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
São Martinho's shift from November to December is accompanied by an average high-temperature of a refreshing 18.7°C (65.7°F), a slight deviation from 20°C (68°F). The nights of December in São Martinho are characterized by an average low-temperature of 17.5°C (63.5°F), subtly descending from daytime highs.Humidity
The average relative humidity in December is 74%.Rainfall
In December, in São Martinho, the rain falls for 13.4 days. Throughout December, 27mm (1.06") of precipitation is accumulated. In São Martinho, Portugal, during the entire year, the rain falls for 116.4 days and collects up to 232mm (9.13") of precipitation.Daylight
December has the shortest days of the year in São Martinho, Portugal, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 07:52 and sunset at 18:01. On the last day of December, sunrise is at 08:09 and sunset at 18:12 WET.
Sunshine
The months with the least sunshine in São Martinho, Portugal, are January and December, with an average of 7.6h of sunshine.UV index
January through June, November and December, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 5 suggests this advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What is the average December temperature in São Martinho?
What is the average humidity in December in São Martinho?
How much does it rain in São Martinho in December?
What is the month with the shortest days in São Martinho?
What is the average length of the day in December in São Martinho?
When are sunrise and sunset in December in São Martinho?
What are the months with the least sunshine in São Martinho?
How long on average sun shines in December in São Martinho?
What are the months with the lowest UV index in São Martinho?
How high is the UV index in December in São Martinho?
Average temperature in December
São Martinho, Portugal
- Average high temperature in December: 18.7°C
The warmest month (with the highest average high temperature) is August (23°C).
The months with the lowest average high temperature are February and March (16.9°C).
- Average low temperature in December: 17.5°C
The month with the highest average low temperature is September (21.7°C).
The coldest month (with the lowest average low temperature) is March (15.1°C).
Average pressure in December
São Martinho, Portugal
- Average pressure in December: 1022.4mbar
The month with the highest atmospheric pressure is January (1024.1mbar).
The month with the lowest atmospheric pressure is October (1017mbar).
Average wind speed in December
São Martinho, Portugal
- Average wind speed in December: 22.3km/h
The windiest month (with the highest average wind speed) is February (23km/h).
The calmest month (with the lowest average wind speed) is September (17.7km/h).
Average humidity in December
São Martinho, Portugal
- Average humidity in December: 74%
The months with the highest relative humidity are June and August (80%).
The month with the lowest relative humidity is February (73%).
Average rainfall in December
São Martinho, Portugal
- Average rainfall in December: 27mm
The wettest month (with the highest rainfall) is October (44mm).
The driest month (with the least rainfall) is August (3mm).
Average rainfall days in December
São Martinho, Portugal
- Average rainfall days in December: 13.4 days
The month with the highest number of rainy days is November (16 days).
The month with the least rainy days is August (3.9 days).
Average daylight in December /
Average sunshine in December
São Martinho, Portugal
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 7h and 4min
The month with the most sunshine is June (Average sunshine: 9h and 12min).
The months with the least sunshine are January and December (Average sunshine: 7h and 36min).
Average sunshine days in December
São Martinho, Portugal
- Average sunshine days in December: 12 days
The month with the most sunshine days is August (20.9 days).
The month with the least sunshine days is November (8.4 days).
Average UV index in December
São Martinho, Portugal
- Average UV index in December: 5
The months with the highest UV index are July, August, September and October (UV index 6).
The months with the lowest UV index are January, February, March, April, May, June, November and December (UV index 5).
Average cloud cover in December
São Martinho, Portugal
- Average cloud cover in December: 39
The month with the most cloud cover is November (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in December
São Martinho, Portugal
- 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).
São Martinho, Portugal
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