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Average Weather in Grand Forks Canada

In Grand Forks, the summers are short, warm, and partly cloudy; the winters are freezing and mostly cloudy; and it is dry year round. Over the course of the year, the temperature typically varies from 21°F to 88°F and is rarely below 6°F or above 97°F.

Based on the tourism score, the best time of year to visit Grand Forks for warm-weather activities is from mid July to mid August.

Climate Summary

very coldcoldcoolcomfortablewarmhotwarmcoldJanFebMarAprMayJunJulAugSepOctNovDec75%75%26%26%clearovercastprecipitation: 1.8 inprecipitation: 1.8 in0.6 in0.6 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 6.8tourism score: 6.80.00.0
Click on each chart for more information.

Temperature

The hot season lasts for 2.7 months, from June 20 to September 10, with an average daily high temperature above 76°F. The hottest day of the year is August 4, with an average high of 88°F and low of 57°F.

The cold season lasts for 3.4 months, from November 13 to February 26, with an average daily high temperature below 41°F. The coldest day of the year is January 1, with an average low of 21°F and high of 30°F.

Average High and Low Temperature

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

Average Hourly Temperature in Grand ForksJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingfreezingvery coldvery coldcoldcoldcoolwarmcomfortable
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.

Zvolen, Slovakia (5,241 miles away) and Apriltsi, Bulgaria (5,718 miles) are the far-away foreign places with temperatures most similar to Grand Forks (view comparison).

Clouds

In Grand Forks, 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 Grand Forks begins around June 6 and lasts for 4.0 months, ending around October 8. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time.

The cloudier part of the year begins around October 8 and lasts for 8.0 months, ending around June 6. On January 10, the cloudiest day of the year, the sky is overcast or mostly cloudy 74% of the time, and clear, mostly clear, or partly cloudy 26% of the time.

Cloud Cover Categories

Cloud Cover Categories in Grand ForksclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 375%Aug 375%Jan 1026%Jan 1026%Jun 651%Jun 651%Oct 851%Oct 851%clearpartly cloudyovercastmostly cloudymostly clear
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

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

The wetter season lasts 8.3 months, from October 19 to June 27, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 34% on November 21.

The drier season lasts 3.7 months, from June 27 to October 19. The smallest chance of a wet day is 10% on August 22.

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 Grand Forks changes throughout the year.

Rain alone is the most common for 10 months, from January 30 to December 9. The highest chance of a day with rain alone is 31% on May 27.

Snow alone is the most common for 1.7 months, from December 9 to January 30. The highest chance of a day with snow alone is 17% on December 28.

Daily Chance of Precipitation

Daily Chance of Precipitation in Grand ForkssnowrainJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 2134%Nov 2134%Aug 2210%Aug 2210%Jan 3019%Jan 3019%Jun 2722%Jun 2722%snowrainmixed
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. Grand Forks experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Grand Forks. The most rain falls during the 31 days centered around June 4, with an average total accumulation of 1.8 inches.

The least rain falls around January 15, with an average total accumulation of 0.5 inches.

Average Monthly Rainfall

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. Grand Forks experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.4 months, from October 30 to March 12, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 28, with an average total liquid-equivalent accumulation of 0.8 inches.

The snowless period of the year lasts for 7.6 months, from March 12 to October 30. The least snow falls around July 21, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in Grand ForkssnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 inDec 280.8 inDec 280.8 inJul 210.0 inJul 210.0 inOct 300.1 inOct 300.1 inMar 120.1 inMar 120.1 in
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 Grand Forks varies extremely over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 13 minutes of daylight; the longest day is June 21, with 16 hours, 13 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Grand ForksJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2016 hr, 13 minJun 2116 hr, 13 minJun 2112 hr, 11 minSep 2212 hr, 11 minSep 228 hr, 13 minDec 218 hr, 13 minDec 21nightnightday
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 4:48 AM on June 16, and the latest sunrise is 2 hours, 59 minutes later at 7:47 AM on December 31. The earliest sunset is at 3:56 PM on December 11, and the latest sunset is 5 hours, 6 minutes later at 9:02 PM on June 25.

Daylight saving time (DST) is observed in Grand Forks during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Grand ForksJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 164:48 AMJun 164:48 AM9:02 PMJun 259:02 PMJun 25Dec 113:56 PMDec 113:56 PM7:47 AMDec 317:47 AMDec 31Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunset
The solar day over the course of the year 2018. 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.

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.

The perceived humidity level in Grand Forks, 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

Humidity Comfort Levels in Grand ForksJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 30%Feb 30%Aug 120%Aug 120%drydry
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 Grand Forks does not vary significantly over the course of the year, remaining within 0.2 miles per hour of 3.6 miles per hour throughout.

Average Wind Speed

Average Wind Speed in Grand ForksJanFebMarAprMayJunJulAugSepOctNovDec0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mph4.5 mph5.0 mph5.5 mphApr 183.8 mphApr 183.8 mphJan 283.3 mphJan 283.3 mph
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 Grand Forks varies throughout the year.

The wind is most often from the south for 3.3 weeks, from March 22 to April 14 and for 1.8 months, from October 3 to November 26, with a peak percentage of 38% on November 5. The wind is most often from the west for 5.6 months, from April 14 to October 3, with a peak percentage of 37% on June 20. The wind is most often from the east for 3.9 months, from November 26 to March 22, with a peak percentage of 43% on January 1.

Wind Direction

Wind Direction in Grand ForksESWSEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
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).

Best Time of Year to Visit

To characterize how pleasant the weather is in Grand Forks 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 Grand Forks for general outdoor tourist activities is from mid July to mid August, with a peak score in the last week of July.

Tourism Score

Tourism Score in Grand ForksJanFebMarAprMayJunJulAugSepOctNovDec02468106.86.80.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Grand Forks for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.

Beach/Pool Score

Beach/Pool Score in Grand ForksJanFebMarAprMayJunJulAugSepOctNovDec02468103.33.30.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
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 Grand Forks typically lasts for 5.5 months (166 days), from around April 26 to around October 10, rarely starting before April 2 or after May 18, and rarely ending before September 21 or after October 29.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Grand Forksgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Apr 2650%Apr 2650%Oct 1050%Oct 1050%May 1890%May 1890%Sep 2190%Sep 2190%Apr 210%Apr 210%Oct 2910%Oct 2910%Jul 19100%Jul 19100%freezingvery coldcoldcoolwarmfrigidcomfortablehot
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 Grand Forks should appear around April 27, only rarely appearing before April 18 or after May 8.

Growing Degree Days

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 21, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is July 18, with an average of 7.3 kWh.

The darker period of the year lasts for 3.8 months, from October 24 to February 17, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest day of the year is December 23, with an average of 0.9 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Grand ForksbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJul 187.3 kWhJul 187.3 kWhDec 230.9 kWhDec 230.9 kWhMay 126.0 kWhMay 126.0 kWhOct 242.2 kWhOct 242.2 kWhFeb 172.2 kWhFeb 172.2 kWh
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 Grand Forks are 49.033 deg latitude, -118.436 deg longitude, and 1,913 ft elevation.

The topography within 2 miles of Grand Forks contains large variations in elevation, with a maximum elevation change of 2,329 feet and an average elevation above sea level of 2,054 feet. Within 10 miles contains large variations in elevation (4,649 feet). Within 50 miles also contains extreme variations in elevation (7,352 feet).

The area within 2 miles of Grand Forks is covered by sparse vegetation (44%), shrubs (24%), and grassland (19%), within 10 miles by trees (70%) and shrubs (16%), and within 50 miles by trees (67%) and shrubs (18%).

Data Sources

This report illustrates the typical weather in Grand Forks, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Grand Forks.

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

The stations contributing to this reconstruction are: West Kootenay Regional Airport (65%, 52 kilometers, east) and Osoyoos Automatic Weather Reporting System (35%, 73 kilometers, west).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.