Average Weather in October in West Haven-Sylvan Oregon, United States
Daily high temperatures decrease by 13°F, from 70°F to 57°F, rarely falling below 50°F or exceeding 81°F.
Daily low temperatures decrease by 5°F, from 48°F to 43°F, rarely falling below 34°F or exceeding 56°F.
For reference, on August 3, the hottest day of the year, temperatures in West Haven-Sylvan typically range from 56°F to 83°F, while on December 30, the coldest day of the year, they range from 35°F to 44°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. The horizontal axis is the day, 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 October
The month of October in West Haven-Sylvan experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 43% to 64%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 57% of the time.
For reference, on January 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%.
Cloud Cover Categories in October
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In West Haven-Sylvan, the chance of a wet day over the course of October is very rapidly increasing, starting the month at 25% and ending it at 48%.
For reference, the year's highest daily chance of a wet day is 58% on November 27, and its lowest chance is 4% on August 3.
Probability of Precipitation in October
The average sliding 31-day rainfall during October in West Haven-Sylvan is very rapidly increasing, starting the month at 2.8 inches, when it rarely exceeds 5.5 inches or falls below 0.5 inches, and ending the month at 6.8 inches, when it rarely exceeds 11.1 inches or falls below 2.8 inches.
Average Monthly Rainfall in October
Over the course of October in West Haven-Sylvan, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 32 minutes, implying an average daily decrease of 3 minutes, 3 seconds, and weekly decrease of 21 minutes, 23 seconds.
The shortest day of the month is October 31, with 10 hours, 10 minutes of daylight and the longest day is October 1, with 11 hours, 42 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in West Haven-Sylvan is 7:09 AM on October 1 and the latest sunrise is 40 minutes later at 7:49 AM on October 31.
The latest sunset is 6:51 PM on October 1 and the earliest sunset is 52 minutes earlier at 5:59 PM on October 31.
Daylight saving time is observed in West Haven-Sylvan during 2018, but it neither starts nor ends during October, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:22 AM and sets 15 hours, 41 minutes later, at 9:03 PM, while on December 21, the shortest day of the year, it rises at 7:48 AM and sets 8 hours, 42 minutes later, at 4:30 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
The chance that a given day will be muggy in West Haven-Sylvan is essentially constant during October, remaining around 0% throughout.
For reference, on August 6, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in October
The average hourly wind speed in West Haven-Sylvan is gradually increasing during October, increasing from 4.6 miles per hour to 5.2 miles per hour over the course of the month.
For reference, on December 3, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on August 23, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.
Average Wind Speed in October
Wind Direction in October
West Haven-Sylvan is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in West Haven-Sylvan is gradually decreasing during October, falling by 3°F, from 56°F to 54°F, over the course of the month.
Average Water Temperature in October
The growing season in West Haven-Sylvan typically lasts for 7.6 months (232 days), from around March 25 to around November 12, rarely starting before February 22 or after April 21, and rarely ending before October 20 or after December 6.
The month of October in West Haven-Sylvan is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 99% to 73% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October
The average accumulated growing degree days in West Haven-Sylvan are gradually increasing during October, increasing by 151°F, from 2,081°F to 2,232°F, over the course of the month.
Growing Degree Days in October
The average daily incident shortwave solar energy in West Haven-Sylvan is rapidly decreasing during October, falling by 1.8 kWh, from 3.8 kWh to 2.0 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of West Haven-Sylvan are 45.516 deg latitude, -122.768 deg longitude, and 413 ft elevation.
The topography within 2 miles of West Haven-Sylvan contains very significant variations in elevation, with a maximum elevation change of 1,066 feet and an average elevation above sea level of 548 feet. Within 10 miles also contains very significant variations in elevation (1,253 feet). Within 50 miles contains very significant variations in elevation (5,213 feet).
The area within 2 miles of West Haven-Sylvan is covered by artificial surfaces (65%) and trees (31%), within 10 miles by artificial surfaces (57%) and cropland (17%), and within 50 miles by trees (47%) and cropland (21%).
This report illustrates the typical weather in West Haven-Sylvan year round, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in West Haven-Sylvan.
For each station, the records are corrected for the elevation difference between that station and West Haven-Sylvan 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 West Haven-Sylvan is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between West Haven-Sylvan and a given station.
The stations contributing to this reconstruction are: Portland-Hillsboro Airport (35%, 14 kilometers, west); Pearson Airpark (27%, 15 kilometers, northeast); Portland International Airport (25%, 15 kilometers, northeast); and Aurora State Airport (13%, 30 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .