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Contents
- 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
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January is a fresh winter month in O'Brien, California, with an average temperature varying between 35.2°F (1.8°C) and 50.4°F (10.2°C). Welcoming January, O'Brien notes an average high-temperature of a fresh 50.4°F (10.2°C), nearly consistent with December's 47.8°F (8.8°C). Weather in January »
Weather in February
February, the last month of the winter in O'Brien, is also a fresh month, with an average temperature ranging between max 51.6°F (10.9°C) and min 35.1°F (1.7°C). February brings an average high-temperature of a still fresh 51.6°F (10.9°C), nearly identical to the preceding month. Weather in February »
Weather in March
March, the first month of the spring in O'Brien, is still a cool month, with an average temperature fluctuating between 37°F (2.8°C) and 54.1°F (12.3°C). As March unfolds, the average high-temperature reaches a still cool 54.1°F (12.3°C), hinting at a slight fluctuation from the previous month. Weather in March »
Weather in April
April in O'Brien, California, is a refreshing spring month, with temperature in the range of an average low of 40.3°F (4.6°C) and an average high of 62.4°F (16.9°C). April comes with a subtle rise, with the average high-temperature adjusting from a fresh 54.1°F (12.3°C) in March to a refreshing 62.4°F (16.9°C). Weather in April »
Weather in May
May, the last month of the spring in O'Brien, is a pleasant month, with temperature in the range of an average high of 71.2°F (21.8°C) and an average low of 46°F (7.8°C). As O'Brien transitions into May, the average high-temperature is observed to slightly rise from an enjoyable 62.4°F (16.9°C) in April to an agreeable 71.2°F (21.8°C). Weather in May »
Weather in June
June, the first month of the summer in O'Brien, is a warm month, with an average temperature fluctuating between 53.8°F (12.1°C) and 82.4°F (28°C). Entering June, O'Brien sees a temperature rise, with the average high-temperature advancing from May's agreeable 71.2°F (21.8°C) to a warm 82.4°F (28°C). Weather in June »
Weather in July
July is a tropical summer month in O'Brien, California, with an average temperature fluctuating between 59.4°F (15.2°C) and 91.6°F (33.1°C). In O'Brien, temperatures reach their average annual highs in July, measuring 91.6°F (33.1°C) and a minimum average of 59.4°F (15.2°C). Weather in July »
Weather in August
August, the last month of the summer in O'Brien, is another hot month, with an average temperature ranging between max 90.1°F (32.3°C) and min 58.6°F (14.8°C). The transition into August shows a subtle variation to a still tropical 90.1°F (32.3°C) from July's 91.6°F (33.1°C) in the average high-temperature. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in O'Brien, California, with an average temperature fluctuating between 54.3°F (12.4°C) and 84°F (28.9°C). During the shift to September, O'Brien records a mild decrease in average high-temperature, moving from a hot 90.1°F (32.3°C) in August to a moderately hot 84°F (28.9°C). Weather in September »
Weather in October
October, the same as September, in O'Brien, California, is another pleasant autumn month, with an average temperature varying between 46.8°F (8.2°C) and 71.4°F (21.9°C). The arrival of October corresponds with a shift in temperature, down from a warm 84°F (28.9°C) in September to a pleasant 71.4°F (21.9°C). Weather in October »
Weather in November
The last month of the autumn, November, is another refreshing month in O'Brien, California, with temperature in the range of an average high of 56.5°F (13.6°C) and an average low of 38.5°F (3.6°C). The beginning of November signals a clear reduction in the average high-temperature, falling from a pleasant 71.4°F (21.9°C) in October to a mild 56.5°F (13.6°C). Weather in November »
Weather in December
The first month of the winter, December, is also a frosty month in O'Brien, California, with an average temperature varying between 47.8°F (8.8°C) and 33.6°F (0.9°C). The month of December sees the lowest average temperatures, reaching 47.8°F (8.8°C) at the peak and 33.6°F (0.9°C) at the low. Weather in December »
Updated: Jun 16, 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 O'Brien, during the entire year, the rain falls for 102.3 days and collects up to 24.21" (615mm) of precipitation.
When does it snow?
January through March, November and December are months with snowfall.
How many days does it snow?
In O'Brien, during the entire year, snow falls for 4.6 days and aggregates up to 4.45" (113mm) of snow.
When is the lowest UV index?
February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the most humid month?
March is the most humid month, with an average relative humidity of 77%.
What is the rainiest month in O'Brien?
The month with the most rainfall is March, when the rain falls for 16.8 days and typically aggregates up to 4.8" (122mm) of precipitation.
When is Daylight Saving Time (DST) in O'Brien?
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 it does not snow in O'Brien?
In O'Brien, snow does not fall in April through October.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What are the warmest months?
July proves to be the warmest month in O'Brien, recording an average peak temperature of 91.6°F (33.1°C) and a minimum temperature of 59.4°F (15.2°C).
What is the driest month?
July is the month with the least rainfall. Rain falls for 2.5 days and accumulates 0.12" (3mm) of precipitation.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 12.2h of sunshine.
What is the month with the highest UV index in O'Brien?
The month with the highest UV index is July, with an average maximum UV index of 7.
What is the least humid month in O'Brien?
With an average relative humidity of 37%, August is the least humid month.
What is the snowiest month?
November is the month with the most snowfall in O'Brien. Snow falls for 0.5 days and accumulates 1.3" (33mm) of snow.
What time of the year is the coldest?
December is the month when O'Brien sees the average lowest temperatures, with a high of 47.8°F (8.8°C) and a low of 33.6°F (0.9°C).
What is the month with the shortest days?
With an average of 9h and 18min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
With an average of 5.3h of sunshine, December has the least sunshine of the year.
Average temperature
O'Brien, CA
The warmest month (with the highest average high temperature) is July (91.6°F).
The month with the lowest average high temperature is December (47.8°F).
The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).
Average pressure
O'Brien, CA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.95"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed
O'Brien, CA
- Average wind speed in January:
4.7mph - Average wind speed in February:
5.2mph - Average wind speed in March:
5.3mph - Average wind speed in April:
5.2mph - Average wind speed in May:
5.1mph - Average wind speed in June:
5.2mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.5mph - Average wind speed in September:
5mph - Average wind speed in October:
5.3mph - Average wind speed in November:
4.5mph - Average wind speed in December:
4.7mph
The windiest months (with the highest average wind speed) are March and October (5.3mph).
The calmest months (with the lowest average wind speed) are August and November (4.5mph).
Average humidity
O'Brien, CA
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is August (37%).
Average rainfall
O'Brien, CA
- Average rainfall in January:
4.13" - Average rainfall in February:
3.54" - Average rainfall in March:
4.8" - Average rainfall in April:
2.13" - Average rainfall in May:
1.89" - Average rainfall in June:
0.39"
The wettest month (with the highest rainfall) is March (4.8").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days
O'Brien, CA
- Average rainfall days in January:
11.9 days - Average rainfall days in February:
10.7 days - Average rainfall days in March:
16.8 days - Average rainfall days in April:
12.9 days - Average rainfall days in May:
10.3 days - Average rainfall days in June:
4.7 days
- Average rainfall days in July:
2.5 days - Average rainfall days in August:
1.7 days - Average rainfall days in September:
3.4 days - Average rainfall days in October:
5.3 days - Average rainfall days in November:
9.4 days - Average rainfall days in December:
12.7 days
The month with the highest number of rainy days is March (16.8 days).
The month with the least rainy days is August (1.7 days).
Average snowfall
O'Brien, CA
The month with the highest snowfall is November (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
O'Brien, CA
- Average snowfall days in January:
0.4 days - Average snowfall days in February:
1.9 days - Average snowfall days in March:
0.8 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:
0.5 days - Average snowfall days in December:
1 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
O'Brien, CA
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
5h and 3min - Average sunshine in February:
5h and 5min - Average sunshine in March:
7h and 1min - Average sunshine in April:
10h and 1min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 5min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
11h and 5min - Average sunshine in September:
11h and 0min - Average sunshine in October:
7h and 1min - Average sunshine in November:
6h and 1min - Average sunshine in December:
5h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days
O'Brien, CA
- Average sunshine days in January:
17.1 days - Average sunshine days in February:
15.5 days - Average sunshine days in March:
11.8 days - Average sunshine days in April:
14.8 days - Average sunshine days in May:
18.3 days - Average sunshine days in June:
23.4 days
- Average sunshine days in July:
26.3 days - Average sunshine days in August:
27.1 days - Average sunshine days in September:
25.2 days - Average sunshine days in October:
24.5 days - Average sunshine days in November:
18.8 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is August (27.1 days).
The month with the least sunshine days is March (11.8 days).
Average UV index
O'Brien, CA
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover
O'Brien, CA
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility
O'Brien, CA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is December (5mi).