Average Weather in Castlereagh United Kingdom
In Castlereagh, the summers are cool and partly cloudy; the winters are long, very cold, wet, and mostly cloudy; and it is windy year round. Over the course of the year, the temperature typically varies from 37°F to 65°F and is rarely below 29°F or above 71°F.
Based on the tourism score, the best time of year to visit Castlereagh for warm-weather activities is from late June to late August.
The warm season lasts for 3.1 months, from June 10 to September 14, with an average daily high temperature above 61°F. The hottest day of the year is July 25, with an average high of 65°F and low of 54°F.
The cool season lasts for 4.0 months, from November 19 to March 21, with an average daily high temperature below 49°F. The coldest day of the year is February 17, with an average low of 37°F and high of 45°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Castlereagh, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Castlereagh begins around April 4 and lasts for 6.4 months, ending around October 17. On July 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 50% of the time, and overcast or mostly cloudy 50% of the time.
The cloudier part of the year begins around October 17 and lasts for 5.6 months, ending around April 4. On January 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 69% of the time, and clear, mostly clear, or partly cloudy 31% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Castlereagh varies throughout the year.
The wetter season lasts 4.0 months, from October 8 to February 7, with a greater than 36% chance of a given day being a wet day. The chance of a wet day peaks at 45% on January 3.
The drier season lasts 8.0 months, from February 7 to October 8. The smallest chance of a wet day is 27% on April 29.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 44% on January 3.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Castlereagh experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Castlereagh. The most rain falls during the 31 days centered around October 25, with an average total accumulation of 3.3 inches.
The least rain falls around May 2, with an average total accumulation of 1.8 inches.
Average Monthly Rainfall
The length of the day in Castlereagh varies extremely over the course of the year. In 2018, the shortest day is December 21, with 7 hours, 15 minutes of daylight; the longest day is June 21, with 17 hours, 17 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:46 AM on June 18, and the latest sunrise is 3 hours, 59 minutes later at 8:46 AM on December 29. The earliest sunset is at 3:57 PM on December 14, and the latest sunset is 6 hours, 6 minutes later at 10:03 PM on June 24.
Daylight saving time (DST) is observed in Castlereagh during 2018, starting in the spring on March 25, lasting 7.1 months, and ending in the fall on October 28.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Castlereagh, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
The average hourly wind speed in Castlereagh experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.8 months, from October 4 to March 30, with average wind speeds of more than 14.0 miles per hour. The windiest day of the year is January 6, with an average hourly wind speed of 17.2 miles per hour.
The calmer time of year lasts for 6.2 months, from March 30 to October 4. The calmest day of the year is July 27, with an average hourly wind speed of 10.8 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Castlereagh varies throughout the year.
The wind is most often from the south for 1.4 weeks, from January 2 to January 12; for 1.7 months, from April 14 to June 6; and for 3.4 weeks, from September 29 to October 23, with a peak percentage of 39% on January 6. The wind is most often from the west for 3.1 months, from January 12 to April 14; for 3.8 months, from June 6 to September 29; and for 2.3 months, from October 23 to January 2, with a peak percentage of 40% on January 19.
Castlereagh 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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.7 months, from July 6 to October 29, with an average temperature above 55°F. The day of the year with the warmest water is August 28, with an average temperature of 57°F.
The time of year with cooler water lasts for 3.5 months, from January 16 to May 1, with an average temperature below 48°F. The day of the year with the coolest water is March 12, with an average temperature of 45°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Castlereagh throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Castlereagh for general outdoor tourist activities is from late June to late August, with a peak score in the third week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Castlereagh for hot-weather activities is from mid July to early August, with a peak score in the third week of July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season in Castlereagh typically lasts for 7.5 months (229 days), from around April 3 to around November 18, rarely starting before February 27 or after April 30, and rarely ending before October 21 or after December 19.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Castlereagh should appear around May 19, only rarely appearing before May 7 or after June 4.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.5 months, from April 29 to August 12, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest day of the year is June 14, with an average of 5.8 kWh.
The darker period of the year lasts for 4.0 months, from October 23 to February 22, with an average daily incident shortwave energy per square meter below 1.5 kWh. The darkest day of the year is December 22, with an average of 0.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Castlereagh are 54.574 deg latitude, -5.885 deg longitude, and 115 ft elevation.
The topography within 2 miles of Castlereagh contains significant variations in elevation, with a maximum elevation change of 584 feet and an average elevation above sea level of 202 feet. Within 10 miles contains significant variations in elevation (1,581 feet). Within 50 miles contains very significant variations in elevation (2,815 feet).
The area within 2 miles of Castlereagh is covered by artificial surfaces (69%) and grassland (26%), within 10 miles by grassland (49%) and artificial surfaces (24%), and within 50 miles by water (48%) and grassland (39%).
This report illustrates the typical weather in Castlereagh, 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 Castlereagh.
For each station, the records are corrected for the elevation difference between that station and Castlereagh 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 Castlereagh is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Castlereagh and a given station.
The stations contributing to this reconstruction are: Belfast International Airport (71%, 23 kilometers, northwest); West Freugh (15%, 68 kilometers, northeast); Isle Of Man / Ronaldsway Airport (8%, 98 kilometers, southeast); and Dublin Airport (6%, 131 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .