Climate and monthly weather forecastAlta Loma, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, is another enjoyable winter month in Alta Loma, California, with an average temperature fluctuating between 63.9°F (17.7°C) and 46°F (7.8°C). Transitioning into January, Alta Loma records an average high-temperature of a still comfortable 63.9°F (17.7°C), almost identical to December's 61.3°F (16.3°C). Weather in January »Weather in February
February, the last month of the winter in Alta Loma, is also an enjoyable month, with an average temperature ranging between min 45.1°F (7.3°C) and max 63.9°F (17.7°C). February's climate reveals an average high-temperature of a still enjoyable 63.9°F (17.7°C), consistent with January. Weather in February »Weather in March
March, the first month of the spring in Alta Loma, is still a comfortable month, with an average temperature varying between 46.6°F (8.1°C) and 67.8°F (19.9°C). With the onset of March, a modest change to a still enjoyable 67.8°F (19.9°C) from February's 63.9°F (17.7°C) is noted in high-temperature. Weather in March »Weather in April
April is a pleasant spring month in Alta Loma, California, with an average temperature varying between 72.9°F (22.7°C) and 50.2°F (10.1°C). The arrival of April brings an average high-temperature of an agreeable 72.9°F (22.7°C), nearly identical to March's 67.8°F (19.9°C). Weather in April »Weather in May
May, the last month of the spring in Alta Loma, is a moderately hot month, with temperature in the range of an average high of 76.6°F (24.8°C) and an average low of 53.2°F (11.8°C). May is marked by an average high-temperature of a moderately hot 76.6°F (24.8°C), almost identical to the preceding month. Weather in May »Weather in June
The first month of the summer, June, is still a warm month in Alta Loma, California, with an average temperature ranging between min 58.3°F (14.6°C) and max 84.7°F (29.3°C). The start of June brings a subtle rise in the average high-temperature, moving from 76.6°F (24.8°C) in May to a still moderately hot 84.7°F (29.3°C). Weather in June »Weather in July
July is a tropical summer month in Alta Loma, California, with an average temperature ranging between min 64.8°F (18.2°C) and max 90.3°F (32.4°C). The shift from June to July is marked by a slight increase in the average high-temperature, moving from a moderately hot 84.7°F (29.3°C) to a hot 90.3°F (32.4°C). Weather in July »Weather in August
August, the last month of the summer in Alta Loma, is another hot month, with an average temperature ranging between min 66.7°F (19.3°C) and max 91.2°F (32.9°C). Alta Loma registers the highest average temperatures during the month of August, with peaks of 91.2°F (32.9°C) and lows of 66.7°F (19.3°C). The heat index value during August is computed to be a tropical 93.2°F (34°C). Weather in August »Weather in September
The first month of the autumn, September, is still a hot month in Alta Loma, California, with temperature in the range of an average low of 63.9°F (17.7°C) and an average high of 88.3°F (31.3°C). September's arrival registers an average high-temperature of a still hot 88.3°F (31.3°C), closely aligning with the temperature of the previous month. Weather in September »Weather in October
October, like September, in Alta Loma, California, is a moderately hot autumn month, with temperature in the range of an average low of 57.4°F (14.1°C) and an average high of 78.8°F (26°C). October's onset corresponds with a shift in the average high-temperature, moving from a tropical 88.3°F (31.3°C) in September to a warm 78.8°F (26°C). Weather in October »Weather in November
November, the last month of the autumn in Alta Loma, is also an agreeable month, with temperature in the range of an average low of 50.9°F (10.5°C) and an average high of 70.7°F (21.5°C). The shift from October to November includes a small decrease in the average high-temperature, from a moderately hot 78.8°F (26°C) to a pleasant 70.7°F (21.5°C). Weather in November »Weather in December
December, the first month of the winter in Alta Loma, is also an enjoyable month, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 45.3°F (7.4°C). Temperature readings reach their annual highs in December, averaging 61.3°F (16.3°C) and a minimum average of 45.3°F (7.4°C). Weather in December »Updated: Jul 22, 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
Throughout the year, there are 50.5 rainfall days, and 7.56" (192mm) of precipitation is accumulated.
February, March and May, with an average relative humidity of 53%, are most humid months.
The month with the most rainfall is February, when the rain falls for 6 days and typically aggregates up to 1.73" (44mm) of precipitation.
With an average of 6.9h of sunshine, February has the least sunshine of the year.
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.
The month with the least rainfall is June, when the rain falls for 1.2 days and typically collects 0.04" (1mm) of precipitation.
With an average of 14h and 24min of daylight, June has the longest days of the year.
July has the most sunshine of the year, with an average of 12.1h of sunshine.
The months with the highest UV index are July and August, with an average maximum UV index of 7.
The average temperatures reach their apex in August, averaging 91.2°F (32.9°C) at the high end and 66.7°F (19.3°C) at the low end.
The least humid month is August, with an average relative humidity of 41%.
The coldest month is December, with an average high-temperature of 61.3°F (16.3°C) and an average low-temperature of 45.3°F (7.4°C).
December has the shortest days of the year, with an average of 9h and 54min of daylight.
With an average maximum UV index of 3, December is the month with the lowest UV index.
Average temperature
Alta Loma, CA
The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is December (61.3°F).
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is February (45.1°F).
Average pressure
Alta Loma, CA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.04"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.9"Hg - Average pressure in June:
29.86"Hg
- Average pressure in July:
29.89"Hg - Average pressure in August:
29.88"Hg - Average pressure in September:
29.88"Hg - Average pressure in October:
29.94"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed
Alta Loma, CA
- Average wind speed in January:
5.3mph - Average wind speed in February:
5.1mph - Average wind speed in March:
5.3mph - Average wind speed in April:
5.9mph - Average wind speed in May:
5.9mph - Average wind speed in June:
5.5mph
- Average wind speed in July:
5.1mph - Average wind speed in August:
4.8mph - Average wind speed in September:
4.5mph - Average wind speed in October:
4.8mph - Average wind speed in November:
5mph - Average wind speed in December:
5.2mph
The windiest months (with the highest average wind speed) are April and May (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity
Alta Loma, CA
The months with the highest relative humidity are February, March and May (53%).
The month with the lowest relative humidity is August (41%).
Average rainfall
Alta Loma, CA
- Average rainfall in January:
1.02" - Average rainfall in February:
1.73" - Average rainfall in March:
0.79" - Average rainfall in April:
0.71" - Average rainfall in May:
0.28" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.2" - Average rainfall in August:
0.12" - Average rainfall in September:
0.12" - Average rainfall in October:
0.24" - Average rainfall in November:
0.75" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days
Alta Loma, CA
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
6 days - Average rainfall days in March:
7.5 days - Average rainfall days in April:
5.9 days - Average rainfall days in May:
4.2 days - Average rainfall days in June:
1.2 days
- Average rainfall days in July:
3.1 days - Average rainfall days in August:
1.6 days - Average rainfall days in September:
2.3 days - Average rainfall days in October:
2.7 days - Average rainfall days in November:
4 days - Average rainfall days in December:
6.4 days
The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.2 days).
Average daylight / Average sunshine
Alta Loma, CA
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
7h and 0min - Average sunshine in February:
6h and 54min - Average sunshine in March:
9h and 0min - Average sunshine in April:
11h and 24min - Average sunshine in May:
11h and 48min - Average sunshine in June:
12h and 0min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 42min - Average sunshine in October:
8h and 54min - Average sunshine in November:
7h and 24min - Average sunshine in December:
7h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is February (Average sunshine: 6h and 54min).
Average sunshine days
Alta Loma, CA
- Average sunshine days in January:
24.2 days - Average sunshine days in February:
21.4 days - Average sunshine days in March:
23.3 days - Average sunshine days in April:
22.9 days - Average sunshine days in May:
24.9 days - Average sunshine days in June:
27.7 days
- Average sunshine days in July:
25.1 days - Average sunshine days in August:
26.7 days - Average sunshine days in September:
25.7 days - Average sunshine days in October:
26.5 days - Average sunshine days in November:
25.6 days - Average sunshine days in December:
23.2 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is February (21.4 days).
Average UV index
Alta Loma, CA
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover
Alta Loma, CA
The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility
Alta Loma, 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).
