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Climate and Average Weather Year Round in Clarence-Rockland Canada

In Clarence-Rockland, the summers are long, comfortable, and partly cloudy and the winters are freezing, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 3°F to 79°F and is rarely below -16°F or above 86°F.

Based on the tourism score, the best time of year to visit Clarence-Rockland for warm-weather activities is from late June to late August.

Climate in Clarence-Rockland

freezingcoldcoolwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow64%64%30%30%clearovercastprecipitation: 3.2 inprecipitation: 3.2 in1.6 in1.6 inmuggy: 19%muggy: 19%0%0%drydrytourism score: 6.5tourism score: 6.50.00.0
Clarence-Rockland weather by month. Click on each chart for more information.

The warm season lasts for 3.9 months, from May 19 to September 17, with an average daily high temperature above 67°F. The hottest month of the year in Clarence-Rockland is July, with an average high of 78°F and low of 58°F.

The cold season lasts for 3.3 months, from December 3 to March 11, with an average daily high temperature below 33°F. The coldest month of the year in Clarence-Rockland is January, with an average low of 5°F and high of 22°F.

Average High and Low Temperature in Clarence-Rockland

Average High and Low Temperature in Clarence-RocklandwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-20°F-20°F-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 2922°FJan 2922°FJul 1979°FJul 1979°F3°F3°F58°F58°FMay 1967°FMay 1967°FSep 1767°FSep 1767°FDec 333°FDec 333°FMar 1133°FMar 1133°F46°F46°F47°F47°F20°F20°F15°F15°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 22°F26°F36°F53°F66°F75°F78°F76°F68°F55°F41°F28°F
Temp. 13°F16°F27°F42°F56°F64°F68°F66°F58°F46°F35°F21°F
Low 5°F7°F19°F33°F45°F54°F58°F55°F48°F37°F27°F14°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 Clarence-Rockland

Average Hourly Temperature in Clarence-RocklandJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfrigidfrigidfreezingfreezingvery coldcoldcoldcoolcomfortablewarmvery coldfrigid
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.

Lipetsk, Russia (4,645 miles away); Samara, Russia (4,899 miles); and Akabira, Japan (5,875 miles) are the far-away foreign places with temperatures most similar to Clarence-Rockland (view comparison).

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© OpenStreetMap contributors

Compare Clarence-Rockland to another city:

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In Clarence-Rockland, 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 Clarence-Rockland begins around May 25 and lasts for 4.9 months, ending around October 23.

The clearest month of the year in Clarence-Rockland is August, during which on average the sky is clear, mostly clear, or partly cloudy 63% of the time.

The cloudier part of the year begins around October 23 and lasts for 7.1 months, ending around May 25.

The cloudiest month of the year in Clarence-Rockland is January, during which on average the sky is overcast or mostly cloudy 68% of the time.

Cloud Cover Categories in Clarence-Rockland

Cloud Cover Categories in Clarence-RocklandclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 964%Aug 964%Jan 530%Jan 530%May 2547%May 2547%Oct 2347%Oct 2347%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 68%66%61%56%53%48%39%37%41%51%60%67%
Clearer 32%34%39%44%47%52%61%63%59%49%40%33%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Clarence-Rockland varies throughout the year.

The wetter season lasts 8.1 months, from April 8 to December 10, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in Clarence-Rockland is July, with an average of 11.9 days with at least 0.04 inches of precipitation.

The drier season lasts 3.9 months, from December 10 to April 8. The month with the fewest wet days in Clarence-Rockland is February, with an average of 6.7 days with at least 0.04 inches of precipitation.

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 Clarence-Rockland changes throughout the year.

Rain alone is the most common for 8.7 months, from March 14 to December 4. The month with the most days of rain alone in Clarence-Rockland is July, with an average of 11.9 days.

Snow alone is the most common for 3.3 months, from December 4 to March 14. The month with the most days of snow alone in Clarence-Rockland is January, with an average of 5.1 days.

Daily Chance of Precipitation in Clarence-Rockland

Daily Chance of Precipitation in Clarence-RocklandsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jul 739%Jul 739%Jan 2922%Jan 2922%Mar 1425%Mar 1425%Dec 429%Dec 429%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 0.9d0.9d3.5d7.7d10.1d10.9d11.9d10.3d9.4d9.6d5.9d2.0d
Mixed 1.7d1.5d1.9d1.1d0.1d0.0d0.0d0.0d0.0d0.3d1.5d2.6d
Snow 5.1d4.2d2.7d0.3d0.0d0.0d0.0d0.0d0.0d0.0d1.2d4.3d
Any 7.6d6.7d8.0d9.1d10.2d10.9d11.9d10.3d9.4d9.9d8.7d8.8d

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. Clarence-Rockland experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Clarence-Rockland. The month with the most rain in Clarence-Rockland is July, with an average rainfall of 3.1 inches.

The month with the least rain in Clarence-Rockland is February, with an average rainfall of 0.5 inches.

Average Monthly Rainfall in Clarence-Rockland

Average Monthly Rainfall in Clarence-RocklandJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 inJun 253.2 inJun 253.2 inFeb 60.5 inFeb 60.5 inSep 273.1 inSep 273.1 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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 0.6″0.5″1.2″2.3″2.6″3.1″3.1″2.8″3.0″2.9″2.0″1.0″

Snowfall

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

The snowy period of the year lasts for 5.9 months, from October 26 to April 24, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Clarence-Rockland is December, with an average snowfall of 13.2 inches.

The snowless period of the year lasts for 6.1 months, from April 24 to October 26. The least snow falls around July 26, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Clarence-Rockland

Average Monthly Snowfall in Clarence-RocklandsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inDec 2413.7 inDec 2413.7 inJul 260.0 inJul 260.0 inFeb 2212.0 inFeb 2212.0 inOct 261.0 inOct 261.0 inApr 241.0 inApr 241.0 in
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 11.9″11.8″8.3″1.8″0.1″0.0″0.0″0.0″0.0″0.4″4.9″13.2″

The length of the day in Clarence-Rockland varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 42 minutes of daylight; the longest day is June 20, with 15 hours, 42 minutes of daylight.

Hours of Daylight and Twilight in Clarence-Rockland

Hours of Daylight and Twilight in Clarence-RocklandJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 42 minJun 2015 hr, 42 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 228 hr, 42 minDec 218 hr, 42 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 9.2h10.4h12.0h13.6h14.9h15.6h15.3h14.0h12.5h10.9h9.5h8.8h

The earliest sunrise is at 5:11 AM on June 15, and the latest sunrise is 2 hours, 31 minutes later at 7:42 AM on November 2. The earliest sunset is at 4:17 PM on December 9, and the latest sunset is 4 hours, 37 minutes later at 8:54 PM on June 25.

Daylight saving time (DST) is observed in Clarence-Rockland 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 Clarence-Rockland

Sunrise & Sunset with Twilight and Daylight Saving Time in Clarence-RocklandJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:11 AMJun 155:11 AM8:54 PMJun 258:54 PMJun 25Dec 94:17 PMDec 94:17 PM7:42 AMNov 27:42 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 Clarence-Rockland

Solar Elevation and Azimuth in Clarence-RocklandJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM000101010102020203030304040506000010101020202020303040405050602168NowNow
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 Clarence-Rockland

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.

Clarence-Rockland experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.3 months, from June 5 to September 15, during which time the comfort level is muggy, oppressive, or miserable at least 5% of the time. The month with the most muggy days in Clarence-Rockland is July, with 5.5 days that are muggy or worse.

The least muggy day of the year is February 18, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Clarence-Rockland

Humidity Comfort Levels in Clarence-RocklandmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 180%Feb 180%Jul 2619%Jul 2619%Jun 55%Jun 55%Sep 155%Sep 155%NowNowmuggymuggycomfortablecomfortabledrydryhumidhumid
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 0.0d0.0d0.0d0.0d0.3d2.5d5.5d4.3d1.4d0.1d0.0d0.0d

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 Clarence-Rockland experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.5 months, from December 8 to April 24, with average wind speeds of more than 5.7 miles per hour. The windiest month of the year in Clarence-Rockland is February, with an average hourly wind speed of 7.5 miles per hour.

The calmer time of year lasts for 7.5 months, from April 24 to December 8. The calmest month of the year in Clarence-Rockland is August, with an average hourly wind speed of 3.9 miles per hour.

Average Wind Speed in Clarence-Rockland

Average Wind Speed in Clarence-RocklandwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphFeb 197.6 mphFeb 197.6 mphJul 303.7 mphJul 303.7 mphDec 85.7 mphDec 85.7 mphApr 245.7 mphApr 245.7 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) 6.97.57.16.04.94.23.93.94.34.85.35.9

The predominant average hourly wind direction in Clarence-Rockland varies throughout the year.

The wind is most often from the south for 6.0 days, from September 13 to September 19, with a peak percentage of 33% on September 17. The wind is most often from the west for 12 months, from September 19 to September 13, with a peak percentage of 39% on January 1.

Wind Direction in Clarence-Rockland

Wind Direction in Clarence-RocklandWWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
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).

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

Tourism Score in Clarence-Rockland

Tourism Score in Clarence-Rocklandbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.56.50.00.0NowNowtemperaturetemperature 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 Clarence-Rockland for hot-weather activities is from early July to mid August, with a peak score in the third week of July.

Beach/Pool Score in Clarence-Rockland

Beach/Pool Score in Clarence-RocklandJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.44.40.00.0NowNowtemperaturetemperature 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 Clarence-Rockland typically lasts for 4.8 months (146 days), from around May 9 to around October 2, rarely starting before April 22 or after May 26, and rarely ending before September 15 or after October 19.

Time Spent in Various Temperature Bands and the Growing Season in Clarence-Rockland

Time Spent in Various Temperature Bands and the Growing Season in Clarence-Rocklandgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 950%May 950%Oct 250%Oct 250%May 2690%May 2690%Sep 1590%Sep 1590%Apr 2210%Apr 2210%Oct 1910%Oct 1910%0%Feb 190%Feb 19Jul 22100%Jul 22100%NowNowfrigidfreezingcoolcomfortablewarmcoldvery cold
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 Clarence-Rockland should appear around May 5, only rarely appearing before April 25 or after May 15.

Growing Degree Days in Clarence-Rockland

Growing Degree Days in Clarence-RocklandJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°FMay 590°FMay 590°FJul 10900°FJul 10900°FSep 11,800°FSep 11,800°FDec 312,144°FDec 312,144°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 3.5 months, from May 4 to August 21, with an average daily incident shortwave energy per square meter above 5.6 kWh. The brightest month of the year in Clarence-Rockland is June, with an average of 6.5 kWh.

The darker period of the year lasts for 3.5 months, from October 26 to February 11, with an average daily incident shortwave energy per square meter below 2.3 kWh. The darkest month of the year in Clarence-Rockland is December, with an average of 1.2 kWh.

Average Daily Incident Shortwave Solar Energy in Clarence-Rockland

Average Daily Incident Shortwave Solar Energy in Clarence-RocklandbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 296.7 kWhJun 296.7 kWhDec 161.2 kWhDec 161.2 kWhMay 45.6 kWhMay 45.6 kWhAug 215.6 kWhAug 215.6 kWhOct 262.3 kWhOct 262.3 kWhFeb 112.3 kWhFeb 112.3 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) 1.52.43.74.95.96.56.55.74.42.81.61.2

For the purposes of this report, the geographical coordinates of Clarence-Rockland are 45.550 deg latitude, -75.291 deg longitude, and 164 ft elevation.

The topography within 2 miles of Clarence-Rockland contains only modest variations in elevation, with a maximum elevation change of 207 feet and an average elevation above sea level of 167 feet. Within 10 miles contains only modest variations in elevation (965 feet). Within 50 miles also contains very significant variations in elevation (1,939 feet).

The area within 2 miles of Clarence-Rockland is covered by water (32%), trees (31%), cropland (23%), and artificial surfaces (12%), within 10 miles by trees (47%) and cropland (37%), and within 50 miles by trees (65%) and cropland (22%).

This report illustrates the typical weather in Clarence-Rockland, 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 Clarence-Rockland.

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

The stations contributing to this reconstruction are:

  • Gatineau Airport (CYND, 63%, 13 mi, west, 46 ft elevation change)
  • Cornwall Regional Airport (CTCK, 23%, 26 mi, southeast, 115 ft elevation change)
  • Harrington (CMHN, 14%, 36 mi, northeast, 387 ft elevation change)

Sources mapCYND, 63%13 mi, 46 ftCTCK, 23%26 mi, 115 ftCMHN, 14%36 mi, 387 ft© OpenStreetMap contributors

To get a sense of how much these sources agree with each other, you can view a comparison of Clarence-Rockland 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.