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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 daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, the same as December, in Riverdale, California, is a moderate winter month, with an average temperature fluctuating between 59.4°F (15.2°C) and 44.2°F (6.8°C). The advent of January brings an average high-temperature of a still moderate 59.4°F (15.2°C), exhibiting minor difference from the previous month. Weather in January »
Weather in February
The last month of the winter, February, is an enjoyable month in Riverdale, California, with an average temperature varying between 62.4°F (16.9°C) and 44.6°F (7°C). Riverdale's shift from January to February is accompanied by an average high-temperature of an enjoyable 62.4°F (16.9°C), a slight deviation from 59.4°F (15.2°C). Weather in February »
Weather in March
March, the first month of the spring in Riverdale, is also an enjoyable month, with an average temperature varying between 67.8°F (19.9°C) and 47.8°F (8.8°C). March's arrival coincides with a subtle temperature rise, moving from February's 62.4°F (16.9°C) to a still comfortable 67.8°F (19.9°C). Weather in March »
Weather in April
April is a warm spring month in Riverdale, California, with an average temperature fluctuating between 74.8°F (23.8°C) and 51.4°F (10.8°C). In Riverdale, stepping into April brings a gentle temperature nudge, moving slightly up from March's comfortable 67.8°F (19.9°C) to a moderately hot 74.8°F (23.8°C). Weather in April »
Weather in May
The last month of the spring, May, is also a moderately hot month in Riverdale, California, with an average temperature fluctuating between 57°F (13.9°C) and 82.8°F (28.2°C). May's arrival coincides with a subtle temperature rise, moving from April's moderately hot 74.8°F (23.8°C) to a still warm 82.8°F (28.2°C). Weather in May »
Weather in June
The first month of the summer, June, is a tropical month in Riverdale, California, with an average temperature fluctuating between 94.6°F (34.8°C) and 63.3°F (17.4°C). With the onset of June, the average high-temperature slightly shifts from May's warm 82.8°F (28.2°C) to a hot 94.6°F (34.8°C). Weather in June »
Weather in July
July is a torrid summer month in Riverdale, California, with temperature in the range of an average low of 66.9°F (19.4°C) and an average high of 102.2°F (39°C). Riverdale records the warmest temperatures in July, averaging a high of 102.2°F (39°C) and a low of 66.9°F (19.4°C). Weather in July »
Weather in August
August, the last month of the summer in Riverdale, is also a fiery hot month, with temperature in the range of an average low of 66.2°F (19°C) and an average high of 100.9°F (38.3°C). The average high-temperature in August, at a still torrid 100.9°F (38.3°C), reveals a modest deviation from July's 102.2°F (39°C). Weather in August »
Weather in September
September, the first month of the autumn in Riverdale, is still a hot month, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 94.1°F (34.5°C). The onset of September results in a small decrease in the average high-temperature, moderately receding from a very hot 100.9°F (38.3°C) in August to a hot 94.1°F (34.5°C). Weather in September »
Weather in October
October, like September, in Riverdale, California, is a moderately hot autumn month, with an average temperature ranging between max 80.4°F (26.9°C) and min 56.5°F (13.6°C). October is characterized by a reduction in the average high-temperature, from a hot 94.1°F (34.5°C) in September to a moderately hot 80.4°F (26.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Riverdale, is also an enjoyable month, with an average temperature varying between 48.7°F (9.3°C) and 67.3°F (19.6°C). The arrival of November corresponds with a shift in temperature, down from a warm 80.4°F (26.9°C) in October to an enjoyable 67.3°F (19.6°C). Weather in November »
Weather in December
December, the first month of the winter in Riverdale, is still a refreshing month, with an average temperature ranging between min 43°F (6.1°C) and max 57.2°F (14°C). The coldest period tends to be December, when average temperatures fluctuate between a high of 57.2°F (14°C) and a low of 43°F (6.1°C). Weather in December »
Updated: Aug 18, 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
What is the most humid month?
January and December, with an average relative humidity of 66%, are most humid months.
What is the wettest month?
The months with the most rainfall are January through March, with an average 1.54" (39mm) of precipitation.
How many days does it rain?
Throughout the year, there are 58.2 rainfall days, and 9.29" (236mm) of precipitation is accumulated.
When is the lowest UV index?
January, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
When is Daylight Saving Time (DST)?
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?
The month with the longest days is June, with an average of 14h and 36min of daylight.
What is the month with the most sunshine?
June and July, with an average of 12.1h of sunshine, are months with the most sunshine.
What is the month with the highest UV index?
June through August, with an average maximum UV index of 7, are months with the highest UV index.
What time of the year is the hottest?
The highest temperatures are recorded in July, with averages reaching a high of 102.2°F (39°C) and a low of 66.9°F (19.4°C).
What is the least humid month?
July is the least humid month, with an average relative humidity of 30%.
What is the driest month?
The month with the least rainfall is August, when the rain falls for 0.8 days and typically collects 0.08" (2mm) of precipitation.
What month is the coldest?
In Riverdale, December is the month with the lowest recorded average temperatures, measuring a high of 57.2°F (14°C) and a low of 43°F (6.1°C).
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 42min of daylight.
What is the month with the least sunshine?
The month with the least sunshine in Riverdale is December, with an average of 6.4h of sunshine.
Average temperature
Riverdale, CA
The warmest month (with the highest average high temperature) is July (102.2°F).
The month with the lowest average high temperature is December (57.2°F).
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is December (43°F).
Average pressure
Riverdale, CA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.92"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Riverdale, CA
- Average wind speed in January:
4.8mph - Average wind speed in February:
5.3mph - Average wind speed in March:
5.8mph - Average wind speed in April:
6.5mph - Average wind speed in May:
6.6mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.2mph - Average wind speed in September:
5.7mph - Average wind speed in October:
5.4mph - Average wind speed in November:
4.8mph - Average wind speed in December:
4.9mph
The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are January and November (4.8mph).
Average humidity
Riverdale, CA
The months with the highest relative humidity are January and December (66%).
The month with the lowest relative humidity is July (30%).
Average rainfall
Riverdale, CA
- Average rainfall in January:
1.54" - Average rainfall in February:
1.54" - Average rainfall in March:
1.54" - Average rainfall in April:
0.94" - Average rainfall in May:
0.51" - Average rainfall in June:
0.12"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.08" - Average rainfall in September:
0.12" - Average rainfall in October:
0.47" - Average rainfall in November:
0.91" - Average rainfall in December:
1.42"
The wettest months (with the highest rainfall) are January, February and March (1.54").
The driest month (with the least rainfall) is August (0.08").
Average rainfall days
Riverdale, CA
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
7.7 days - Average rainfall days in March:
9.6 days - Average rainfall days in April:
7 days - Average rainfall days in May:
4 days - Average rainfall days in June:
1.3 days
- Average rainfall days in July:
2.3 days - Average rainfall days in August:
0.8 days - Average rainfall days in September:
1.9 days - Average rainfall days in October:
3.4 days - Average rainfall days in November:
4.7 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.8 days).
Average daylight / Average sunshine
Riverdale, CA
- Average daylight in January:
10h and 0min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 2min - Average daylight in August:
13h and 3min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January:
6h and 4min - Average sunshine in February:
6h and 3min - Average sunshine in March:
8h and 4min - Average sunshine in April:
10h and 5min - Average sunshine in May:
11h and 4min - Average sunshine in June:
12h and 1min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
12h and 0min - Average sunshine in September:
11h and 2min - Average sunshine in October:
7h and 5min - Average sunshine in November:
7h and 0min - Average sunshine in December:
6h and 2min
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 24min).
Average sunshine days
Riverdale, CA
- Average sunshine days in January:
22.8 days - Average sunshine days in February:
19.4 days - Average sunshine days in March:
20.6 days - Average sunshine days in April:
22.5 days - Average sunshine days in May:
26.4 days - Average sunshine days in June:
27.9 days
- Average sunshine days in July:
27.5 days - Average sunshine days in August:
29.3 days - Average sunshine days in September:
27.4 days - Average sunshine days in October:
27 days - Average sunshine days in November:
24.5 days - Average sunshine days in December:
21.8 days
The month with the most sunshine days is August (29.3 days).
The month with the least sunshine days is February (19.4 days).
Average UV index
Riverdale, CA
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover
Riverdale, CA
The months with the most cloud cover are March and December (Cloud cover 28).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility
Riverdale, 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).
Riverdale, California, USA
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