Climate and monthly weather forecastJohnstown, CA
Climate and monthly weather forecast
Weather in January
January, like December, in Johnstown, California, is another refreshing winter month, with an average temperature varying between 65.5°F (18.6°C) and 46.6°F (8.1°C). As January unfolds, the average high-temperature reaches a still enjoyable 65.5°F (18.6°C), hinting at a slight fluctuation from the previous month. Weather in January »Weather in February
The last month of the winter, February, is another comfortable month in Johnstown, California, with temperature in the range of an average low of 46°F (7.8°C) and an average high of 64.8°F (18.2°C). Entering February, the average high-temperature is recorded at a still enjoyable 64.8°F (18.2°C), exhibiting a minimal shift from January's 65.5°F (18.6°C). Weather in February »Weather in March
March, the first month of the spring in Johnstown, is still a refreshing month, with an average temperature varying between 67.6°F (19.8°C) and 47.8°F (8.8°C). In March, Johnstown notes an average high-temperature of a still enjoyable 67.6°F (19.8°C), hardly different from the preceding month. Weather in March »Weather in April
April is an agreeable spring month in Johnstown, California, with an average temperature ranging between max 70.5°F (21.4°C) and min 49.5°F (9.7°C). April registers an average high-temperature of a pleasant 70.5°F (21.4°C), slightly varied from March's 67.6°F (19.8°C). Weather in April »Weather in May
May, the last month of the spring in Johnstown, is also an agreeable month, with temperature in the range of an average high of 72.5°F (22.5°C) and an average low of 52.7°F (11.5°C). The advent of May presents an average high-temperature of a still pleasant 72.5°F (22.5°C), maintaining a close correlation with the preceding month. Weather in May »Weather in June
June, the first month of the summer in Johnstown, is a moderately hot month, with an average temperature fluctuating between 56.8°F (13.8°C) and 78.4°F (25.8°C). June marks a minor ascent in the average high-temperature, adjusting from May's agreeable 72.5°F (22.5°C) to a moderately hot 78.4°F (25.8°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Johnstown, California, with an average temperature fluctuating between 83.7°F (28.7°C) and 63.1°F (17.3°C). In July, the average high-temperature registers at a still warm 83.7°F (28.7°C), nearly identical to June's 78.4°F (25.8°C). Weather in July »Weather in August
August, the last month of the summer in Johnstown, is another warm month, with an average temperature varying between 85.5°F (29.7°C) and 64.9°F (18.3°C). Johnstown's warmest month, August, generally records average temperatures ranging from a high of 85.5°F (29.7°C) to a low of 64.9°F (18.3°C). The heat index value for August is computed to be a hot 89.6°F (32°C). Weather in August »Weather in September
September, the first month of the autumn in Johnstown, is also a moderately hot month, with an average temperature varying between 63.5°F (17.5°C) and 83.3°F (28.5°C). Johnstown's September reports an average high-temperature of a still warm 83.3°F (28.5°C), exhibiting a minor difference from August. Weather in September »Weather in October
October, the same as September, is a moderately hot autumn month in Johnstown, California, with an average temperature fluctuating between 77.5°F (25.3°C) and 57.7°F (14.3°C). Transition into October subtly marks a drop in the average high-temperature, moderately moving from 83.3°F (28.5°C) in September to a still warm 77.5°F (25.3°C). Weather in October »Weather in November
The last month of the autumn, November, is another pleasant month in Johnstown, California, with an average temperature fluctuating between 71.2°F (21.8°C) and 51.6°F (10.9°C). The beginning of November brings a slight decrease in the average high-temperature, transitioning from a warm 77.5°F (25.3°C) in October to a pleasant 71.2°F (21.8°C). Weather in November »Weather in December
December, the first month of the winter in Johnstown, is also an enjoyable month, with an average temperature fluctuating between 63.7°F (17.6°C) and 46.6°F (8.1°C). With average high and low temperatures of 63.7°F (17.6°C) and 46.6°F (8.1°C) respectively, December is Johnstown's coldest month. Weather in December »Updated: Jul 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
In Johnstown, during the entire year, the rain falls for 49.6 days and collects up to 5.16" (131mm) of precipitation.
The month with the most rainfall is February, when the rain falls for 5.1 days and typically aggregates up to 1.06" (27mm) 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.
May is the most humid month, with an average relative humidity of 65%.
The month with the least rainfall in Johnstown 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 18min of daylight.
June and July, with an average of 12.1h of sunshine, are months with the most sunshine.
The months with the highest UV index in Johnstown are June through September, with an average maximum UV index of 6.
In Johnstown, August is the month with the highest recorded average temperatures, measuring a high of 85.5°F (29.7°C) and a low of 64.9°F (18.3°C).
November is the least humid month, with an average relative humidity of 52%.
December, with an average high of 63.7°F (17.6°C) and a low of 46.6°F (8.1°C), signifies the coldest month of the year.
The month with the shortest days is December, with an average of 10h and 0min of daylight.
With an average of 6.7h of sunshine, December has the least sunshine of the year.
December is the month with the lowest UV index, with an average maximum UV index of 3.
Average temperature
Johnstown, CA
The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is December (63.7°F).
The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (46°F).
Average pressure
Johnstown, CA
- Average pressure in January:
30.09"Hg - Average pressure in February:
30.04"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.91"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:
29.87"Hg - Average pressure in October:
29.93"Hg - Average pressure in November:
30.01"Hg - Average pressure in December:
30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed
Johnstown, CA
- Average wind speed in January:
4.8mph - Average wind speed in February:
5mph - Average wind speed in March:
5mph - Average wind speed in April:
5.3mph - Average wind speed in May:
5.3mph - Average wind speed in June:
4.7mph
- Average wind speed in July:
4.5mph - Average wind speed in August:
4.2mph - Average wind speed in September:
4.2mph - Average wind speed in October:
4.2mph - Average wind speed in November:
4.7mph - Average wind speed in December:
4.8mph
The windiest months (with the highest average wind speed) are April and May (5.3mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.2mph).
Average humidity
Johnstown, CA
The month with the highest relative humidity is May (65%).
The month with the lowest relative humidity is November (52%).
Average rainfall
Johnstown, CA
- Average rainfall in January:
0.55" - Average rainfall in February:
1.06" - Average rainfall in March:
0.51" - Average rainfall in April:
0.39" - Average rainfall in May:
0.2" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.35" - Average rainfall in August:
0.31" - Average rainfall in September:
0.31" - Average rainfall in October:
0.12" - Average rainfall in November:
0.59" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is February (1.06").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days
Johnstown, CA
- Average rainfall days in January:
4.7 days - Average rainfall days in February:
5.1 days - Average rainfall days in March:
6.8 days - Average rainfall days in April:
5.3 days - Average rainfall days in May:
3 days - Average rainfall days in June:
1.4 days
- Average rainfall days in July:
5 days - Average rainfall days in August:
3.7 days - Average rainfall days in September:
3.9 days - Average rainfall days in October:
2.6 days - Average rainfall days in November:
3 days - Average rainfall days in December:
5.1 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is June (1.4 days).
Average daylight / Average sunshine
Johnstown, CA
- Average daylight in January:
10h and 18min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 18min
- Average daylight in July:
14h and 6min - Average daylight in August:
13h and 18min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 24min - Average daylight in November:
10h and 30min - Average daylight in December:
10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January:
6h and 54min - Average sunshine in February:
6h and 54min - Average sunshine in March:
8h and 42min - Average sunshine in April:
11h and 6min - Average sunshine in May:
11h and 24min - 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 24min - Average sunshine in October:
9h and 6min - Average sunshine in November:
7h and 18min - Average sunshine in December:
6h and 42min
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 42min).
Average sunshine days
Johnstown, CA
- Average sunshine days in January:
25.1 days - Average sunshine days in February:
22.5 days - Average sunshine days in March:
23.3 days - Average sunshine days in April:
24.1 days - Average sunshine days in May:
26.9 days - Average sunshine days in June:
28 days
- Average sunshine days in July:
20.7 days - Average sunshine days in August:
22.6 days - Average sunshine days in September:
23.1 days - Average sunshine days in October:
27 days - Average sunshine days in November:
26.1 days - Average sunshine days in December:
25.2 days
The month with the most sunshine days is June (28 days).
The month with the least sunshine days is July (20.7 days).
Average UV index
Johnstown, 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
Johnstown, CA
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility
Johnstown, 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).
