Climate and monthly weather forecastNapa Junction, CA
Climate and monthly weather forecast
Weather in January
January in Napa Junction, California, is a mild winter month, with temperature in the range of an average high of 56.3°F (13.5°C) and an average low of 42.3°F (5.7°C). The arrival of January sees a recorded average high-temperature of a mild 56.3°F (13.5°C), showing little divergence from the previous month's conditions. Weather in January »Weather in February
The last month of the winter, February, is another refreshing month in Napa Junction, California, with an average temperature varying between 59.4°F (15.2°C) and 42.8°F (6°C). The advent of February observes an average high-temperature of a still moderate 59.4°F (15.2°C), nearly identical to January's 56.3°F (13.5°C). Weather in February »Weather in March
March, the first month of the spring in Napa Junction, is a refreshing month, with temperature in the range of an average high of 61.3°F (16.3°C) and an average low of 44.1°F (6.7°C). The shift into March uncovers an average high-temperature of a comfortable 61.3°F (16.3°C), subtly different from the previous month. Weather in March »Weather in April
April, like March, in Napa Junction, California, is another refreshing spring month, with an average temperature ranging between max 67.1°F (19.5°C) and min 46°F (7.8°C). The commencement of April sees a minor shift in the average high-temperature, moving from 61.3°F (16.3°C) in March to a still comfortable 67.1°F (19.5°C). Weather in April »Weather in May
May, the last month of the spring in Napa Junction, is an agreeable month, with an average temperature fluctuating between 72°F (22.2°C) and 49.6°F (9.8°C). With the onset of May, Napa Junction's average high-temperature clocks in at an agreeable 72°F (22.2°C), showing a minor fluctuation from the previous month. Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Napa Junction, California, with an average temperature varying between 54.3°F (12.4°C) and 79.7°F (26.5°C). In Napa Junction, stepping into June brings a gentle temperature nudge, moving slightly up from May's pleasant 72°F (22.2°C) to a warm 79.7°F (26.5°C). Weather in June »Weather in July
July, like June, in Napa Junction, California, is a moderately hot summer month, with an average temperature ranging between min 55.8°F (13.2°C) and max 82.6°F (28.1°C). In Napa Junction, the average temperatures in July are the highest, with a peak at 82.6°F (28.1°C) and a low of 55.8°F (13.2°C). For most parts of July, the heat index is evaluated at a tropical 86°F (30°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Napa Junction, California, with an average temperature ranging between max 82°F (27.8°C) and min 56.5°F (13.6°C). The onset of August notes an average high-temperature of a still warm 82°F (27.8°C), subtly shifted from July's 82.6°F (28.1°C). Weather in August »Weather in September
September, the first month of the autumn in Napa Junction, is also a moderately hot month, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 56.3°F (13.5°C). The shift to September signals an average high-temperature of a still moderately hot 81.7°F (27.6°C), subtly varied from August's 82°F (27.8°C). Weather in September »Weather in October
October, like September, in Napa Junction, California, is a moderately hot autumn month, with an average temperature ranging between min 53.2°F (11.8°C) and max 73.6°F (23.1°C). As October commences, the average high-temperature subtly reduces, transitioning from a warm 81.7°F (27.6°C) in September to a still moderately hot 73.6°F (23.1°C). Weather in October »Weather in November
November, the last month of the autumn in Napa Junction, is also an enjoyable month, with an average temperature varying between 63.1°F (17.3°C) and 46.8°F (8.2°C). During Napa Junction's transition into November, the average high-temperature lessens, moving from a warm 73.6°F (23.1°C) in October to a refreshing 63.1°F (17.3°C). Weather in November »Weather in December
December, the first month of the winter in Napa Junction, is also a fresh month, with an average temperature fluctuating between 42.3°F (5.7°C) and 54.9°F (12.7°C). With average high temperatures of 54.9°F (12.7°C) and lows of 42.3°F (5.7°C), December is the coldest month. Weather in December »Updated: Feb 10, 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
In Napa Junction, California, during the entire year, the rain falls for 68.2 days and collects up to 11.93" (303mm) of precipitation.
The months with the lowest UV index in Napa Junction are January, February, November and December, with an average maximum UV index of 3.
February is the month with the most rainfall. Rain falls for 7.3 days and accumulates 2.32" (59mm) of precipitation.
The most humid month in Napa Junction, California, is March, with an average relative humidity of 75%.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Napa Junction, 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.
June has the longest days of the year, with an average of 14h and 48min of daylight.
The months with the highest UV index in Napa Junction, California, are June through August, with an average maximum UV index of 6.
With average high and low temperatures of 82.6°F (28.1°C) and 55.8°F (13.2°C) respectively, July is Napa Junction's warmest month.
The months with the least rainfall are July and August Rain falls for 1.3 days and accumulates 0.04" (1mm) of rain.
The months with the most sunshine are July and August, with an average of 12h of sunshine.
The least humid month in Napa Junction is September, with an average relative humidity of 58%.
December is the coldest month, with the temperature often reaching an average high of 54.9°F (12.7°C) and an average low of 42.3°F (5.7°C).
December has the shortest days of the year, with an average of 9h and 36min of daylight.
The month with the least sunshine is December, with an average of 5.7h of sunshine.
Average temperature
Napa Junction, CA
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (54.9°F).
The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (42.3°F).
Average pressure
Napa Junction, CA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"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 (29.91"Hg).
Average wind speed
Napa Junction, CA
- Average wind speed in January:
4.7mph - Average wind speed in February:
5.5mph - Average wind speed in March:
5.7mph - Average wind speed in April:
6.2mph - Average wind speed in May:
6.6mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
6mph - Average wind speed in August:
5.7mph - Average wind speed in September:
5.1mph - Average wind speed in October:
4.8mph - Average wind speed in November:
4.5mph - Average wind speed in December:
4.9mph
The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).
Average humidity
Napa Junction, CA
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (58%).
Average rainfall
Napa Junction, CA
- Average rainfall in January:
2.2" - Average rainfall in February:
2.32" - Average rainfall in March:
1.81" - Average rainfall in April:
0.67" - Average rainfall in May:
0.63" - Average rainfall in June:
0.08"
- Average rainfall in July:
0.04" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.67" - Average rainfall in November:
1.26" - Average rainfall in December:
2.13"
The wettest month (with the highest rainfall) is February (2.32").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days
Napa Junction, CA
- Average rainfall days in January:
9 days - Average rainfall days in February:
7.3 days - Average rainfall days in March:
11.9 days - Average rainfall days in April:
7.3 days - Average rainfall days in May:
4.7 days - Average rainfall days in June:
1.4 days
- Average rainfall days in July:
1.3 days - Average rainfall days in August:
0.9 days - Average rainfall days in September:
2.5 days - Average rainfall days in October:
4.6 days - Average rainfall days in November:
7.4 days - Average rainfall days in December:
9.9 days
The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is August (0.9 days).
Average daylight / Average sunshine
Napa Junction, CA
- Average daylight in January:
9h and 54min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 30min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 36min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
5h and 54min - Average sunshine in February:
6h and 6min - Average sunshine in March:
7h and 42min - Average sunshine in April:
10h and 12min - Average sunshine in May:
10h and 54min - Average sunshine in June:
11h and 42min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
11h and 6min - Average sunshine in October:
7h and 6min - Average sunshine in November:
6h and 30min - Average sunshine in December:
5h and 42min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days
Napa Junction, CA
- Average sunshine days in January:
21.3 days - Average sunshine days in February:
20.4 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
21.8 days - Average sunshine days in May:
25.7 days - Average sunshine days in June:
27.8 days
- Average sunshine days in July:
29.1 days - Average sunshine days in August:
29.1 days - Average sunshine days in September:
26.8 days - Average sunshine days in October:
25.5 days - Average sunshine days in November:
21.7 days - Average sunshine days in December:
20.1 days
The months with the most sunshine days are July and August (29.1 days).
The month with the least sunshine days is March (18.3 days).
Average UV index
Napa Junction, CA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover
Napa Junction, CA
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility
Napa Junction, 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).
