Climate and monthly weather forecastJohannesburg, CA
Climate and monthly weather forecast
Weather in January
January, the same as December, is another fresh winter month in Johannesburg, California, with an average temperature varying between 54.9°F (12.7°C) and 38.8°F (3.8°C). The average high-temperature is a still cool 54.9°F (12.7°C) in January, hardly different from the 52.5°F (11.4°C) recorded in December. Weather in January »Weather in February
The last month of the winter, February, is a mild month in Johannesburg, California, with an average temperature fluctuating between 57.4°F (14.1°C) and 40.5°F (4.7°C). The shift into February finds Johannesburg, California, at an average high-temperature of a refreshing 57.4°F (14.1°C), closely comparable to January's conditions. Weather in February »Weather in March
The first month of the spring, March, is a refreshing month in Johannesburg, California, with an average temperature fluctuating between 63.7°F (17.6°C) and 45.5°F (7.5°C). The shift into March is accompanied by a modest temperature increase, with the average high-temperature edging up from a moderate 57.4°F (14.1°C) in February to a comfortable 63.7°F (17.6°C). Weather in March »Weather in April
April in Johannesburg, California, is an agreeable spring month, with an average temperature varying between 50.4°F (10.2°C) and 70.7°F (21.5°C). April's onset is marked by a subtle temperature increase, moving from an enjoyable 63.7°F (17.6°C) in March to an agreeable 70.7°F (21.5°C). Weather in April »Weather in May
May, the last month of the spring in Johannesburg, is a moderately hot month, with temperature in the range of an average low of 57.6°F (14.2°C) and an average high of 78.4°F (25.8°C). With the transition into May, Johannesburg experiences a subtle uplift in average high-temperatures, adjusting from an agreeable 70.7°F (21.5°C) in April to a warm 78.4°F (25.8°C). Weather in May »Weather in June
June, the first month of the summer in Johannesburg, is a hot month, with temperature in the range of an average low of 66°F (18.9°C) and an average high of 90.1°F (32.3°C). Johannesburg's transition into June is marked by a rise in the average high-temperature, advancing from a warm 78.4°F (25.8°C) in May to a hot 90.1°F (32.3°C). Weather in June »Weather in July
July in Johannesburg, California, is a very hot summer month, with an average temperature varying between 72.1°F (22.3°C) and 95.9°F (35.5°C). Temperature records mark July as the warmest month, with highs averaging 95.9°F (35.5°C) and lows at 72.1°F (22.3°C). Weather in July »Weather in August
August, the last month of the summer in Johannesburg, is another tropical month, with temperature in the range of an average high of 94.5°F (34.7°C) and an average low of 71.4°F (21.9°C). With the arrival of August, Johannesburg's average high-temperature registers at a hot 94.5°F (34.7°C), indicating a subtle variation from the previous month. Weather in August »Weather in September
September, the first month of the autumn in Johannesburg, is still a tropical month, with an average temperature varying between 66.2°F (19°C) and 86.9°F (30.5°C). With the arrival of September, Johannesburg experiences a modest decline in average high-temperatures, transitioning from 94.5°F (34.7°C) in August to a still tropical 86.9°F (30.5°C). Weather in September »Weather in October
October, the same as September, is another warm autumn month in Johannesburg, California, with an average temperature varying between 74.5°F (23.6°C) and 55°F (12.8°C). As October begins, there is a decrease in the average high-temperature, falling from a hot 86.9°F (30.5°C) in September to a moderately hot 74.5°F (23.6°C). Weather in October »Weather in November
November, the last month of the autumn in Johannesburg, is another refreshing month, with an average temperature varying between 45.3°F (7.4°C) and 63°F (17.2°C). Johannesburg's weather changes with the onset of November, slightly falling from a warm 74.5°F (23.6°C) in October to a refreshing 63°F (17.2°C). Weather in November »Weather in December
December, the first month of the winter in Johannesburg, is also a fresh month, with an average temperature varying between 37.6°F (3.1°C) and 52.5°F (11.4°C). December is the month that records the lowest temperatures, with averages ranging from a high of 52.5°F (11.4°C) to a low of 37.6°F (3.1°C). Weather in December »Updated: Jul 4, 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
With an average relative humidity of 47%, January is the most humid month.
Throughout the year, there are 29.6 rainfall days, and 2.64" (67mm) of precipitation is accumulated.
January through October and December are months without snowfall.
Throughout the year, there are 0.4 snowfall days, and 0.83" (21mm) of snow is accumulated.
January and December, with an average of 7.1h of sunshine, are months with the least sunshine.
January, November and December, with an average maximum UV index of 3, are months with the lowest UV index.
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.
The month with the least rainfall is June, when the rain falls for 1.2 days and typically collects 0.04" (1mm) of precipitation.
The month with the longest days is June, with an average of 14h and 30min of daylight.
June has the most sunshine of the year, with an average of 12.2h of sunshine.
July, known for its average high temperature of 95.9°F (35.5°C) and an average low temperature of 72.1°F (22.3°C), is the warmest month in Johannesburg.
With an average maximum UV index of 8, July is the month with the highest UV index.
With an average relative humidity of 20%, August is the least humid month.
November is the only month when snow falls.
The month with the most snowfall is November, when snow falls for 0.1 days and typically aggregates up to 0.83" (21mm) of snow.
With average high temperatures of 52.5°F (11.4°C) and lows of 37.6°F (3.1°C), December is the coldest month.
December is the month with the most rainfall. Rain falls for 2.4 days and accumulates 0.35" (9mm) of precipitation.
December has the shortest days of the year in Johannesburg, with an average of 9h and 48min of daylight.
Average temperature
Johannesburg, CA
The warmest month (with the highest average high temperature) is July (95.9°F).
The month with the lowest average high temperature is December (52.5°F).
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is December (37.6°F).
Average pressure
Johannesburg, CA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
30"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.86"Hg - Average pressure in June:
29.82"Hg
- Average pressure in July:
29.86"Hg - Average pressure in August:
29.86"Hg - Average pressure in September:
29.87"Hg - Average pressure in October:
29.95"Hg - Average pressure in November:
30.04"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.82"Hg).
Average wind speed
Johannesburg, CA
- Average wind speed in January:
5.7mph - Average wind speed in February:
6.9mph - Average wind speed in March:
8.3mph - Average wind speed in April:
8.9mph - Average wind speed in May:
9.3mph - Average wind speed in June:
9.1mph
- Average wind speed in July:
8.1mph - Average wind speed in August:
7.7mph - Average wind speed in September:
7.2mph - Average wind speed in October:
6.6mph - Average wind speed in November:
6.1mph - Average wind speed in December:
5.8mph
The windiest month (with the highest average wind speed) is May (9.3mph).
The calmest month (with the lowest average wind speed) is January (5.7mph).
Average humidity
Johannesburg, CA
The month with the highest relative humidity is January (47%).
The month with the lowest relative humidity is August (20%).
Average rainfall
Johannesburg, CA
- Average rainfall in January:
0.24" - Average rainfall in February:
0.24" - Average rainfall in March:
0.24" - Average rainfall in April:
0.31" - Average rainfall in May:
0.12" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.31" - Average rainfall in August:
0.16" - Average rainfall in September:
0.12" - Average rainfall in October:
0.24" - Average rainfall in November:
0.28" - Average rainfall in December:
0.35"
The wettest month (with the highest rainfall) is December (0.35").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days
Johannesburg, CA
- Average rainfall days in January:
2.8 days - Average rainfall days in February:
2.6 days - Average rainfall days in March:
3.4 days - Average rainfall days in April:
3 days - Average rainfall days in May:
1.8 days - Average rainfall days in June:
1.2 days
- Average rainfall days in July:
4.5 days - Average rainfall days in August:
2.6 days - Average rainfall days in September:
1.9 days - Average rainfall days in October:
1.8 days - Average rainfall days in November:
1.6 days - Average rainfall days in December:
2.4 days
The month with the highest number of rainy days is July (4.5 days).
The month with the least rainy days is June (1.2 days).
Average snowfall
Johannesburg, CA
The month with the highest snowfall is November (0.83").
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and December (0").
Average snowfall days
Johannesburg, CA
- Average snowfall days in January:
0.1 days - Average snowfall days in February:
0.1 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:
0.1 days - Average snowfall days in December:
0.1 days
The months with the highest number of snowfall days are January, February, November and December (0.1 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Johannesburg, CA
- Average daylight in January:
10h and 6min - Average daylight in February:
10h and 54min - 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 30min
- Average daylight in July:
14h and 18min - 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 18min - Average daylight in December:
9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in January:
7h and 6min - Average sunshine in February:
7h and 18min - Average sunshine in March:
9h and 6min - Average sunshine in April:
11h and 36min - Average sunshine in May:
11h and 54min - Average sunshine in June:
12h and 12min
- 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 48min - Average sunshine in November:
7h and 24min - Average sunshine in December:
7h and 6min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The months with the least sunshine are January and December (Average sunshine: 7h and 6min).
Average sunshine days
Johannesburg, CA
- Average sunshine days in January:
27.3 days - Average sunshine days in February:
25.1 days - Average sunshine days in March:
27.6 days - Average sunshine days in April:
27.3 days - Average sunshine days in May:
27.7 days - Average sunshine days in June:
27.5 days
- Average sunshine days in July:
23.2 days - Average sunshine days in August:
25.3 days - Average sunshine days in September:
25.4 days - Average sunshine days in October:
27.8 days - Average sunshine days in November:
27.9 days - Average sunshine days in December:
28.1 days
The month with the most sunshine days is December (28.1 days).
The month with the least sunshine days is July (23.2 days).
Average UV index
Johannesburg, CA
The month with the highest UV index is July (UV index 8).
The months with the lowest UV index are January, November and December (UV index 3).
Average cloud cover
Johannesburg, CA
The months with the most cloud cover are January, March and December (Cloud cover 17).
The month with the least cloud cover is September (Cloud cover 4).
Average visibility
Johannesburg, 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).
