Average Weather For Grants Pass, Oregon, USA

Location

This report describes the typical weather at the Sexton Summit (Grants Pass, Oregon, United States) weather station over the course of an average year. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.

Grants Pass, Oregon has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by forests (98%).

Temperature

Over the course of a year, the temperature typically varies from 32°F to 76°F and is rarely below 24°F or above 86°F.

Daily High and Low Temperature

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The warm season lasts from June 28 to September 9 with an average daily high temperature above 69°F. The hottest day of the year is July 31, with an average high of 76°F and low of 55°F.

The cold season lasts from November 7 to April 6 with an average daily high temperature below 47°F. The coldest day of the year is December 28, with an average low of 32°F and high of 40°F.

Fraction of Time Spent in Various Temperature Bands

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

The length of the day varies significantly over the course of the year. The shortest day is December 21 with 9:03 hours of daylight; the longest day is June 20 with 15:20 hours of daylight.

Daily Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 5:35am on June 17 and the latest sunset is at 8:56pm on June 23. The latest sunrise is at 7:50am on November 3 and the earliest sunset is at 4:40pm on December 10.

Daylight saving time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.

Daily Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, 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.

Clouds

The median cloud cover ranges from 1% (clear) to 97% (overcast). The sky is cloudiest on March 15 and clearest on August 6. The clearer part of the year begins around June 2. The cloudier part of the year begins around October 21.

Median Cloud Cover

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On August 6, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 54% of the time, and overcast or mostly cloudy 11% of the time.

On March 15, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 47% of the time, and clear or mostly clear 18% of the time.

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around March 13, occurring in 57% of days. Precipitation is least likely around August 9, occurring in 13% of days.

Probability of Precipitation at Some Point in the Day

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Over the entire year, the most common forms of precipitation are light rain, light snow, moderate rain, and moderate snow.

Light rain is the most severe precipitation observed during 37% of those days with precipitation. It is most likely around May 21, when it is observed during 19% of all days.

Light snow is the most severe precipitation observed during 28% of those days with precipitation. It is most likely around March 13, when it is observed during 24% of all days.

Moderate rain is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around November 27, when it is observed during 10% of all days.

Moderate snow is the most severe precipitation observed during 10% of those days with precipitation. It is most likely around December 23, when it is observed during 9% of all days.

Types of Precipitation Throughout the Year

Relative frequency of various types of precipitation over the course of a typical year.

During the warm season, which lasts from June 28 to September 9, there is a 15% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (69% of days with precipitation have at worst light rain), moderate rain (14%), and thunderstorms (10%).

During the cold season, which lasts from November 7 to April 6, there is a 54% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light snow (36% of days with precipitation have at worst light snow), light rain (27%), moderate rain (15%), and moderate snow (14%).

Warm Season Precipitation

Cold Season Precipitation

Relative frequency of various types of precipitation during the warm and cold seasons respectively.

Snow

The likelihood of snow falling is highest around March 13, occurring in 36% of days. The season in which it is relatively likely for snow to fall spans from October 29 to May 16.

Probability of Snow Fall Being Reported in a Given Day

Probability that snow will be reported at least once in a given day. The season is defined as the period during which the probability is greater than one third the maximum probability.

Either snow rarely accumulates at this location or snow depth measurements are unavailable or unreliable.

Humidity

The relative humidity typically ranges from 36% (comfortable) to 93% (very humid) over the course of the year, rarely dropping below 18% (dry) and reaching as high as 100% (very humid).

The air is driest around August 4, at which time the relative humidity drops below 43% (comfortable) three days out of four; it is most humid around March 31, exceeding 91% (very humid) three days out of four.

Relative Humidity

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a year, the dew point typically varies from 21°F (dry) to 53°F (very comfortable) and is rarely below 9°F (dry) or above 58°F (comfortable).

The time of the year between July 5 and August 24 is the most comfortable, with dew points that are neither too dry nor too muggy.

Dew Point

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of the year typical wind speeds vary from 1 mph to 19 mph (light air to fresh breeze), rarely exceeding 27 mph (strong breeze).

The highest average wind speed of 12 mph (moderate breeze) occurs around January 3, at which time the average daily maximum wind speed is 19 mph (fresh breeze).

The lowest average wind speed of 8 mph (gentle breeze) occurs around May 14, at which time the average daily maximum wind speed is 15 mph (moderate breeze).

Wind Speed

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the north (23% of the time), south (19% of the time), and south east (14% of the time). The wind is least often out of the north east (2% of the time) and west (2% of the time).

Wind Directions Over the Entire Year

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.