August. This period also marks the cessation of rainfall altogether, indicating a return of the dry conditions. A marginal decrease in daylight hours signifies the onset of autumn. Weather in September »

Weather in October

In October, a visible drop in average temperatures indicates the arrival of autumn in Julian, California. The weather takes a colder turn compared to September, suggesting a full-fledged arrival of the fall season. Despite the decrease in rainfall, the city beholds clear blue skies and ample sunshine unveiling a vibrant canvas of autumn colors. Weather in October »

Weather in November

In November, Julian continues to cool, showing a considerable change in weather conditions from the warmth of October. This month witnesses a slight increase in rainfall coupled with reduced sunshine hours, yet outdoor activities remain popular. Weather in November »

Weather in December

December rings in the winter season in Julian, California. This month sees a noticeable drop in temperature from November, punctuated by occasional rain showers and light snowfall of about 2.5" (64mm). The daylight hours decrease significantly, giving the city a cozy and charming winter feel. Weather in December »

Frequently asked questions

How much does it rain in Julian?

Throughout the year, in Julian, California, there are 62 rainfall days, and 6.38" (162mm) of precipitation is accumulated.

When does it snow in Julian?

January through May, November and December are months with snowfall.

How much does it snow in Julian?

Throughout the year, 22.01" (559mm) of snow is accumulated.

What is the rainiest month in Julian?

February is the month with the most rainfall. Rain falls for 6.4 days and accumulates 0.94" (24mm) of precipitation.

What is the snowiest month in Julian?

March is the month with the most snowfall, with 6.69" (170mm) of accumulated snow.

When is Daylight Saving Time (DST) in Julian?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Julian, 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 Julian?

With an average relative humidity of 62%, May is the most humid month.

What is the driest month in Julian?

The month with the least rainfall is June, when the rain falls for 1.5 days and typically collects 0.08" (2mm) of precipitation.

When it does not snow in Julian?

In Julian, California, snow does not fall in June through October.

When are the longest days in Julian?

June has the longest days of the year in Julian, with an average of 14h and 18min of daylight.

What is the month with the most sunshine in Julian?

June and July, with an average of 12.1h of sunshine, are months with the most sunshine.

When is the highest UV index in Julian?

June through September, with an average maximum UV index of 6, are months with the highest UV index.

What are the warmest months in Julian?

The month of August, characterized by an average high of 87.3°F (30.7°C) and a low of 64.9°F (18.3°C), is recognized as the warmest in Julian.

What is the least humid month in Julian?

The least humid month in Julian is November, with an average relative humidity of 51%.

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

November and December, with an average maximum UV index of 3, are months with the lowest UV index in Julian.

What is the coldest month in Julian?

December, with its high-temperature average of 61.3°F (16.3°C) and a low-temperature average of 44.6°F (7°C), is the coldest month.

What is the month with the shortest days in Julian?

December has the shortest days of the year in Julian, California, with an average of 10h and 0min of daylight.

What is the month with the least sunshine in Julian?

With an average of 6.7h of sunshine, December has the least sunshine of the year.

Average temperature
Julian, CA

Average temperature - Julian, CA

The warmest month (with the highest average high temperature) is August (87.3°F).
The month with the lowest average high temperature is December (61.3°F).

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (44.2°F).


Average pressure
Julian, CA

Average pressure - Julian, CA

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).


Average wind speed
Julian, CA

Average wind speed - Julian, CA

The windiest month (with the highest average wind speed) is May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.1mph).


Average rainfall
Julian, CA

Average rainfall - Julian, CA

The wettest month (with the highest rainfall) is February (0.94").
The driest month (with the least rainfall) is June (0.08").


Average rainfall days
Julian, CA

Average rainfall days - Julian, CA

The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (1.5 days).


Average snowfall
Julian, CA

Average snowfall - Julian, CA

The month with the highest snowfall is March (6.7").
The months with the least snowfall are June, July, August, September and October (0").


Average daylight / Average sunshine
Julian, CA

Average daylight / Average sunshine - Julian, CA

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).


Average sunshine days
Julian, CA

Average sunshine days - Julian, CA

The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is July (19.4 days).


Average UV index
Julian, CA

Average UV index - Julian, CA

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are November and December (UV index 3).


Average visibility
Julian, CA

Average visibility - Julian, 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).


Julian, California, USA

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