Average Weather in July in Heppner Oregon, United States
Daily high temperatures increase by 5°F, from 81°F to 87°F, rarely falling below 70°F or exceeding 95°F.
Daily low temperatures increase by 4°F, from 53°F to 56°F, rarely falling below 45°F or exceeding 63°F. The highest daily average low temperature is 56°F on July 31.
For reference, on July 31, the hottest day of the year, temperatures in Heppner typically range from 56°F to 87°F, while on December 23, the coldest day of the year, they range from 26°F to 37°F.
Average High and Low Temperature in July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July
Las Navas del Marqués, Spain (5,282 miles away); Sarajevo, Bosnia & Herzegovina (5,761 miles); and Aydıncık, Turkey (6,336 miles) are the far-away foreign places with temperatures most similar to Heppner (view comparison).
The month of July in Heppner experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 27% to 17%. The lowest chance of overcast or mostly cloudy conditions is 16% on July 29.
The clearest day of the month is July 29, with clear, mostly clear, or partly cloudy conditions 84% of the time.
For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 64%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 84%.
Cloud Cover Categories in July
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Heppner, the chance of a wet day over the course of July is gradually decreasing, starting the month at 8% and ending it at 5%.
For reference, the year's highest daily chance of a wet day is 24% on November 28, and its lowest chance is 5% on August 5.
Probability of Precipitation in July
The average sliding 31-day rainfall during July in Heppner is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 0.9 inches.
The lowest average 31-day accumulation is 0.2 inches on July 28.
Average Monthly Rainfall in July
Over the course of July in Heppner, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 50 minutes, implying an average daily decrease of 1 minute, 41 seconds, and weekly decrease of 11 minutes, 47 seconds.
The shortest day of the month is July 31, with 14 hours, 45 minutes of daylight and the longest day is July 1, with 15 hours, 36 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in Heppner is 5:14 AM on July 1 and the latest sunrise is 27 minutes later at 5:41 AM on July 31.
The latest sunset is 8:49 PM on July 1 and the earliest sunset is 23 minutes earlier at 8:26 PM on July 31.
Daylight saving time is observed in Heppner during 2018, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:10 AM and sets 15 hours, 40 minutes later, at 8:50 PM, while on December 21, the shortest day of the year, it rises at 7:34 AM and sets 8 hours, 43 minutes later, at 4:18 PM.
Sunrise & Sunset with Twilight in July
The chance that a given day will be muggy in Heppner is essentially constant during July, remaining around 0% throughout.
For reference, on August 24, 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 July
The average hourly wind speed in Heppner is essentially constant during July, remaining within 0.2 miles per hour of 8.2 miles per hour throughout.
For reference, on December 1, the windiest day of the year, the daily average wind speed is 10.0 miles per hour, while on September 9, the calmest day of the year, the daily average wind speed is 7.4 miles per hour.
Average Wind Speed in July
Wind Direction in July
The growing season in Heppner typically lasts for 5.5 months (167 days), from around April 29 to around October 13, rarely starting before April 6 or after May 19, and rarely ending before September 23 or after November 1.
The month of July in Heppner is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
The average accumulated growing degree days in Heppner are rapidly increasing during July, increasing by 564°F, from 729°F to 1,292°F, over the course of the month.
Growing Degree Days in July
The average daily incident shortwave solar energy in Heppner is essentially constant during July, remaining within 0.2 kWh of 7.7 kWh throughout.
The highest average daily incident shortwave solar energy during July is 7.8 kWh on July 13.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Heppner are 45.353 deg latitude, -119.558 deg longitude, and 2,425 ft elevation.
The topography within 2 miles of Heppner contains very significant variations in elevation, with a maximum elevation change of 951 feet and an average elevation above sea level of 2,291 feet. Within 10 miles contains very significant variations in elevation (2,598 feet). Within 50 miles contains large variations in elevation (6,010 feet).
The area within 2 miles of Heppner is covered by shrubs (91%), within 10 miles by shrubs (78%) and grassland (17%), and within 50 miles by shrubs (71%) and cropland (15%).
This report illustrates the typical weather in Heppner 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Heppner.
For each station, the records are corrected for the elevation difference between that station and Heppner 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 Heppner is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Heppner and a given station.
The stations contributing to this reconstruction are: Hermiston Municipal Airport (30%, 57 kilometers, northeast); Eastern Oregon Regional Airport (34%, 67 kilometers, northeast); John Day State Airport (16%, 116 kilometers, southeast); The Dalles Municipal Airport (12%, 129 kilometers, west); and Roberts Field-Redmond Municipal Airport (9%, 175 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .