December weather forecastJohnstown, Ireland
December
Weather in December
December, the first month of the winter in Johnstown, is also a frosty month, with temperature in the range of an average high of 7°C (44.6°F) and an average low of 2.4°C (36.3°F).Temperature
The onset of December brings with it an average high-temperature of a still chilly 7°C (44.6°F), showing a negligible variation from the month before. The temperature in Johnstown during December nights demonstrates a small drop from the daytime highs, settling to an average of 2.4°C (36.3°F).Humidity
The most humid month is December, with an average relative humidity of 92%.Rainfall
In Johnstown, during December, the rain falls for 11 days and regularly aggregates up to 19mm (0.75") of precipitation. Throughout the year, in Johnstown, there are 142.7 rainfall days, and 221mm (8.7") of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Johnstown, during December, snow falls for 1.6 days and regularly aggregates up to 8mm (0.31") of snow. Throughout the year, in Johnstown, there are 9.7 snowfall days, and 45mm (1.77") of snow is accumulated.Daylight
December has the shortest days of the year in Johnstown, Ireland, with an average of 7h and 36min of daylight.On the first day of the month, sunrise is at 8:18 am and sunset at 4:12 pm. On the last day of December, sunrise is at 8:41 am and sunset at 4:18 pm GMT.
Sunshine
In December, the average sunshine is 3.9h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Johnstown. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 2 in December translates into these instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Johnstown, Ireland
- Average high temperature in December: 7°C
The warmest month (with the highest average high temperature) is July (17.4°C).
The month with the lowest average high temperature is January (6.6°C).
- Average low temperature in December: 2.4°C
The month with the highest average low temperature is July (10.7°C).
The coldest month (with the lowest average low temperature) is February (1.8°C).
Average pressure in December
Johnstown, Ireland
- Average pressure in December: 1011.1mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.3mbar).
Average wind speed in December
Johnstown, Ireland
- Average wind speed in December: 19.6km/h
The windiest month (with the highest average wind speed) is January (19.7km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).
Average humidity in December
Johnstown, Ireland
- Average humidity in December: 92%
The month with the highest relative humidity is December (92%).
The months with the lowest relative humidity are April and May (86%).
Average rainfall in December
Johnstown, Ireland
- Average rainfall in December: 19mm
The wettest month (with the highest rainfall) is August (26mm).
The driest months (with the least rainfall) are January and October (13mm).
Average rainfall days in December
Johnstown, Ireland
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is October (9.8 days).
Average snowfall in December
Johnstown, Ireland
- Average snowfall in December: 8mm
The months with the highest snowfall are January and February (15mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in December
Johnstown, Ireland
- Average snowfall days in December: 1.6 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Johnstown, Ireland
- Average daylight in December: 7h and 36min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in December: 3h and 54min
The month with the most sunshine is April (Average sunshine: 6h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in December
Johnstown, Ireland
- Average sunshine days in December: 15.8 days
The month with the most sunshine days is December (15.8 days).
The month with the least sunshine days is July (7.8 days).
Average UV index in December
Johnstown, Ireland
- Average UV index in December: 2
The months with the highest UV index are May, June and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Johnstown, Ireland
- Average cloud cover in December: 62
The month with the most cloud cover is July (Cloud cover 69).
The month with the least cloud cover is April (Cloud cover 58).
Average visibility in December
Johnstown, Ireland
- Average visibility in December: 9km
The months with the highest visibility are January, February, March and December (9km).
The month with the lowest visibility is July (7km).
