Average Weather in July in Eureka Nevada, United States
Daily high temperatures are around 83°F, rarely falling below 73°F or exceeding 92°F. The highest daily average high temperature is 84°F on July 22.
Daily low temperatures increase by 3°F, from 48°F to 52°F, rarely falling below 40°F or exceeding 59°F. The highest daily average low temperature is 52°F on July 23.
For reference, on July 21, the hottest day of the year, temperatures in Eureka typically range from 52°F to 84°F, while on December 29, the coldest day of the year, they range from 14°F to 34°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
The month of July in Eureka experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 18% throughout the month.
The clearest day of the month is July 31, with clear, mostly clear, or partly cloudy conditions 83% of the time.
For reference, on February 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 50%, while on August 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 84%.
Cloud Cover Categories in July
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Eureka, the chance of a wet day over the course of July is increasing, starting the month at 5% and ending it at 10%.
For reference, the year's highest daily chance of a wet day is 16% on May 5, and its lowest chance is 5% on June 29.
Probability of Precipitation in July
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during July in Eureka is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 0.9 inches.
The lowest average 31-day accumulation is 0.3 inches on July 3.
Average Monthly Rainfall in July
Over the course of July in Eureka, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 41 minutes, implying an average daily decrease of 1 minute, 21 seconds, and weekly decrease of 9 minutes, 29 seconds.
The shortest day of the month is July 31, with 14 hours, 14 minutes of daylight and the longest day is July 1, with 14 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in Eureka is 5:20 AM on July 1 and the latest sunrise is 22 minutes later at 5:43 AM on July 31.
The latest sunset is 8:14 PM on July 1 and the earliest sunset is 18 minutes earlier at 7:56 PM on July 31.
Daylight saving time is observed in Eureka during 2020, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 20, the longest day of the year, the Sun rises at 5:16 AM and sets 14 hours, 58 minutes later, at 8:14 PM, while on December 21, the shortest day of the year, it rises at 7:00 AM and sets 9 hours, 23 minutes later, at 4:23 PM.
Sunrise & Sunset with Twilight in July
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 chance that a given day will be muggy in Eureka is essentially constant during July, remaining around 0% throughout.
Humidity Comfort Levels in July
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Eureka is gradually decreasing during July, decreasing from 7.7 miles per hour to 7.2 miles per hour over the course of the month.
For reference, on April 7, the windiest day of the year, the daily average wind speed is 9.5 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 7.2 miles per hour.
Average Wind Speed in July
The hourly average wind direction in Eureka throughout July is predominantly from the south, with a peak proportion of 44% on July 30.
Wind Direction in July
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 Eureka typically lasts for 3.2 months (98 days), from around June 10 to around September 16, rarely starting before May 23 or after June 27, and rarely ending before August 28 or after October 6.
The month of July in Eureka is very likely fully within the growing season, with the chance that a given day is in the growing season reaching a high of 100% on July 19.
Time Spent in Various Temperature Bands and the Growing Season in July
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.
The average accumulated growing degree days in Eureka are rapidly increasing during July, increasing by 538°F, from 622°F to 1,160°F, over the course of the month.
Growing Degree Days in July
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 in Eureka is gradually decreasing during July, falling by 0.7 kWh, from 8.5 kWh to 7.8 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Eureka are 39.513 deg latitude, -115.961 deg longitude, and 6,726 ft elevation.
The topography within 2 miles of Eureka contains large variations in elevation, with a maximum elevation change of 2,057 feet and an average elevation above sea level of 6,851 feet. Within 10 miles contains large variations in elevation (4,659 feet). Within 50 miles also contains extreme variations in elevation (6,027 feet).
The area within 2 miles of Eureka is covered by shrubs (99%), within 10 miles by shrubs (84%) and trees (12%), and within 50 miles by shrubs (86%) and trees (11%).
This report illustrates the typical weather in Eureka 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Eureka.
For each station, the records are corrected for the elevation difference between that station and Eureka 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 Eureka is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Eureka and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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.