Average Weather in January in Castlewellan United Kingdom
Daily high temperatures are around 44°F, rarely falling below 37°F or exceeding 51°F. The lowest daily average high temperature is 44°F on January 19.
Daily low temperatures are around 37°F, rarely falling below 29°F or exceeding 45°F.
For reference, on July 31, the hottest day of the year, temperatures in Castlewellan typically range from 53°F to 64°F, while on February 17, the coldest day of the year, they range from 36°F to 45°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January in Castlewellan experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 66% throughout the month. The highest chance of overcast or mostly cloudy conditions is 68% on January 27.
The clearest day of the month is January 15, with clear, mostly clear, or partly cloudy conditions 35% of the time.
For reference, on January 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on July 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 50%.
Cloud Cover Categories in January
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Castlewellan, the chance of a wet day over the course of January is decreasing, starting the month at 43% and ending it at 38%.
For reference, the year's highest daily chance of a wet day is 43% on January 3, and its lowest chance is 27% on April 21.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Castlewellan is gradually decreasing, starting the month at 2.9 inches, when it rarely exceeds 4.5 inches or falls below 1.3 inches, and ending the month at 2.5 inches, when it rarely exceeds 4.2 inches or falls below 1.0 inches.
Average Monthly Rainfall in January
Over the course of January in Castlewellan, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 22 minutes, implying an average daily increase of 2 minutes, 44 seconds, and weekly increase of 19 minutes, 9 seconds.
The shortest day of the month is January 1, with 7 hours, 27 minutes of daylight and the longest day is January 31, with 8 hours, 49 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Castlewellan is 8:44 AM on January 1 and the earliest sunrise is 31 minutes earlier at 8:13 AM on January 31.
The earliest sunset is 4:10 PM on January 1 and the latest sunset is 51 minutes later at 5:02 PM on January 31.
Daylight saving time is observed in Castlewellan during 2021, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 4:49 AM and sets 17 hours, 12 minutes later, at 10:01 PM, while on December 21, the shortest day of the year, it rises at 8:42 AM and sets 7 hours, 19 minutes later, at 4:01 PM.
Sunrise & Sunset with Twilight in January
The figure below presents a compact representation of key lunar data for January 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in January
The chance that a given day will be muggy in Castlewellan is essentially constant during January, remaining around 0% throughout.
For reference, on August 8, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Castlewellan is gradually decreasing during January, decreasing from 17.4 miles per hour to 16.6 miles per hour over the course of the month.
For reference, on January 3, the windiest day of the year, the daily average wind speed is 17.4 miles per hour, while on July 24, the calmest day of the year, the daily average wind speed is 10.8 miles per hour.
The highest daily average wind speed during January is 17.4 miles per hour on January 6.
Average Wind Speed in January
The hourly average wind direction in Castlewellan throughout January is predominantly from the west, with a peak proportion of 41% on January 19.
Wind Direction in January
Castlewellan is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Castlewellan is gradually decreasing during January, falling by 2°F, from 49°F to 47°F, over the course of the month.
Average Water Temperature in January
The growing season in Castlewellan typically lasts for 7.1 months (218 days), from around April 10 to around November 13, rarely starting before March 13 or after May 3, and rarely ending before October 18 or after December 11.
The month of January in Castlewellan is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Castlewellan are essentially constant during January, remaining within 1°F of 1°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in Castlewellan is essentially constant during January, remaining within 0.2 kWh of 0.7 kWh throughout.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Castlewellan are 54.257 deg latitude, -5.944 deg longitude, and 371 ft elevation.
The topography within 2 miles of Castlewellan contains very significant variations in elevation, with a maximum elevation change of 837 feet and an average elevation above sea level of 349 feet. Within 10 miles contains very significant variations in elevation (2,753 feet). Within 50 miles also contains large variations in elevation (2,782 feet).
The area within 2 miles of Castlewellan is covered by grassland (69%) and trees (18%), within 10 miles by grassland (64%) and water (16%), and within 50 miles by water (50%) and grassland (38%).
This report illustrates the typical weather in Castlewellan, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Castlewellan.
For each station, the records are corrected for the elevation difference between that station and Castlewellan according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Castlewellan is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Castlewellan and a given station.
The stations contributing to this reconstruction are: Belfast International Airport (47%, 48 kilometers, north); Isle Of Man / Ronaldsway Airport (19%, 88 kilometers, east); West Freugh (18%, 92 kilometers, northeast); and Dublin Airport (17%, 95 kilometers, south).
Time zones for airports and weather stations are provided by AskGeo.com .