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Average Weather in Sweet Home Oregon, United States

In Sweet Home, the summers are short, warm, dry, and mostly clear and the winters are very cold, wet, and overcast. Over the course of the year, the temperature typically varies from 35°F to 87°F and is rarely below 25°F or above 98°F.

Based on the tourism score, the best time of year to visit Sweet Home for warm-weather activities is from early July to late August.

Climate Summary

coldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec82%82%23%23%clearovercastprecipitation: 9.6 inprecipitation: 9.6 in0.4 in0.4 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 7.0tourism score: 7.00.10.1
Click on each chart for more information.

Temperature

The hot season lasts for 2.7 months, from June 29 to September 18, with an average daily high temperature above 79°F. The hottest day of the year is August 4, with an average high of 87°F and low of 56°F.

The cool season lasts for 3.6 months, from November 11 to February 28, with an average daily high temperature below 53°F. The coldest day of the year is December 23, with an average low of 35°F and high of 45°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 Sweet HomeJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery 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.

Baños de Río Tobía, Spain (5,398 miles away) is the far-away foreign place with temperatures most similar to Sweet Home (view comparison).

Clouds

In Sweet Home, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Sweet Home begins around June 13 and lasts for 3.8 months, ending around October 8. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 82% of the time, and overcast or mostly cloudy 18% of the time.

The cloudier part of the year begins around October 8 and lasts for 8.2 months, ending around June 13. On November 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 77% of the time, and clear, mostly clear, or partly cloudy 23% of the time.

Cloud Cover Categories

Cloud Cover Categories in Sweet HomeclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Aug 382%Aug 382%Nov 3023%Nov 3023%Jun 1352%Jun 1352%Oct 853%Oct 853%clearmostly cloudyovercastpartly 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 Sweet Home varies very significantly throughout the year.

The wetter season lasts 7.5 months, from October 13 to May 30, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 59% on November 28.

The drier season lasts 4.5 months, from May 30 to October 13. The smallest chance of a wet day is 4% on August 4.

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 57% on November 28.

Daily Chance of Precipitation

Daily Chance of Precipitation in Sweet HomewetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 2859%Nov 2859%Aug 44%Aug 44%Oct 1332%Oct 1332%May 3032%May 3032%rainmixed
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. Sweet Home experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 11 months, from August 17 to July 19, 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 9.5 inches.

The rainless period of the year lasts for 4.1 weeks, from July 19 to August 17. The least rain falls around August 1, with an average total accumulation of 0.4 inches.

Average Monthly Rainfall

Average Monthly Rainfall in Sweet HomerainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in5 in10 in15 inDec 29.5 inDec 29.5 inAug 10.4 inAug 10.4 in
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

The sliding 31-day liquid-equivalent quantity of snowfall in Sweet Home does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in Sweet HomesnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 inDec 290.2 inDec 290.2 inJul 210.0 inJul 210.0 inFeb 180.1 inFeb 180.1 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 Sweet Home varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 50 minutes of daylight; the longest day is June 21, with 15 hours, 32 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in Sweet HomeJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 32 minJun 2115 hr, 32 minJun 2112 hr, 10 minSep 2212 hr, 10 minSep 228 hr, 50 minDec 218 hr, 50 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 5:25 AM on June 15, and the latest sunrise is 2 hours, 25 minutes later at 7:51 AM on November 3. The earliest sunset is at 4:31 PM on December 10, and the latest sunset is 4 hours, 28 minutes later at 8:59 PM on June 26.

Daylight saving time (DST) is observed in Sweet Home 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 Sweet HomeJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:25 AMJun 155:25 AM8:59 PMJun 268:59 PMJun 26Dec 104:31 PMDec 104:31 PM7:51 AMNov 37:51 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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 Sweet Home, 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 Sweet HomeJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 150%Dec 150%Jul 70%Jul 70%drydrycomfortablecomfortable
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 Sweet Home experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.9 months, from November 1 to March 29, with average wind speeds of more than 4.5 miles per hour. The windiest day of the year is December 3, with an average hourly wind speed of 5.3 miles per hour.

The calmer time of year lasts for 7.1 months, from March 29 to November 1. The calmest day of the year is August 1, with an average hourly wind speed of 3.8 miles per hour.

Average Wind Speed

Average Wind Speed in Sweet HomewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mphDec 35.3 mphDec 35.3 mphAug 13.8 mphAug 13.8 mphMar 294.5 mphMar 294.5 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 Sweet Home varies throughout the year.

The wind is most often from the west for 2.7 months, from April 7 to June 27 and for 5.0 days, from September 4 to September 9, with a peak percentage of 45% on May 28. The wind is most often from the north for 2.2 months, from June 27 to September 4 and for 3.1 weeks, from September 9 to October 1, with a peak percentage of 49% on July 21. The wind is most often from the south for 6.2 months, from October 1 to April 7, with a peak percentage of 50% on January 1.

Wind Direction

Wind Direction in Sweet HomeSWNNSJanFebMarAprMayJunJulAugSepOctNovDec0%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 Sweet Home 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 Sweet Home for general outdoor tourist activities is from early July to late August, with a peak score in the last week of July.

Tourism Score

Tourism Score in Sweet HomeJanFebMarAprMayJunJulAugSepOctNovDec02468107.07.00.10.1 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 Sweet Home 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 Sweet HomeJanFebMarAprMayJunJulAugSepOctNovDec02468103.23.20.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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

The growing season in Sweet Home typically lasts for 6.6 months (200 days), from around April 17 to around November 3, rarely starting before March 17 or after May 10, and rarely ending before October 10 or after December 4.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Sweet Homegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1750%Apr 1750%Nov 350%Nov 390%May 1090%May 1090%Oct 1090%Oct 1010%Mar 1710%Mar 1710%Dec 410%Dec 4Jul 25100%Jul 25100%freezingvery coldcoldcoolcomfortablewarmhot
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 Sweet Home should appear around April 6, only rarely appearing before March 17 or after April 24.

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 2.8 months, from June 1 to August 25, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest day of the year is July 16, with an average of 7.5 kWh.

The darker period of the year lasts for 3.9 months, from October 26 to February 23, with an average daily incident shortwave energy per square meter below 2.4 kWh. The darkest day of the year is December 26, with an average of 1.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Sweet HomebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJul 167.5 kWhJul 167.5 kWhDec 261.1 kWhDec 261.1 kWhJun 16.2 kWhJun 16.2 kWhOct 262.4 kWhOct 262.4 kWhFeb 232.4 kWhFeb 232.4 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 Sweet Home are 44.398 deg latitude, -122.736 deg longitude, and 778 ft elevation.

The topography within 2 miles of Sweet Home contains significant variations in elevation, with a maximum elevation change of 646 feet and an average elevation above sea level of 690 feet. Within 10 miles contains significant variations in elevation (3,547 feet). Within 50 miles also contains extreme variations in elevation (9,583 feet).

The area within 2 miles of Sweet Home is covered by cropland (52%), trees (19%), shrubs (17%), and artificial surfaces (11%), within 10 miles by shrubs (44%) and trees (34%), and within 50 miles by trees (53%) and cropland (23%).

Data Sources

This report illustrates the typical weather in Sweet Home, 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 Sweet Home.

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

The stations contributing to this reconstruction are: Corvallis Municipal Airport (34%, 45 kilometers, west); Mahlon Sweet Field Airport (31%, 49 kilometers, southwest); McNary Field (23%, 60 kilometers, north); Bend Municipal Airport (6%, 127 kilometers, east); and Roberts Field-Redmond Municipal Airport (6%, 128 kilometers, east).

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.