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Average Weather in April in Grants Pass Oregon, United States

In Grants Pass, the month of April is characterized by rising daily high temperatures, with daily highs increasing by 7°F, from 61°F to 68°F over the course of the month, and rarely exceeding 81°F or dropping below 50°F.

Daily low temperatures increase by 4°F, from 41°F to 45°F, rarely falling below 34°F or exceeding 52°F.

For reference, on August 3, the hottest day of the year, temperatures in Grants Pass typically range from 60°F to 90°F, while on December 23, the coldest day of the year, they range from 36°F to 48°F.

Average High and Low Temperature in April

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 hourly average temperatures for the quarter of the year centered on April. 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 April

Average Hourly Temperature in April in Grants Pass1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM4 AM8 AM12 PM4 PM8 PM12 AMMarMaycomfortablecoldcoolchilly
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

The month of April in Grants Pass experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 65% to 59%.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 41% of the time.

For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 87%.

Cloud Cover Categories in April

Cloud Cover Categories in April in Grants Pass181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 135%Apr 135%Apr 3041%Apr 3041%Apr 1136%Apr 1136%Apr 2138%Apr 2138%clearmostly clearpartly cloudyovercastmostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Grants Pass, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 40% and ending it at 26%.

For reference, the year's highest daily chance of a wet day is 52% on November 30, and its lowest chance is 2% on August 4.

Probability of Precipitation in April

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 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 April in Grants Pass is rapidly decreasing, starting the month at 4.2 inches, when it rarely exceeds 8.3 inches or falls below 1.4 inches, and ending the month at 2.3 inches, when it rarely exceeds 4.0 inches or falls below 0.7 inches.

Average Monthly Rainfall in April

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.

Sun

Over the course of April in Grants Pass, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 19 minutes, implying an average daily increase of 2 minutes, 43 seconds, and weekly increase of 18 minutes, 58 seconds.

The shortest day of the month is April 1, with 12 hours, 45 minutes of daylight and the longest day is April 30, with 14 hours, 3 minutes of daylight.

Hours of Daylight and Twilight in April

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 latest sunrise of the month in Grants Pass is 6:55 AM on April 1 and the earliest sunrise is 46 minutes earlier at 6:09 AM on April 30.

The earliest sunset is 7:39 PM on April 1 and the latest sunset is 33 minutes later at 8:12 PM on April 30.

Daylight saving time is observed in Grants Pass during 2017, but it neither starts nor ends during April, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:36 AM and sets 15 hours, 18 minutes later, at 8:54 PM, while on December 21, the shortest day of the year, it rises at 7:39 AM and sets 9 hours, 4 minutes later, at 4:43 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in April

The solar day over the course of April. 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.

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 chance that a given day will be muggy in Grants Pass is essentially constant during April, remaining around 0% throughout.

For reference, on July 9, 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 April

Humidity Comfort Levels in April in Grants Pass181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%10%20%30%40%50%60%70%80%90%100%MarMayApr 160%Apr 160%Apr 10%Apr 10%Apr 300%Apr 300%drydrycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Grants Pass is essentially constant during April, remaining within 0.1 miles per hour of 2.0 miles per hour throughout.

For reference, on December 15, the windiest day of the year, the daily average wind speed is 2.4 miles per hour, while on May 20, the calmest day of the year, the daily average wind speed is 2.0 miles per hour.

Average Wind Speed in April

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction in Grants Pass during April is predominantly out of the south from April 1 to April 11, the west from April 11 to April 20, and the north from April 20 to April 30.

Wind Direction in April

Wind Direction in April in Grants PassSWN181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMaynorthwestsoutheast
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Grants Pass 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 Grants Pass is essentially constant during April, remaining around 51°F throughout.

Average Water Temperature in April

The daily average water temperature (purple line), 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 in Grants Pass is increasing during April, rising by 1.3 kWh, from 4.5 kWh to 5.9 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April

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 Grants Pass are 42.439 deg latitude, -123.331 deg longitude, and 1,083 ft elevation.

The topography within 2 miles of Grants Pass contains very significant variations in elevation, with a maximum elevation change of 1,207 feet and an average elevation above sea level of 1,043 feet. Within 10 miles contains very significant variations in elevation (3,632 feet). Within 50 miles also contains extreme variations in elevation (7,428 feet).

The area within 2 miles of Grants Pass is covered by artificial surfaces (58%) and shrubs (31%), within 10 miles by shrubs (61%) and trees (26%), and within 50 miles by trees (56%) and shrubs (39%).

Data Sources

This report illustrates the typical weather in Grants Pass 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Grants Pass.

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

The stations contributing to this reconstruction are: Sexton Summit, (19%, 18 kilometers, north); Rogue Valley International - Medford Airport (63%, 38 kilometers, east); and Brookings Airport (18%, 89 kilometers, southwest).

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.