Monthly weather forecast and climate
Rosemont, CA

Weather in January

January in Rosemont, California, is a moderate winter month, with average temperature varying between 56.1°F (13.4°C) and 40.8°F (4.9°C). In Rosemont, the average high-temperature in January is essentially the same as in December - a moderate 56.1°F (13.4°C). Weather in January »

Weather in February

February, the last month of the winter, in Rosemont, is also a moderate month, with average temperature varying between 59°F (15°C) and 41.5°F (5.3°C). In February, the average high-temperature is almost the same as in January - a still mild 59°F (15°C). Weather in February »

Weather in March

March, the first month of the spring, in Rosemont, is a comfortable month, with average temperature fluctuating between 63°F (17.2°C) and 43.5°F (6.4°C). In March, the average high-temperature is practically the same as in February - a comfortable 63°F (17.2°C). Weather in March »

Weather in April

April is an agreeable spring month in Rosemont, California, with average temperature fluctuating between 46.6°F (8.1°C) and 69.4°F (20.8°C). In April, the average high-temperature slightly increases, from an enjoyable 63°F (17.2°C) in March, to an agreeable 69.4°F (20.8°C). Weather in April »

Weather in May

The last month of the spring, May, is a warm month in Rosemont, California, with average temperature varying between 51.3°F (10.7°C) and 77.5°F (25.3°C). In Rosemont, the average high-temperature marginally rises, from an agreeable 69.4°F (20.8°C) in April, to a moderately hot 77.5°F (25.3°C). Weather in May »

Weather in June

June, the first month of the summer, in Rosemont, is a tropical month, with average temperature varying between 88.3°F (31.3°C) and 56.8°F (13.8°C). In Rosemont, the average high-temperature rises, from a warm 77.5°F (25.3°C) in May, to a hot 88.3°F (31.3°C). Weather in June »

Weather in July

July, the same as June, in Rosemont, California, is another hot summer month, with average temperature ranging between max 94.5°F (34.7°C) and min 59.5°F (15.3°C). July is the warmest month, with an average high-temperature of 94.5°F (34.7°C) and an average low-temperature of 59.5°F (15.3°C). In July, the average heat index is estimated at a very hot 100.2°F (37.9°C). Weather in July »

Weather in August

August, the last month of the summer, in Rosemont, is another hot month, with average temperature varying between 93.4°F (34.1°C) and 59.9°F (15.5°C). In August, the average high-temperature is practically the same as in July - a still tropical 93.4°F (34.1°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a hot month in Rosemont, California, with average temperature varying between 88.3°F (31.3°C) and 58.8°F (14.9°C). In September, the average high-temperature is relatively the same as in August - a still hot 88.3°F (31.3°C). Weather in September »

Weather in October

October, like September, in Rosemont, California, is a moderately hot autumn month, with average temperature ranging between max 76.1°F (24.5°C) and min 53.6°F (12°C). In October, the average high-temperature decreases, from a hot 88.3°F (31.3°C) in September, to a moderately hot 76.1°F (24.5°C). Weather in October »

Weather in November

November, the last month of the autumn, in Rosemont, is also an enjoyable month, with temperature in the range of an average low of 45.9°F (7.7°C) and an average high of 63.5°F (17.5°C). In November, the average high-temperature drops, from a warm 76.1°F (24.5°C) in October, to a comfortable 63.5°F (17.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a fresh month in Rosemont, California, with average temperature ranging between max 54.3°F (12.4°C) and min 40.8°F (4.9°C). December is the coldest month, with an average high-temperature of 54.3°F (12.4°C) and an average low-temperature of 40.8°F (4.9°C). Weather in December »
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FAQ

How many days does it rain in Rosemont?

Throughout the year, there are 70.5 rainfall days, and 15.04" (382mm) of precipitation is accumulated.

When is the lowest UV index in Rosemont?

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

What is the most humid month in Rosemont?

With an average relative humidity of 75%, March is the most humid month in Rosemont.

What is the wettest month in Rosemont?

March is the month with the most rainfall. Rain falls for 12.6 days and accumulates 2.72" (69mm) of precipitation.

When are the longest days in Rosemont?

With an average of 14.8h of daylight, June has the longest days of the year in Rosemont.

When is the highest UV index in Rosemont?

Months with the highest UV index in Rosemont, California, are June and July, with an average maximum UV index of 7.

What is the warmest month in Rosemont?

With an average high-temperature of 94.5°F (34.7°C) and an average low-temperature of 59.5°F (15.3°C), July is the warmest month.

What is the least humid month in Rosemont?

Months with the lowest humidity in Rosemont are July and September, with an average relative humidity of 44%.

What is the driest month in Rosemont?

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

What month has the most sunshine in Rosemont?

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

What is the coldest month in Rosemont?

December is the coldest month, with an average high-temperature of 54.3°F (12.4°C) and an average low-temperature of 40.8°F (4.9°C).

What is the month with the shortest days in Rosemont?

With an average of 9.5h of daylight, December has the shortest days of the year in Rosemont, California.

What is the month with the least sunshine in Rosemont?

With an average of 5.8h of sunshine, December has the least sunshine of the year in Rosemont.

Average temperature
Rosemont, CA

Average temperature - Rosemont, CA

The warmest month (with the highest average high temperature) is July (94.5°F).
The month with the lowest average high temperature is December (54.3°F).

The month with the highest average low temperature is August (59.9°F).
The coldest months (with the lowest average low temperature) are January and December (40.8°F).

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Average pressure
Rosemont, CA

Average pressure - Rosemont, CA

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed
Rosemont, CA

Average wind speed - Rosemont, CA

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

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Average humidity
Rosemont, CA

Average humidity - Rosemont, CA

The month with the highest relative humidity is March (75%).
Months with the lowest relative humidity are July and September (44%).

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Average rainfall
Rosemont, CA

Average rainfall - Rosemont, CA

The wettest month (with the highest rainfall) is March (2.72").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days
Rosemont, CA

Average rainfall days - Rosemont, CA

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is July (1 days).

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Average daylight / Average sunshine
Rosemont, CA

Average daylight / Average sunshine - Rosemont, CA

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days
Rosemont, CA

Average sunshine days - Rosemont, CA

The month with the most sunshine days is July (29.7 days).
The month with the least sunshine days is March (17.6 days).

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Average UV index
Rosemont, CA

Average UV index - Rosemont, CA

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average visibility
Rosemont, CA

Average visibility - Rosemont, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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