Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Derby's average high-temperature in December sits at a still warm 29.1°C (84.4°F), showing little difference from the previous month. Derby reports an average low-temperature of 18°C (64.4°F) during the nights of December.Heat index
The average heat index in December is evaluated at a hot 31°C (87.8°F). Long-standing exposure and activity could induce a feeling of tiredness and lead to heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Humidity
In December, the average relative humidity in Derby is 57%.Rainfall
December is the month with the most rainfall in Derby. Rain falls for 19.6 days and accumulates 95mm (3.74") of precipitation.Daylight
December has the longest days of the year, with an average of 13h and 42min of daylight.On the first day of the month, sunrise is at 05:11 and sunset at 18:50. On the last day of December, sunrise is at 05:23 and sunset at 19:07 SAST.
Sunshine
In Derby, the average sunshine in December is 11.3h.UV index
January through March, October through December, with an average maximum UV index of 6, are months with the highest UV index in Derby. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: The UV index of 6 during December translates into the following guidance:
Resist overexposure. Safeguarding from solar damage is indispensable. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Frequently asked questions
How hot does it get in Derby in December?
What is the average humidity in December in Derby?
What is the rainiest month in Derby?
How many days does it rain in December in Derby?
When are the longest days in Derby?
What is the average length of the day in December in Derby?
When is the sunrise / sunset in December in Derby?
How long on average sun shines in December in Derby?
When is the highest UV index in Derby?
What is the UV index reading in December in Derby?
Average temperature in December
Derby, South Africa
- Average high temperature in December: 29.1°C
The warmest month (with the highest average high temperature) is January (29.3°C).
The month with the lowest average high temperature is July (18.9°C).
- Average low temperature in December: 18°C
The months with the highest average low temperature are January and December (18°C).
The coldest month (with the lowest average low temperature) is July (6.3°C).
Average pressure in December
Derby, South Africa
- Average pressure in December: 1012.6mbar
The month with the highest atmospheric pressure is July (1024.4mbar).
The month with the lowest atmospheric pressure is January (1012.3mbar).
Average wind speed in December
Derby, South Africa
- Average wind speed in December: 8.9km/h
The windiest month (with the highest average wind speed) is October (10.6km/h).
The calmest months (with the lowest average wind speed) are March and May (7km/h).
Average humidity in December
Derby, South Africa
- Average humidity in December: 57%
The month with the highest relative humidity is February (61%).
The month with the lowest relative humidity is September (32%).
Average rainfall in December
Derby, South Africa
- Average rainfall in December: 95mm
The wettest month (with the highest rainfall) is December (95mm).
The driest months (with the least rainfall) are July and August (1mm).
Average rainfall days in December
Derby, South Africa
- Average rainfall days in December: 19.6 days
The month with the highest number of rainy days is January (20.7 days).
The month with the least rainy days is August (1 days).
Average daylight in December /
Average sunshine in December
Derby, South Africa
- Average daylight in December: 13h and 4min
The month with the longest days is December (Average daylight: 13h and 42min).
The month with the shortest days is June (Average daylight: 10h and 30min).
- Average sunshine in December: 11h and 2min
The month with the most sunshine is October (Average sunshine: 11h and 54min).
The months with the least sunshine are June and August (Average sunshine: 7h and 30min).
Average sunshine days in December
Derby, South Africa
- Average sunshine days in December: 6.9 days
The month with the most sunshine days is July (29.3 days).
The month with the least sunshine days is January (6.6 days).
Average UV index in December
Derby, South Africa
- Average UV index in December: 6
The months with the highest UV index are January, February, March, October, November and December (UV index 6).
The months with the lowest UV index are May, June and July (UV index 4).
Average cloud cover in December
Derby, South Africa
- Average cloud cover in December: 24
The months with the most cloud cover are January and December (Cloud cover 24).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in December
Derby, South Africa
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Derby, South Africa
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