Climate and monthly weather forecastWinnetka, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, is another comfortable winter month in Winnetka, California, with an average temperature fluctuating between 47.7°F (8.7°C) and 63.5°F (17.5°C). January brings a marginal elevation to a still enjoyable 63.5°F (17.5°C) from December's 61.9°F (16.6°C) in Winnetka's average high-temperatures. Weather in January »Weather in February
February, the last month of the winter in Winnetka, is another comfortable month, with an average temperature fluctuating between 47.1°F (8.4°C) and 63.3°F (17.4°C). The arrival of February marks a slight shift to an average high-temperature of a still refreshing 63.3°F (17.4°C) from January's 63.5°F (17.5°C). Weather in February »Weather in March
The first month of the spring, March, is still a refreshing month in Winnetka, California, with temperature in the range of an average low of 48.7°F (9.3°C) and an average high of 66.6°F (19.2°C). The arrival of March records an average high-temperature of a still comfortable 66.6°F (19.2°C), closely related to the 63.3°F (17.4°C) observed in February. Weather in March »Weather in April
April in Winnetka, California, is a pleasant spring month, with temperature in the range of an average high of 70.3°F (21.3°C) and an average low of 50.9°F (10.5°C). In Winnetka, April's average high-temperature stands at a pleasant 70.3°F (21.3°C), closely related to the preceding month. Weather in April »Weather in May
The last month of the spring, May, is a warm month in Winnetka, California, with an average temperature varying between 73.8°F (23.2°C) and 54.5°F (12.5°C). Winnetka observes an average high-temperature of a moderately hot 73.8°F (23.2°C) in May, barely different from 70.3°F (21.3°C) in April. Weather in May »Weather in June
The first month of the summer, June, is also a moderately hot month in Winnetka, California, with an average temperature varying between 79°F (26.1°C) and 58.6°F (14.8°C). Transitioning from May to June, Winnetka observes an average high-temperature of a still moderately hot 79°F (26.1°C), differing subtly from the previous month. Weather in June »Weather in July
July, the same as June, is another warm summer month in Winnetka, California, with temperature in the range of an average high of 84.2°F (29°C) and an average low of 63.7°F (17.6°C). The average high-temperature during July is a still warm 84.2°F (29°C), almost matching the conditions of the preceding month. Weather in July »Weather in August
August, the last month of the summer in Winnetka, is another warm month, with an average temperature fluctuating between 85.6°F (29.8°C) and 64.8°F (18.2°C). August, noted for its average high-temperature of 85.6°F (29.8°C) and an average low-temperature of 64.8°F (18.2°C), is considered the warmest month. In August, the heat index is calculated to be a hot 87.8°F (31°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Winnetka, California, with an average temperature ranging between max 83.1°F (28.4°C) and min 63°F (17.2°C). Winnetka experiences an average high-temperature of a still warm 83.1°F (28.4°C) in September, marking an insignificant shift from 85.6°F (29.8°C) in August. Weather in September »Weather in October
October, like September, in Winnetka, California, is another warm autumn month, with an average temperature varying between 76.8°F (24.9°C) and 58.5°F (14.7°C). The commencement of October includes a gentle temperature shift, with the average high-temperature dropping a bit from a warm 83.1°F (28.4°C) in September to a still moderately hot 76.8°F (24.9°C). Weather in October »Weather in November
The last month of the autumn, November, is also an agreeable month in Winnetka, California, with an average temperature varying between 52.7°F (11.5°C) and 69.6°F (20.9°C). In the transition to November, Winnetka observes a minor drop in the average high-temperature, shifting from a warm 76.8°F (24.9°C) in October to an agreeable 69.6°F (20.9°C). Weather in November »Weather in December
December, the first month of the winter in Winnetka, is also an enjoyable month, with an average temperature fluctuating between 46.9°F (8.3°C) and 61.9°F (16.6°C). Winnetka's coldest temperatures are experienced in December, with average high temperatures of 61.9°F (16.6°C) and lows of 46.9°F (8.3°C). Weather in December »Updated: Jun 7, 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 42.7 rainfall days, and 6.46" (164mm) of precipitation is accumulated.
In Winnetka, snow does not fall in January through November.
Throughout the year, there are 0.1 snowfall days.
The months with the least sunshine are January, February and December, with an average of 6.8h of sunshine.
February is the month with the most rainfall. Rain falls for 4.8 days and accumulates 1.22" (31mm) of precipitation.
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.
With an average relative humidity of 59%, June is the most humid month.
The month with the least rainfall is June, when the rain falls for 1.4 days and typically collects 0.04" (1mm) of precipitation.
The month with the longest days is June, with an average of 14h and 24min of daylight.
June and July, with an average of 12.1h of sunshine, are months with the most sunshine in Winnetka.
June through September, with an average maximum UV index of 6, are months with the highest UV index.
The warmest temperatures occur during August, when averages reach a peak of 85.6°F (29.8°C) and a low of 64.8°F (18.2°C).
November is the least humid month, with an average relative humidity of 47%.
December is the month when Winnetka experiences its coldest temperatures, averaging a high of 61.9°F (16.6°C) and a low of 46.9°F (8.3°C).
December is the only month when snow falls.
December has the most snowfall days of the year. Snow falls for 0.1 days.
With an average of 9h and 54min of daylight, December has the shortest days of the year.
With an average maximum UV index of 3, December is the month with the lowest UV index.
Average temperature
Winnetka, CA
The warmest month (with the highest average high temperature) is August (85.6°F).
The month with the lowest average high temperature is December (61.9°F).
The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).
Average pressure
Winnetka, CA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.9"Hg - Average pressure in October:
29.95"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Winnetka, CA
- Average wind speed in January:
6.1mph - Average wind speed in February:
5.8mph - Average wind speed in March:
5.8mph - Average wind speed in April:
6mph - Average wind speed in May:
5.5mph - Average wind speed in June:
5.1mph
- Average wind speed in July:
4.9mph - Average wind speed in August:
4.6mph - Average wind speed in September:
4.5mph - Average wind speed in October:
5mph - Average wind speed in November:
5.5mph - Average wind speed in December:
6.1mph
The windiest months (with the highest average wind speed) are January and December (6.1mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity
Winnetka, CA
The month with the highest relative humidity is June (59%).
The month with the lowest relative humidity is November (47%).
Average rainfall
Winnetka, CA
- Average rainfall in January:
1.14" - Average rainfall in February:
1.22" - Average rainfall in March:
1.02" - Average rainfall in April:
0.39" - Average rainfall in May:
0.24" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.08" - Average rainfall in September:
0.16" - Average rainfall in October:
0.12" - Average rainfall in November:
0.71" - Average rainfall in December:
1.18"
The wettest month (with the highest rainfall) is February (1.22").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days
Winnetka, CA
- Average rainfall days in January:
4.5 days - Average rainfall days in February:
4.8 days - Average rainfall days in March:
6.5 days - Average rainfall days in April:
4.8 days - Average rainfall days in May:
3.4 days - Average rainfall days in June:
1.4 days
- Average rainfall days in July:
2.6 days - Average rainfall days in August:
1.5 days - Average rainfall days in September:
2.6 days - Average rainfall days in October:
2.7 days - Average rainfall days in November:
3.2 days - Average rainfall days in December:
4.7 days
The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.4 days).
Average snowfall days
Winnetka, CA
- Average snowfall days in January:
0 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0 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 days - Average snowfall days in December:
0.1 days
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).
Average daylight / Average sunshine
Winnetka, 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:
6h and 48min - Average sunshine in February:
6h and 48min - Average sunshine in March:
8h and 48min - Average sunshine in April:
11h and 12min - Average sunshine in May:
11h and 30min - Average sunshine in June:
12h and 6min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 48min - Average sunshine in October:
8h and 30min - Average sunshine in November:
7h and 18min - Average sunshine in December:
6h and 48min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 48min).
Average sunshine days
Winnetka, CA
- Average sunshine days in January:
25.3 days - Average sunshine days in February:
22 days - Average sunshine days in March:
23.5 days - Average sunshine days in April:
24.6 days - Average sunshine days in May:
25.3 days - Average sunshine days in June:
25.6 days
- Average sunshine days in July:
26.4 days - Average sunshine days in August:
27.3 days - Average sunshine days in September:
25.5 days - Average sunshine days in October:
27.3 days - Average sunshine days in November:
25.5 days - Average sunshine days in December:
24.7 days
The months with the most sunshine days are August and October (27.3 days).
The month with the least sunshine days is February (22 days).
Average UV index
Winnetka, CA
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover
Winnetka, CA
The month with the most cloud cover is March (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 4).
Average visibility
Winnetka, 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).
