Climate and monthly weather forecast
Thornton, CA

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Weather in January

January in Thornton, California, is a moderate winter month, with an average temperature fluctuating between 56.7°F (13.7°C) and 41.2°F (5.1°C). With the transition into January, Thornton notes an average high-temperature of a mild 56.7°F (13.7°C), closely resembling December. Weather in January »

Weather in February

February, the last month of the winter in Thornton, is another mild month, with an average temperature ranging between min 41.5°F (5.3°C) and max 59.7°F (15.4°C). The start of February marks an average high-temperature of a still mild 59.7°F (15.4°C), hardly distinguishable from the conditions in January. Weather in February »

Weather in March

March, the first month of the spring in Thornton, is an enjoyable month, with an average temperature fluctuating between 63.5°F (17.5°C) and 43.3°F (6.3°C). March's onset brings an average high-temperature of a comfortable 63.5°F (17.5°C), showing a minute difference from February's 59.7°F (15.4°C). Weather in March »

Weather in April

April is a pleasant spring month in Thornton, California, with an average temperature fluctuating between 69.8°F (21°C) and 46.2°F (7.9°C). Thornton, California, perceives a slight temperature ascent during April, with average high-temperatures adjusting from an enjoyable 63.5°F (17.5°C) in March to an agreeable 69.8°F (21°C). Weather in April »

Weather in May

The last month of the spring, May, is a moderately hot month in Thornton, California, with an average temperature fluctuating between 51.1°F (10.6°C) and 77.7°F (25.4°C). With the onset of May, Thornton's average high-temperature sees a modest rise, moving from April's pleasant 69.8°F (21°C) to a moderately hot 77.7°F (25.4°C). Weather in May »

Weather in June

June, the first month of the summer in Thornton, is a tropical month, with an average temperature ranging between max 88.2°F (31.2°C) and min 56.7°F (13.7°C). The commencement of June sees a shift in the average high-temperature, moving from a warm 77.7°F (25.4°C) in May to a hot 88.2°F (31.2°C). Weather in June »

Weather in July

July, the same as June, in Thornton, California, is another hot summer month, with an average temperature varying between 93.9°F (34.4°C) and 58.6°F (14.8°C). July, noted for its average high-temperature of 93.9°F (34.4°C) and an average low-temperature of 58.6°F (14.8°C), is considered the warmest month. Throughout July, the heat index is estimated at a sweltering 100.4°F (38°C). Weather in July »

Weather in August

The last month of the summer, August, is also a hot month in Thornton, California, with an average temperature varying between 93°F (33.9°C) and 58.8°F (14.9°C). The introduction of August notes a subtle temperature variation to a still tropical 93°F (33.9°C) from July's 93.9°F (34.4°C). Weather in August »

Weather in September

September, the first month of the autumn in Thornton, is still a tropical month, with an average temperature fluctuating between 88.5°F (31.4°C) and 58.6°F (14.8°C). Thornton ushers in September with an average high-temperature of a still tropical 88.5°F (31.4°C), showing a close resemblance to the previous month. Weather in September »

Weather in October

October, like September, in Thornton, California, is another warm autumn month, with an average temperature varying between 76.8°F (24.9°C) and 53.6°F (12°C). In October, the meteorological conditions alter, with the average high-temperature shifting from a hot 88.5°F (31.4°C) in September to a moderately hot 76.8°F (24.9°C). Weather in October »

Weather in November

November, the last month of the autumn in Thornton, is another comfortable month, with an average temperature ranging between max 64°F (17.8°C) and min 45.7°F (7.6°C). During the transition into November, Thornton observes a decrease in the average high-temperature, falling from a moderately hot 76.8°F (24.9°C) in October to a refreshing 64°F (17.8°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cool month in Thornton, California, with an average temperature varying between 55°F (12.8°C) and 41°F (5°C). The lowest temperatures are recorded in December, with averages reaching a high of 55°F (12.8°C) and a low of 41°F (5°C). Weather in December »
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Frequently asked questions

How much does it rain in Thornton?

Throughout the year, in Thornton, there are 63.8 rainfall days, and 12.6" (320mm) of precipitation is accumulated.

When it does not snow in Thornton?

In Thornton, California, snow does not fall in January through November.

How many days does it snow in Thornton?

Throughout the year, there are 0.1 snowfall days.

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

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

What is the rainiest month in Thornton?

The month with the most rainfall in Thornton is February, when the rain falls for 8 days and typically aggregates up to 2.4" (61mm) of precipitation.

What is the most humid month in Thornton?

The most humid month in Thornton is March, with an average relative humidity of 75%.

When is Daylight Saving Time (DST) in Thornton?

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

When are the longest days in Thornton?

With an average of 14h and 48min of daylight, June has the longest days of the year.

What is the month with the highest UV index in Thornton?

With an average maximum UV index of 7, June is the month with the highest UV index in Thornton, California.

What month is the hottest in Thornton?

Thornton's July weather, with an average high temperature of 93.9°F (34.4°C) and an average low temperature of 58.6°F (14.8°C), tends to be the warmest of the year.

What is the least humid month in Thornton?

July is the least humid month, with an average relative humidity of 45%.

What is the driest month in Thornton?

July and August are months with the least rain in Thornton, California, when the rain falls for 1.4 days and typically aggregates up to 0.04" (1mm) of rain.

What month has the most sunshine in Thornton?

With an average of 12.1h of sunshine, July has the most sunshine of the year in Thornton.

What are the coldest months in Thornton?

December, recording an average high temperature of 55°F (12.8°C) and a low temperature of 41°F (5°C), is Thornton's coldest month.

When does it snow in Thornton?

December is the only month when snow falls.

When does it snow the most in Thornton?

December has the most snowfall days of the year in Thornton. Snow falls for 0.1 days.

What is the month with the shortest days in Thornton?

The month with the shortest days is December, with an average of 9h and 36min of daylight.

What is the month with the least sunshine in Thornton?

The month with the least sunshine is December, with an average of 5.9h of sunshine.

Average temperature
Thornton, CA

Average temperature - Thornton, CA

The warmest month (with the highest average high temperature) is July (93.9°F).
The month with the lowest average high temperature is December (55°F).

The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (41°F).

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Average pressure
Thornton, CA

Average pressure - Thornton, CA

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed
Thornton, CA

Average wind speed - Thornton, CA

The windiest months (with the highest average wind speed) are February and June (5.8mph).
The calmest month (with the lowest average wind speed) is November (4.4mph).

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Average rainfall
Thornton, CA

Average rainfall - Thornton, CA

The wettest month (with the highest rainfall) is February (2.4").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
Thornton, CA

Average rainfall days - Thornton, CA

The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is June (0.9 days).

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Average snowfall days
Thornton, CA

Average snowfall days - Thornton, CA

The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight / Average sunshine
Thornton, CA

Average daylight / Average sunshine - Thornton, CA

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days
Thornton, CA

Average sunshine days - Thornton, CA

The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is March (17.8 days).

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Average UV index
Thornton, CA

Average UV index - Thornton, CA

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average visibility
Thornton, CA

Average visibility - Thornton, 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).

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Thornton, California, USA

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