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Climate and Average Weather Year Round in Summerside Prince Edward Island, Canada

In Summerside, the summers are comfortable; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 11°F to 74°F and is rarely below -3°F or above 81°F.

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

Climate in Summerside

freezingvery coldcoldcoolcomfortablecoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow60%60%33%33%overcastclearprecipitation: 3.4 inprecipitation: 3.4 in2.3 in2.3 inmuggy: 17%muggy: 17%0%0%drydrytourism score: 6.9tourism score: 6.90.00.0
Summerside weather by month. Click on each chart for more information.

The warm season lasts for 3.3 months, from June 9 to September 18, with an average daily high temperature above 65°F. The hottest month of the year in Summerside is July, with an average high of 73°F and low of 60°F.

The cold season lasts for 3.4 months, from December 7 to March 19, with an average daily high temperature below 35°F. The coldest month of the year in Summerside is January, with an average low of 13°F and high of 26°F.

Average High and Low Temperature in Summerside

Average High and Low Temperature in SummersidewarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 3025°FJan 3025°FJul 3174°FJul 3174°F11°F11°F61°F61°FJun 965°FJun 965°FSep 1865°FSep 1865°FDec 735°FDec 735°FMar 1935°FMar 1935°F50°F50°F52°F52°F25°F25°F22°F22°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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 26°F27°F34°F45°F57°F67°F73°F72°F65°F54°F43°F32°F
Temp. 19°F20°F27°F38°F49°F59°F66°F66°F59°F48°F38°F27°F
Low 13°F13°F22°F32°F42°F52°F60°F59°F53°F43°F33°F21°F

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 Summerside

Average Hourly Temperature in SummersideJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingfreezingvery 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 (5,981 miles away) is the far-away foreign place with temperatures most similar to Summerside (view comparison).

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© OpenStreetMap contributors

Compare Summerside to another city:

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In Summerside, 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 Summerside begins around June 14 and lasts for 4.8 months, ending around November 7.

The clearest month of the year in Summerside is September, during which on average the sky is clear, mostly clear, or partly cloudy 57% of the time.

The cloudier part of the year begins around November 7 and lasts for 7.2 months, ending around June 14.

The cloudiest month of the year in Summerside is February, during which on average the sky is overcast or mostly cloudy 66% of the time.

Cloud Cover Categories in Summerside

Cloud Cover Categories in SummersideclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 260%Sep 260%Feb 1633%Feb 1633%Jun 1446%Jun 1446%Nov 746%Nov 746%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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 66%66%63%61%61%53%46%43%43%47%56%62%
Clearer 34%34%37%39%39%47%54%57%57%53%44%38%

Summerside 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 25% 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 Summerside changes throughout the year.

Rain alone is the most common for 9.1 months, from March 16 to December 18. The month with the most days of rain alone in Summerside is June, with an average of 9.5 days.

Snow alone is the most common for 2.9 months, from December 18 to March 16. The month with the most days of snow alone in Summerside is January, with an average of 4.5 days.

Daily Chance of Precipitation in Summerside

Daily Chance of Precipitation in SummersidesnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 1333%Jun 1333%Mar 1325%Mar 1325%Dec 1831%Dec 1831%Apr 1329%Apr 1329%Jan 1929%Jan 1929%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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 1.9d1.4d2.8d6.1d8.9d9.5d9.4d9.0d8.8d9.2d7.4d4.1d
Mixed 2.5d2.3d2.5d1.5d0.3d0.0d0.0d0.0d0.0d0.1d1.5d2.5d
Snow 4.5d4.0d2.7d0.8d0.1d0.0d0.0d0.0d0.0d0.0d0.4d3.0d
Any 8.9d7.6d8.0d8.3d9.2d9.5d9.4d9.0d8.8d9.3d9.3d9.6d

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. Summerside experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Summerside. The month with the most rain in Summerside is October, with an average rainfall of 3.2 inches.

The month with the least rain in Summerside is February, with an average rainfall of 0.8 inches.

Average Monthly Rainfall in Summerside

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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 0.9″0.8″1.2″1.9″2.5″2.7″2.6″2.6″3.0″3.2″3.0″1.8″

Snowfall

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

The snowy period of the year lasts for 6.0 months, from November 3 to May 5, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Summerside is February, with an average snowfall of 15.7 inches.

The snowless period of the year lasts for 6.0 months, from May 5 to November 3. The least snow falls around August 9, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Summerside

Average Monthly Snowfall in SummersidesnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 in30 in30 in35 in35 inFeb 116.5 inFeb 116.5 inAug 90.0 inAug 90.0 inNov 31.0 inNov 31.0 inMay 51.0 inMay 51.0 inNowNow
The average 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 15.2″15.7″11.8″4.2″0.3″0.0″0.0″0.0″0.0″0.1″2.7″10.7″

The length of the day in Summerside varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 35 minutes of daylight; the longest day is June 20, with 15 hours, 49 minutes of daylight.

Hours of Daylight and Twilight in Summerside

Hours of Daylight and Twilight in SummersideJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2015 hr, 49 minJun 2015 hr, 49 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 228 hr, 35 minDec 218 hr, 35 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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.1h10.4h12.0h13.6h15.0h15.7h15.4h14.1h12.5h10.9h9.4h8.7h

The earliest sunrise is at 5:22 AM on June 15, and the latest sunrise is 2 hours, 37 minutes later at 7:58 AM on November 2. The earliest sunset is at 4:28 PM on December 10, and the latest sunset is 4 hours, 44 minutes later at 9:11 PM on June 25.

Daylight saving time (DST) is observed in Summerside during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Summerside

Sunrise & Sunset with Twilight and Daylight Saving Time in SummersideJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:22 AMJun 155:22 AM9:11 PMJun 259:11 PMJun 25Dec 104:28 PMDec 104:28 PM7:58 AMNov 27:58 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Summerside

Solar Elevation and Azimuth in SummersideJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0001010101020202030303040405060000101010202020203030404050506067NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. 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 Summerside

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.

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.

Summerside experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.7 months, from June 24 to September 13, during which time the comfort level is muggy, oppressive, or miserable at least 4% of the time. The month with the most muggy days in Summerside is August, with 4.1 days that are muggy or worse.

The least muggy day of the year is March 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Summerside

Humidity Comfort Levels in SummersidemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 110%Mar 110%Aug 117%Aug 117%Jun 244%Jun 244%Sep 134%Sep 134%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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.8d3.9d4.1d1.2d0.1d0.0d0.0d

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 Summerside experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.7 months, from September 24 to April 14, with average wind speeds of more than 11.7 miles per hour. The windiest month of the year in Summerside is December, with an average hourly wind speed of 13.9 miles per hour.

The calmer time of year lasts for 5.3 months, from April 14 to September 24. The calmest month of the year in Summerside is July, with an average hourly wind speed of 9.5 miles per hour.

Average Wind Speed in Summerside

Average Wind Speed in SummersidewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mph22 mph22 mphJan 814.1 mphJan 814.1 mphJul 319.3 mphJul 319.3 mphSep 2411.7 mphSep 2411.7 mphApr 1411.7 mphApr 1411.7 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 13.813.012.711.610.29.89.59.811.212.613.313.9

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

The wind is most often from the north for 3.9 weeks, from April 6 to May 3, with a peak percentage of 31% on April 13. The wind is most often from the south for 3.4 months, from May 3 to August 16, with a peak percentage of 44% on July 14. The wind is most often from the west for 7.7 months, from August 16 to April 6, with a peak percentage of 52% on January 1.

Wind Direction in Summerside

Wind Direction in SummersideWNSWJanFebMarAprMayJunJulAugSepOctNovDec0%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).

Summerside 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 2 to September 28, with an average temperature above 58°F. The month of the year in Summerside with the warmest water is August, with an average temperature of 64°F.

The time of year with cooler water lasts for 4.9 months, from December 8 to May 4, with an average temperature below 37°F. The month of the year in Summerside with the coolest water is February, with an average temperature of 31°F.

Average Water Temperature in Summerside

Average Water Temperature in SummersidewarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec30°F30°F40°F40°F50°F50°F60°F60°F70°F70°FAug 1165°FAug 1165°F30°FFeb 2330°FFeb 23Jul 258°FJul 258°FSep 2858°FSep 2858°FDec 837°FDec 837°FMay 437°FMay 437°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 32°F31°F31°F34°F41°F52°F62°F64°F61°F53°F44°F36°F

To characterize how pleasant the weather is in Summerside 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 Summerside for general outdoor tourist activities is from late June to early September, with a peak score in the first week of August.

Tourism Score in Summerside

Tourism Score in Summersidebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.96.90.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism 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 Summerside for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.

Beach/Pool Score in Summerside

Beach/Pool Score in SummersideJanFebMarAprMayJunJulAugSepOctNovDec002244668810103.83.80.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/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.

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 Summerside typically lasts for 5.7 months (175 days), from around May 4 to around October 25, rarely starting before April 17 or after May 20, and rarely ending before October 10 or after November 11.

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

Time Spent in Various Temperature Bands and the Growing Season in Summersidegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 450%May 450%Oct 2550%Oct 2550%May 2090%May 2090%Oct 1090%Oct 1090%Apr 1710%Apr 1710%Nov 1110%Nov 1110%Aug 2100%Aug 2100%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 Summerside should appear around May 27, only rarely appearing before May 17 or after June 4.

Growing Degree Days in Summerside

Growing Degree Days in SummersideJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°FMay 2790°FMay 2790°FAug 1900°FAug 1900°FDec 311,737°FDec 311,737°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 3.4 months, from May 11 to August 22, with an average daily incident shortwave energy per square meter above 5.4 kWh. The brightest month of the year in Summerside is June, with an average of 6.3 kWh.

The darker period of the year lasts for 3.5 months, from October 28 to February 13, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest month of the year in Summerside is December, with an average of 1.1 kWh.

Average Daily Incident Shortwave Solar Energy in Summerside

Average Daily Incident Shortwave Solar Energy in SummersidebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 16.5 kWhJul 16.5 kWhDec 141.1 kWhDec 141.1 kWhMay 115.4 kWhMay 115.4 kWhAug 225.4 kWhAug 225.4 kWhOct 282.2 kWhOct 282.2 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.42.33.54.65.66.36.35.64.32.81.61.1

For the purposes of this report, the geographical coordinates of Summerside are 46.396 deg latitude, -63.788 deg longitude, and 39 ft elevation.

The topography within 2 miles of Summerside contains only modest variations in elevation, with a maximum elevation change of 125 feet and an average elevation above sea level of 30 feet. Within 10 miles also contains only modest variations in elevation (200 feet). Within 50 miles contains only modest variations in elevation (607 feet).

The area within 2 miles of Summerside is covered by water (34%), cropland (33%), and artificial surfaces (21%), within 10 miles by water (43%) and cropland (37%), and within 50 miles by water (60%) and trees (26%).

This report illustrates the typical weather in Summerside, 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 Summerside.

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

The stations contributing to this reconstruction are:

Sources mapCWSD, 95%3 mi, 0 ftCAHR, 4%30 mi, 135 ftCXNP, 2%50 mi, 26 ft© OpenStreetMap contributors

To get a sense of how much these sources agree with each other, you can view a comparison of Summerside and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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 © OpenStreetMap contributors.

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.

Please review our full terms contained on our Terms of Service page.