Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
The average temperatures reach their apex in January, averaging 29.3°C (84.7°F) at the high end and 18°C (64.4°F) at the low end.Heat index
For most parts of January, the heat index is evaluated at a hot 32°C (89.6°F). With sustained exposure and activity, exhaustion becomes probable, resulting in heat cramps.Be advised, the heat index considers values for conditions in shade and with a light breeze. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Humidity
In Derby, the average relative humidity in January is 60%.Rainfall
In January, the rain falls for 20.7 days. Throughout January, 83mm (3.27") of precipitation is accumulated. Throughout the year, in Derby, there are 118.3 rainfall days, and 411mm (16.18") of precipitation is accumulated.Daylight
In January, the average length of the day is 13h and 33min.On the first day of January, sunrise is at 05:23 and sunset at 19:07. On the last day of the month, sunrise is at 05:46 and sunset at 19:04 SAST.
Sunshine
In January, the average sunshine in Derby is 11.5h.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 estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In January, a daily maximum UV index of 6 leads to the following instructions:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
What month is the hottest in Derby?
Is it hot in Derby during January?
What is the average humidity in January in Derby?
How much does it rain in Derby in January?
How many hours of daylight does Derby have in January?
When is the sunrise / sunset in January in Derby?
How long on average sun shines in January in Derby?
What are the months with the highest UV index in Derby?
What is the UV index reading in January in Derby?
Average temperature in January
Derby, South Africa
- Average high temperature in January: 29.3°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 January: 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 January
Derby, South Africa
- Average pressure in January: 1012.3mbar
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 January
Derby, South Africa
- Average wind speed in January: 8.1km/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 January
Derby, South Africa
- Average humidity in January: 60%
The month with the highest relative humidity is February (61%).
The month with the lowest relative humidity is September (32%).
Average rainfall in January
Derby, South Africa
- Average rainfall in January: 83mm
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 January
Derby, South Africa
- Average rainfall days in January: 20.7 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 January /
Average sunshine in January
Derby, South Africa
- Average daylight in January: 13h and 3min
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 January: 11h and 3min
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 January
Derby, South Africa
- Average sunshine days in January: 6.6 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 January
Derby, South Africa
- Average UV index in January: 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 January
Derby, South Africa
- Average cloud cover in January: 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 January
Derby, South Africa
- Average visibility in January: 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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