Climate and Average Weather Year Round in Tillamook Oregon, United States

In Tillamook, the summers are comfortable, dry, and mostly clear and the winters are cold, wet, and overcast. Over the course of the year, the temperature typically varies from 39°F to 71°F and is rarely below 30°F or above 79°F.

Based on the tourism score, the best time of year to visit Tillamook for warm-weather activities is from early July to late August.

The warm season lasts for 3.3 months, from June 25 to October 1, with an average daily high temperature above 67°F. The hottest day of the year is August 18, with an average high of 71°F and low of 53°F.

The cool season lasts for 3.0 months, from November 21 to February 22, with an average daily high temperature below 55°F. The coldest day of the year is December 19, with an average low of 39°F and high of 51°F.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

La Ensenada, Chile (6,780 miles away) and New Norfolk, Australia (8,191 miles) are the far-away foreign places with temperatures most similar to Tillamook (view comparison).

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In Tillamook, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Tillamook begins around June 14 and lasts for 3.8 months, ending around October 7. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 79% of the time, and overcast or mostly cloudy 21% of the time.

The cloudier part of the year begins around October 7 and lasts for 8.2 months, ending around June 14. On January 9, the cloudiest day of the year, the sky is overcast or mostly cloudy 76% of the time, and clear, mostly clear, or partly cloudy 24% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Tillamook varies very significantly throughout the year.

The wetter season lasts 6.5 months, from October 13 to April 27, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 59% on November 17.

The drier season lasts 5.5 months, from April 27 to October 13. The smallest chance of a wet day is 5% on August 3.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 58% on November 17.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Tillamook experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 11 months, from August 16 to July 15, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 30, with an average total accumulation of 10.7 inches.

The rainless period of the year lasts for 1.0 months, from July 15 to August 16. The least rain falls around July 29, with an average total accumulation of 0.3 inches.

The length of the day in Tillamook varies significantly over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 43 minutes of daylight; the longest day is June 20, with 15 hours, 41 minutes of daylight.

The earliest sunrise is at 5:26 AM on June 15, and the latest sunrise is 2 hours, 36 minutes later at 8:02 AM on November 6. The earliest sunset is at 4:31 PM on December 9, and the latest sunset is 4 hours, 36 minutes later at 9:08 PM on June 26.

Daylight saving time (DST) is observed in Tillamook during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.

The figure below presents a compact representation of key lunar data for 2021. 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.

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 perceived humidity level in Tillamook, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

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 Tillamook experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.1 months, from October 27 to April 1, with average wind speeds of more than 7.6 miles per hour. The windiest day of the year is December 3, with an average hourly wind speed of 9.4 miles per hour.

The calmer time of year lasts for 6.8 months, from April 1 to October 27. The calmest day of the year is August 20, with an average hourly wind speed of 5.8 miles per hour.

The predominant average hourly wind direction in Tillamook varies throughout the year.

The wind is most often from the east for 6.0 days, from January 23 to January 29, with a peak percentage of 37% on January 26. The wind is most often from the south for 2.8 months, from January 29 to April 24 and for 3.3 months, from October 14 to January 23, with a peak percentage of 41% on February 27. The wind is most often from the north for 5.7 months, from April 24 to October 14, with a peak percentage of 66% on July 21.

Tillamook 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from June 17 to September 26, with an average temperature above 57°F. The day of the year with the warmest water is August 21, with an average temperature of 59°F.

The time of year with cooler water lasts for 4.3 months, from December 8 to April 19, with an average temperature below 51°F. The day of the year with the coolest water is February 14, with an average temperature of 49°F.

To characterize how pleasant the weather is in Tillamook throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Tillamook for general outdoor tourist activities is from early July to late August, with a peak score in the first week of August.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Tillamook for hot-weather activities is from late July to early September, with a peak score in the second week of August.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 Tillamook typically lasts for 7.8 months (239 days), from around March 22 to around November 17, rarely starting before February 19 or after April 21, and rarely ending before October 19 or after December 17.

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.

Based on growing degree days alone, the first spring blooms in Tillamook should appear around March 22, only rarely appearing before February 21 or after April 22.

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 2.9 months, from May 27 to August 24, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is July 16, with an average of 7.2 kWh.

The darker period of the year lasts for 4.0 months, from October 25 to February 24, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest day of the year is December 26, with an average of 1.0 kWh.

For the purposes of this report, the geographical coordinates of Tillamook are 45.456 deg latitude, -123.846 deg longitude, and 23 ft elevation.

The topography within 2 miles of Tillamook contains only modest variations in elevation, with a maximum elevation change of 207 feet and an average elevation above sea level of 16 feet. Within 10 miles contains only modest variations in elevation (3,156 feet). Within 50 miles contains large variations in elevation (3,655 feet).

The area within 2 miles of Tillamook is covered by cropland (59%) and herbaceous vegetation (33%), within 10 miles by trees (47%) and water (20%), and within 50 miles by water (42%) and trees (32%).