Monthly weather forecast and climate
Johnstown, CA

Weather in January

January, the same as December, is another enjoyable winter month in Johnstown, California, with temperature in the range of an average high of 65.5°F (18.6°C) and an average low of 46.6°F (8.1°C). In January, the average high-temperature is essentially the same as in December - a still comfortable 65.5°F (18.6°C). Weather in January »

Weather in February

The last month of the winter, February, is also an enjoyable month in Johnstown, California, with average temperature ranging between min 46°F (7.8°C) and max 64.8°F (18.2°C). In Johnstown, the average high-temperature in February is relatively the same as in January - a still enjoyable 64.8°F (18.2°C). Weather in February »

Weather in March

March, the first month of the spring, in Johnstown, is still a comfortable month, with average temperature fluctuating between 47.8°F (8.8°C) and 67.6°F (19.8°C). In Johnstown, California, the average high-temperature in March is essentially the same as in February - a still comfortable 67.6°F (19.8°C). Weather in March »

Weather in April

April is a pleasant spring month in Johnstown, California, with average temperature fluctuating between 70.5°F (21.4°C) and 49.5°F (9.7°C). In April, the average high-temperature is almost the same as in March - a pleasant 70.5°F (21.4°C). Weather in April »

Weather in May

May, the last month of the spring, in Johnstown, is also an agreeable month, with average temperature fluctuating between 72.5°F (22.5°C) and 52.7°F (11.5°C). In May, the average high-temperature is essentially the same as in April - a still agreeable 72.5°F (22.5°C). Weather in May »

Weather in June

June, the first month of the summer, in Johnstown, is a moderately hot month, with average temperature fluctuating between 56.8°F (13.8°C) and 78.4°F (25.8°C). In June, the average high-temperature slightly increases, 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, the same as June, is a moderately hot summer month in Johnstown, California, with average temperature ranging between max 83.7°F (28.7°C) and min 63.1°F (17.3°C). In Johnstown, the average high-temperature in July is relatively the same as in June - a still warm 83.7°F (28.7°C). Weather in July »

Weather in August

August, the last month of the summer, in Johnstown, is also a moderately hot month, with average temperature ranging between min 64.9°F (18.3°C) and max 85.5°F (29.7°C). August is the warmest month, with an average high-temperature of 85.5°F (29.7°C) and an average low-temperature of 64.9°F (18.3°C). In August, the average heat index is calculated to a hot 89.1°F (31.7°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm 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). In September, the average high-temperature is essentially the same as in August - a still warm 83.3°F (28.5°C). Weather in September »

Weather in October

October, like September, in Johnstown, California, is another warm autumn month, with average temperature fluctuating between 57.7°F (14.3°C) and 77.5°F (25.3°C). In Johnstown, California, the average high-temperature in October marginally drops, 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 average temperature varying between 71.2°F (21.8°C) and 51.6°F (10.9°C). In November, the average high-temperature slightly decreases, from a warm 77.5°F (25.3°C) in October, to an agreeable 71.2°F (21.8°C). Weather in November »

Weather in December

The first month of the winter, December, is also an enjoyable month in Johnstown, California, with temperature in the range of an average high of 63.7°F (17.6°C) and an average low of 46.6°F (8.1°C). December is the coldest month, with an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 46.6°F (8.1°C). Weather in December »
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FAQ

How much does it rain in Johnstown?

In Johnstown, during the entire year, the rain falls for 49.6 days and collects up to 5.16" (131mm) of precipitation.

What is the wettest month in Johnstown?

February is the month with the most rainfall. Rain falls for 5.1 days and accumulates 1.06" (27mm) of precipitation.

What is the most humid month in Johnstown?

May is the most humid month in Johnstown, with an average relative humidity of 65%.

What is the driest month in Johnstown?

June is the month with the least rainfall in Johnstown, California. Rain falls for 1.4 days and accumulates 0.04" (1mm) of precipitation.

When are the longest days in Johnstown?

June has the longest days of the year in Johnstown, California, with an average of 14.3h of daylight.

What is the month with the most sunshine in Johnstown?

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?

Months with the highest UV index in Johnstown, California, are June through September, with an average maximum UV index of 6.

What is the warmest month in Johnstown?

August is the warmest month, with an average high-temperature of 85.5°F (29.7°C) and an average low-temperature 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 is the coldest month in Johnstown?

The coldest month is December, with an average high-temperature of 63.7°F (17.6°C) and an average low-temperature 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 of daylight.

What is the month with the least sunshine in Johnstown?

The month with the least sunshine in Johnstown, California, is December, with an average of 6.7h of sunshine.

What is the month with 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

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).

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Average pressure
Johnstown, CA

Average pressure - Johnstown, CA

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed
Johnstown, CA

Average wind speed - Johnstown, CA

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).

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Average rainfall
Johnstown, CA

Average rainfall - Johnstown, CA

The wettest month (with the highest rainfall) is February (1.06").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days
Johnstown, CA

Average rainfall days - Johnstown, CA

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).

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Average daylight / Average sunshine
Johnstown, CA

Average daylight / Average sunshine - Johnstown, CA

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

Months with the most sunshine are June and July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days
Johnstown, CA

Average sunshine days - Johnstown, CA

The month with the most sunshine days is June (28 days).
The month with the least sunshine days is July (20.7 days).

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Average visibility
Johnstown, CA

Average visibility - Johnstown, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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