Expand
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, like December, in Johnstown, California, is another enjoyable winter month, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 65.5°F (18.6°C). Johnstown experiences a minor change to a still enjoyable 65.5°F (18.6°C) in average high-temperature during January, closely reflecting December. Weather in January »
Weather in February
The last month of the winter, February, is another refreshing month in Johnstown, California, with an average temperature ranging between max 64.8°F (18.2°C) and min 46°F (7.8°C). The average high-temperature is a still comfortable 64.8°F (18.2°C) in February, hardly different from the 65.5°F (18.6°C) recorded in January. Weather in February »
Weather in March
The first month of the spring, March, is still a refreshing month in Johnstown, California, with an average temperature ranging between max 67.6°F (19.8°C) and min 47.8°F (8.8°C). The arrival of March sees an average high-temperature of a still enjoyable 67.6°F (19.8°C), hardly diverging from February's 64.8°F (18.2°C). Weather in March »
Weather in April
April is a pleasant spring month in Johnstown, California, with an average temperature ranging between min 49.5°F (9.7°C) and max 70.5°F (21.4°C). The advent of April brings an average high-temperature of a pleasant 70.5°F (21.4°C), exhibiting minor difference from the previous month. Weather in April »
Weather in May
May, the last month of the spring in Johnstown, is also an agreeable month, with an average temperature fluctuating between 72.5°F (22.5°C) and 52.7°F (11.5°C). Johnstown's average high-temperature in May is a still pleasant 72.5°F (22.5°C), indicating a subtle variation from April. Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Johnstown, California, with temperature in the range of an average high of 78.4°F (25.8°C) and an average low of 56.8°F (13.8°C). June brings a slight rise in Johnstown's average high-temperature, moving from an agreeable 72.5°F (22.5°C) in May to a warm 78.4°F (25.8°C). Weather in June »
Weather in July
July, like June, in Johnstown, California, is another warm summer month, with an average temperature fluctuating between 63.1°F (17.3°C) and 83.7°F (28.7°C). Johnstown's entry into July measures an average high-temperature of a still warm 83.7°F (28.7°C), closely parallel to the preceding month. Weather in July »
Weather in August
August, the last month of the summer in Johnstown, is another warm month, with temperature in the range of an average high of 85.5°F (29.7°C) and an average low of 64.9°F (18.3°C). With average high and low temperatures of 85.5°F (29.7°C) and 64.9°F (18.3°C) respectively, August is Johnstown's warmest month. For August, the heat index is calculated to be a tropical 89.6°F (32°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Johnstown, California, with temperature in the range of an average high of 83.3°F (28.5°C) and an average low of 63.5°F (17.5°C). The initiation of September records an average high-temperature of a still warm 83.3°F (28.5°C), displaying a near consistency with the previous month. 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). The advent of October brings a slight shift in average high-temperature, moving from a warm 83.3°F (28.5°C) in September to a still moderately hot 77.5°F (25.3°C). Weather in October »
Weather in November
November, the last month of the autumn in Johnstown, is another pleasant month, with temperature in the range of an average low of 51.6°F (10.9°C) and an average high of 71.2°F (21.8°C). The transition into November subtly indicates a reduction in the average high-temperature, down to a pleasant 71.2°F (21.8°C) from October's warm 77.5°F (25.3°C). Weather in November »
Weather in December
December, the first month of the winter in Johnstown, is still a refreshing month, with temperature in the range of an average low of 46.6°F (8.1°C) and an average high of 63.7°F (17.6°C). December stands out as Johnstown's coldest month, with an average high-temperature of 63.7°F (17.6°C) and a low-temperature of 46.6°F (8.1°C). Weather in December »
[Resources]Frequently asked questions
How many days does it rain in Johnstown?
Throughout the year, in Johnstown, there are 49.6 rainfall days, and 5.16" (131mm) of precipitation is accumulated.
What is the rainiest month in Johnstown?
February is the month with the most rainfall. Rain falls for 5.1 days and accumulates 1.06" (27mm) of precipitation.
When is Daylight Saving Time (DST) in Johnstown?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Johnstown, California, 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.
What is the most humid month in Johnstown?
With an average relative humidity of 65%, May is the most humid month in Johnstown, California.
What is the driest month in Johnstown?
The month with the least rainfall in Johnstown, California, is June, when the rain falls for 1.4 days and typically collects 0.04" (1mm) of precipitation.
When are the longest days in Johnstown?
With an average of 14h and 18min of daylight, June has the longest days of the year.
What are the months with the most sunshine in Johnstown?
The months with the most sunshine are June and July, with an average of 12.1h of sunshine.
What are the months with the highest UV index in Johnstown?
The months with the highest UV index in Johnstown, California, are June through September, with an average maximum UV index of 6.
What time of the year is the hottest in Johnstown?
Johnstown's warmest temperatures are experienced in August, with average high temperatures of 85.5°F (29.7°C) and lows of 64.9°F (18.3°C).
What is the least humid month in Johnstown?
The least humid month in Johnstown is November, with an average relative humidity of 52%.
What month is the coldest in Johnstown?
December is the coldest month, with the temperature often reaching an average high of 63.7°F (17.6°C) and an average low of 46.6°F (8.1°C).
What is the month with the shortest days in Johnstown?
The month with the shortest days is December, with an average of 10h and 0min of daylight.
What is the month with the least sunshine in Johnstown?
December has the least sunshine of the year in Johnstown, California, with an average of 6.7h of sunshine.
When is the lowest UV index in Johnstown?
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 2min - 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 5min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 1min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 3min - 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 5min - Average sunshine in February:
6h and 5min - Average sunshine in March:
8h and 4min - Average sunshine in April:
11h and 1min - Average sunshine in May:
11h and 2min - 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:
10h and 2min - Average sunshine in October:
9h and 1min - Average sunshine in November:
7h and 2min - Average sunshine in December:
6h and 4min
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).
Johnstown, California, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location
