Winter Weather in New Hope Oregon, United States

Daily high temperatures increase by 6°F, from 50°F to 56°F, rarely falling below 40°F or exceeding 65°F. The lowest daily average high temperature is 48°F on December 26.

Daily low temperatures are around 37°F, rarely falling below 28°F or exceeding 46°F. The lowest daily average low temperature is 36°F on December 23.

For reference, on August 4, the hottest day of the year, temperatures in New Hope typically range from 59°F to 89°F, while on December 23, the coldest day of the year, they range from 36°F to 48°F.

The figure below shows you a compact characterization of the hourly average winter temperatures. 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.

Villaralbo, Spain (5,471 miles away) is the far-away foreign place with temperatures most similar to New Hope (view comparison).

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The winter in New Hope experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 70% throughout the season. The highest chance of overcast or mostly cloudy conditions is 73% on December 1.

The clearest day of the winter is January 31, with clear, mostly clear, or partly cloudy conditions 32% of the time.

For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 87%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In New Hope, the chance of a wet day over the course of the winter is decreasing, starting the season at 51% and ending it at 46%.

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.

Over the course of the winter in New Hope, the chance of a day with only rain decreases from 50% to 46%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in New Hope is very rapidly decreasing, starting the season at 8.3 inches, when it rarely exceeds 14.8 inches or falls below 3.0 inches, and ending the season at 5.8 inches, when it rarely exceeds 10.4 inches or falls below 1.9 inches.

The highest average 31-day accumulation is 8.5 inches on December 8.

Over the course of the winter in New Hope, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 54 minutes, implying an average daily increase of 1 minute, 17 seconds, and weekly increase of 8 minutes, 58 seconds.

The shortest day of the winter is December 21, with 9 hours, 5 minutes of daylight and the longest day is February 28, with 11 hours, 12 minutes of daylight.

The latest sunrise of the winter in New Hope is 7:42 AM on January 2 and the earliest sunrise is 53 minutes earlier at 6:50 AM on February 28.

The earliest sunset is 4:40 PM on December 8 and the latest sunset is 1 hour, 22 minutes later at 6:02 PM on February 28.

Daylight saving time is observed in New Hope during 2025, but it neither starts nor ends during the winter, so the entire season is in standard time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:36 AM and sets 15 hours, 17 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, 5 minutes later, at 4:44 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the winter of 2025. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 New Hope is essentially constant during the winter, remaining around 0% throughout.

For reference, on July 18, 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.

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 New Hope is essentially constant during the winter, remaining within 0.2 miles per hour of 4.4 miles per hour throughout.

For reference, on December 15, the windiest day of the year, the daily average wind speed is 4.5 miles per hour, while on May 20, the calmest day of the year, the daily average wind speed is 3.6 miles per hour.

The highest daily average wind speed during the winter is 4.5 miles per hour on December 15.

The hourly average wind direction in New Hope throughout the winter is predominantly from the south, with a peak proportion of 48% on December 1.

New Hope 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 New Hope is essentially constant during the winter, remaining within 1°F of 52°F throughout.

The lowest average surface water temperature during the winter is 51°F on February 18.

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 New Hope typically lasts for 7.7 months (236 days), from around March 23 to around November 14, rarely starting before February 17 or after April 17, and rarely ending before October 25 or after December 5.

The winter in New Hope is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of 0% on January 12.

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 New Hope are very rapidly decreasing during the winter, decreasing by 2,870°F, from 2,914°F to 44°F, over the course of the season.

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 New Hope is increasing during the winter, rising by 1.5 kWh, from 1.5 kWh to 3.0 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 1.4 kWh on December 26.

For the purposes of this report, the geographical coordinates of New Hope are 42.362 deg latitude, -123.368 deg longitude, and 1,043 ft elevation.

The topography within 2 miles of New Hope contains very significant variations in elevation, with a maximum elevation change of 1,526 feet and an average elevation above sea level of 1,231 feet. Within 10 miles contains very significant variations in elevation (4,380 feet). Within 50 miles also contains extreme variations in elevation (7,457 feet).

The area within 2 miles of New Hope is covered by shrubs (81%) and cropland (14%), within 10 miles by shrubs (49%) and trees (38%), and within 50 miles by trees (57%) and shrubs (39%).