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Average Weather in Terrebonne Oregon, United States

In Terrebonne, the summers are short, warm, dry, and mostly clear and the winters are chilly and partly cloudy. Over the course of the year, the temperature typically varies from 25°F to 88°F and is rarely below 12°F or above 96°F.

The hot season lasts for 2.7 months, from June 21 to September 12, with an average daily high temperature above 78°F. The hottest day of the year is August 3, with an average high of 88°F and low of 51°F.

The cold season lasts for 3.4 months, from November 13 to February 24, with an average daily high temperature below 51°F. The coldest day of the year is December 23, with an average low of 25°F and high of 41°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 Terrebonne12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecfreezingchillycoldcoolcomfortablewarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

In Terrebonne, 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 Terrebonne begins around June 12 and lasts for 3.8 months, ending around October 7. On July 28, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 84% of the time, and overcast or mostly cloudy 16% of the time.

The cloudier part of the year begins around October 7 and lasts for 8.2 months, ending around June 12. On January 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 62% of the time, and clear, mostly clear, or partly cloudy 38% of the time.

Cloud Cover

Cloud Cover in Terrebonneclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 1662%Jan 1662%Jul 2816%Jul 2816%Jun 1239%Jun 1239%Oct 739%Oct 739%overcastmostly cloudypartly cloudymostly clearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 5.7 months, from October 23 to April 13, with a greater than 21% chance of a given day being a wet day. The chance of a wet day peaks at 37% on November 28.

The drier season lasts 6.3 months, from April 13 to October 23. The smallest chance of a wet day is 6% on August 7.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 29% on November 21.

Daily Chance of Precipitation

Daily Chance of Precipitation in Terrebonnewetwetdry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecNov 2837%Nov 2837%Aug 76%Aug 76%Oct 2321%Oct 2321%Apr 1321%Apr 1321%snowmixedrain
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. Terrebonne experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.5 months, from September 16 to July 1, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around December 2, with an average total accumulation of 2.2 inches.

The rainless period of the year lasts for 2.5 months, from July 1 to September 16. The least rain falls around August 4, with an average total accumulation of 0.3 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. Terrebonne experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 3.9 months, from November 5 to March 2, 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 23, with an average total liquid-equivalent accumulation of 0.4 inches.

The snowless period of the year lasts for 8.1 months, from March 2 to November 5. The least snow falls around August 5, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in Terrebonnesnowsnow0.0 in0.5 in1.0 in1.5 in2.0 inJanFebMarAprMayJunJulAugSepOctNovDecDec 230.4 inDec 230.4 inAug 50.0 inAug 50.0 inNov 50.1 inNov 50.1 inMar 20.1 inMar 20.1 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 Terrebonne varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 51 minutes of daylight; the longest day is June 21, with 15 hours, 32 minutes of daylight.

Hours of Daylight and Twilight

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, 27 minutes later at 7:46 AM on November 4. The earliest sunset is at 4:25 PM on December 9, and the latest sunset is 4 hours, 28 minutes later at 8:53 PM on June 26.

Daylight saving time (DST) is observed in Terrebonne during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Terrebonne12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 155:19 AMJun 155:19 AM8:53 PMJun 268:53 PMJun 26Dec 94:25 PMDec 94:25 PM7:46 AMNov 47:46 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
The solar day over the course of the year 2017. 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 Terrebonne, 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 Terrebonne0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 270%Feb 270%Aug 290%Aug 290%comfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Terrebonne experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.1 months, from October 24 to May 28, with average wind speeds of more than 3.6 miles per hour. The windiest day of the year is December 1, with an average hourly wind speed of 4.2 miles per hour.

The calmer time of year lasts for 4.9 months, from May 28 to October 24. The calmest day of the year is August 12, with an average hourly wind speed of 3.0 miles per hour.

Average Wind Speed

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 Terrebonne varies throughout the year.

The wind is most often from the west for 7.4 months, from March 7 to October 18, with a peak percentage of 57% on June 8. The wind is most often from the south for 4.6 months, from October 18 to March 7, with a peak percentage of 57% on January 1.

Wind Direction

Wind Direction in TerrebonneSWS0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 3.4 months, from May 13 to August 24, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest day of the year is July 2, with an average of 7.9 kWh.

The darker period of the year lasts for 3.6 months, from October 28 to February 17, with an average daily incident shortwave energy per square meter below 2.8 kWh. The darkest day of the year is December 16, with an average of 1.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Terrebonnebrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJanFebMarAprMayJunJulAugSepOctNovDecJul 27.9 kWhJul 27.9 kWhDec 161.5 kWhDec 161.5 kWhMay 136.6 kWhMay 136.6 kWhAug 246.6 kWhAug 246.6 kWhOct 282.8 kWhOct 282.8 kWhFeb 172.8 kWhFeb 172.8 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 Terrebonne are 44.353 deg latitude, -121.178 deg longitude, and 2,808 ft elevation.

The topography within 2 miles of Terrebonne contains significant variations in elevation, with a maximum elevation change of 522 feet and an average elevation above sea level of 2,823 feet. Within 10 miles contains significant variations in elevation (2,995 feet). Within 50 miles contains large variations in elevation (9,334 feet).

The area within 2 miles of Terrebonne is covered by cropland (58%) and shrubs (30%), within 10 miles by shrubs (78%) and cropland (17%), and within 50 miles by shrubs (62%) and trees (33%).

Data Sources

This report illustrates the typical weather in Terrebonne, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Terrebonne.

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

The stations contributing to this reconstruction are: Roberts Field-Redmond Municipal Airport (92%, 11 kilometers, south); The Dalles Municipal Airport (2.3%, 141 kilometers, north); McNary Field (2.1%, 157 kilometers, northwest); Aurora State Airport (2.0%, 160 kilometers, northwest); and Portland–Troutdale Airport (1.9%, 165 kilometers, northwest).

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.