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Climate and Average Weather Year Round in Belfast Canada

In Belfast, the summers are comfortable and partly cloudy and the winters are freezing, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 12°F to 73°F and is rarely below -2°F or above 81°F.

Based on the tourism score, the best time of year to visit Belfast for warm-weather activities is from early July to early September.

Climate in Belfast

freezingvery coldcoldcoolcomfortablecoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow60%60%32%32%overcastclearprecipitation: 3.3 inprecipitation: 3.3 in2.1 in2.1 inmuggy: 14%muggy: 14%0%0%drydrytourism score: 6.9tourism score: 6.90.00.0
Belfast weather by month. Click on each chart for more information.

Average Temperature in Belfast

The warm season lasts for 3.3 months, from June 13 to September 21, with an average daily high temperature above 64°F. The hottest day of the year is July 31, with an average high of 73°F and low of 61°F.

The cold season lasts for 3.3 months, from December 11 to March 22, with an average daily high temperature below 35°F. The coldest day of the year is January 30, with an average low of 12°F and high of 26°F.

Average High and Low Temperature in Belfast

Average High and Low Temperature in BelfastwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 3026°FJan 3026°FJul 3173°FJul 3173°F12°F12°F61°F61°FJun 1364°FJun 1364°FSep 2164°FSep 2164°FDec 1135°FDec 1135°FMar 2235°FMar 2235°F50°F50°F53°F53°F25°F25°F24°F24°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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 Belfast

Average Hourly Temperature in BelfastJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingvery coldvery coldcoldcoldcoolcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Bihoro, Japan (6,016 miles away) is the far-away foreign place with temperatures most similar to Belfast (view comparison).

Compare Belfast to another city:

Clouds

In Belfast, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Belfast begins around June 11 and lasts for 5.0 months, ending around November 11. On September 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 60% of the time, and overcast or mostly cloudy 40% of the time.

The cloudier part of the year begins around November 11 and lasts for 7.0 months, ending around June 11. On February 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 68% of the time, and clear, mostly clear, or partly cloudy 32% of the time.

Cloud Cover Categories in Belfast

Cloud Cover Categories in BelfastclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 360%Sep 360%Feb 1532%Feb 1532%Jun 1146%Jun 1146%Nov 1146%Nov 1146%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

Belfast does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 26% to 33%, with an average value of 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 in Belfast changes throughout the year.

Rain alone is the most common for 9.6 months, from March 13 to December 30. The highest chance of a day with rain alone is 32% on October 29.

Snow alone is the most common for 2.4 months, from December 30 to March 13. The highest chance of a day with snow alone is 15% on February 14.

Daily Chance of Precipitation in Belfast

Daily Chance of Precipitation in BelfastsnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 2133%Nov 2133%Mar 1326%Mar 1326%May 2130%May 2130%Jan 730%Jan 730%NowNowsnowrainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. Belfast experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Belfast. The most rain falls during the 31 days centered around October 30, with an average total accumulation of 3.3 inches.

The least rain falls around February 8, with an average total accumulation of 0.8 inches.

Average Monthly Rainfall in Belfast

Average Monthly Rainfall in BelfastJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inOct 303.3 inOct 303.3 inFeb 80.8 inFeb 80.8 inJun 152.5 inJun 152.5 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Belfast experiences significant seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 5.8 months, from November 11 to May 6, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 5, with an average total liquid-equivalent accumulation of 1.4 inches.

The snowless period of the year lasts for 6.2 months, from May 6 to November 11. The least snow falls around August 10, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall in Belfast

Average Liquid-Equivalent Monthly Snowfall in BelfastsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 inFeb 51.4 inFeb 51.4 inAug 100.0 inAug 100.0 inNov 110.1 inNov 110.1 inMay 60.1 inMay 60.1 inNowNow
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day in Belfast varies significantly over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 38 minutes of daylight; the longest day is June 21, with 15 hours, 46 minutes of daylight.

Hours of Daylight and Twilight in Belfast

Hours of Daylight and Twilight in BelfastJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 46 minJun 2115 hr, 46 minJun 2112 hr, 10 minSep 2212 hr, 10 minSep 228 hr, 38 minDec 218 hr, 38 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:19 AM on June 15, and the latest sunrise is 2 hours, 40 minutes later at 7:59 AM on November 6. The earliest sunset is at 4:25 PM on December 10, and the latest sunset is 4 hours, 41 minutes later at 9:06 PM on June 25.

Daylight saving time (DST) is observed in Belfast during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.

Sunrise & Sunset with Twilight and Daylight Saving Time in Belfast

Sunrise & Sunset with Twilight and Daylight Saving Time in BelfastJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:19 AMJun 155:19 AM9:06 PMJun 259:06 PMJun 25Dec 104:25 PMDec 104:25 PM7:59 AMNov 67:59 AMNov 6Mar 14DSTMar 14DSTDSTNov 7DSTNov 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Moon

The figure below presents a compact representation of key lunar data for 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.

Moon Rise, Set & Phases in Belfast

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Belfast experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.7 months, from June 25 to September 17, during which time the comfort level is muggy, oppressive, or miserable at least 4% of the time. The muggiest day of the year is August 7, with muggy conditions 14% of the time.

The least muggy day of the year is December 6, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Belfast

Humidity Comfort Levels in BelfastmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 60%Dec 60%Aug 714%Aug 714%Jun 254%Jun 254%Sep 174%Sep 174%muggymuggycomfortablecomfortabledrydryhumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Belfast experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from September 23 to April 7, with average wind speeds of more than 11.1 miles per hour. The windiest day of the year is January 8, with an average hourly wind speed of 13.6 miles per hour.

The calmer time of year lasts for 5.5 months, from April 7 to September 23. The calmest day of the year is August 1, with an average hourly wind speed of 8.6 miles per hour.

Average Wind Speed in Belfast

Average Wind Speed in BelfastwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mph22 mph22 mphJan 813.6 mphJan 813.6 mphAug 18.6 mphAug 18.6 mphSep 2311.1 mphSep 2311.1 mphApr 711.1 mphApr 711.1 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Belfast varies throughout the year.

The wind is most often from the north for 3.7 weeks, from April 9 to May 5, with a peak percentage of 31% on April 29. The wind is most often from the south for 3.1 months, from May 5 to August 7, with a peak percentage of 43% on July 15. The wind is most often from the west for 8.1 months, from August 7 to April 9, with a peak percentage of 51% on January 1.

Wind Direction in Belfast

Wind Direction in BelfastWNSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Belfast 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.9 months, from July 6 to October 2, with an average temperature above 58°F. The day of the year with the warmest water is August 14, with an average temperature of 65°F.

The time of year with cooler water lasts for 5.0 months, from December 10 to May 9, with an average temperature below 37°F. The day of the year with the coolest water is February 23, with an average temperature of 30°F.

Average Water Temperature in Belfast

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Belfast 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 Belfast for general outdoor tourist activities is from early July to early September, with a peak score in the second week of August.

Tourism Score in Belfast

Tourism Score in Belfastbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.96.90.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Belfast for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.

Beach/Pool Score in Belfast

Beach/Pool Score in BelfastJanFebMarAprMayJunJulAugSepOctNovDec002244668810103.63.60.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Belfast typically lasts for 5.9 months (181 days), from around May 5 to around November 2, rarely starting before April 17 or after May 22, and rarely ending before October 15 or after November 19.

Time Spent in Various Temperature Bands and the Growing Season in Belfast

Time Spent in Various Temperature Bands and the Growing Season in Belfastgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%May 550%May 550%Nov 250%Nov 290%May 2290%May 2290%Oct 1590%Oct 1510%Apr 1710%Apr 1710%Nov 1910%Nov 190%Feb 140%Feb 14Aug 1100%Aug 1100%NowNowfrigidfreezingvery coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Belfast should appear around May 29, only rarely appearing before May 18 or after June 9.

Growing Degree Days in Belfast

Growing Degree Days in BelfastJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°F1,400°F1,400°F1,600°F1,600°F1,800°F1,800°FMay 2990°FMay 2990°FAug 4900°FAug 4900°FDec 311,698°FDec 311,698°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

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 3.3 months, from May 12 to August 22, with an average daily incident shortwave energy per square meter above 5.4 kWh. The brightest day of the year is July 2, with an average of 6.5 kWh.

The darker period of the year lasts for 3.5 months, from October 30 to February 13, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest day of the year is December 21, with an average of 1.1 kWh.

Average Daily Incident Shortwave Solar Energy in Belfast

Average Daily Incident Shortwave Solar Energy in BelfastbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 26.5 kWhJul 26.5 kWhDec 211.1 kWhDec 211.1 kWhMay 125.4 kWhMay 125.4 kWhAug 225.4 kWhAug 225.4 kWhOct 302.2 kWhOct 302.2 kWhFeb 132.2 kWhFeb 132.2 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Belfast are 46.083 deg latitude, -62.882 deg longitude, and 56 ft elevation.

The topography within 2 miles of Belfast contains only modest variations in elevation, with a maximum elevation change of 213 feet and an average elevation above sea level of 77 feet. Within 10 miles also contains only modest variations in elevation (413 feet). Within 50 miles contains only modest variations in elevation (1,175 feet).

The area within 2 miles of Belfast is covered by trees (63%) and cropland (23%), within 10 miles by water (40%) and trees (31%), and within 50 miles by water (55%) and trees (32%).

Data Sources

This report illustrates the typical weather in Belfast, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Belfast.

For each station, the records are corrected for the elevation difference between that station and Belfast 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 Belfast is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Belfast and a given station.

The stations contributing to this reconstruction are: Charlottetown Airport (CYYG, 46%, 29 kilometers, northwest); Caribou Point Meteorological Aeronautical Presentation System (CWBK, 31%, 38 kilometers, southeast); and St. Peters (CZSP, 23%, 47 kilometers, northeast).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.