December weather forecastJohannesburg, CA
December
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).Temperature
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).Humidity
In December, the average relative humidity is 46%.Rainfall
December is the month with the most rainfall. Rain falls for 2.4 days and accumulates 0.35" (9mm) of precipitation.Snowfall
In Johannesburg, California, snow does not fall in January through October and December.Daylight
December has the shortest days of the year, with an average of 9h and 48min of daylight.On the first day of December, sunrise is at 6:41 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 4:48 pm PST.
Sunshine
January and December, with an average of 7.1h of sunshine, are months with the least sunshine.UV index
The months with the lowest UV index are January, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 3 in December leads to these guidelines:
Ensure safety - Sun damage prevention is strongly urged. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Johannesburg, CA
- Average high temperature in December: 52.5°F
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).
- Average low temperature in December: 37.6°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 in December
Johannesburg, CA
- 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 in December
Johannesburg, CA
- 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 in December
Johannesburg, CA
- Average humidity in December: 46%
The month with the highest relative humidity is January (47%).
The month with the lowest relative humidity is August (20%).
Average rainfall in December
Johannesburg, CA
- 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 in December
Johannesburg, CA
- 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 in December
Johannesburg, CA
- Average snowfall in December: 0"
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 in December
Johannesburg, CA
- 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 in December /
Average sunshine in December
Johannesburg, CA
- 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 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 in December
Johannesburg, CA
- 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 in December
Johannesburg, CA
- Average UV index in December: 3
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 in December
Johannesburg, CA
- Average cloud cover in December: 17
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 in December
Johannesburg, CA
- Average visibility in December: 6mi
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).
