Climate of Tacoma, WA

Introduction

Tacoma, situated in Pierce County, Washington, is known for its mild and relatively stable climate. Its weather patterns are influenced by its geographical location, including its proximity to the Pacific Ocean, the Puget Sound, and the Cascade and Olympic mountain ranges. Understanding Tacoma’s climate provides valuable insights into the city’s weather patterns, seasonal changes, and environmental conditions.

Climate Classification

Köppen Climate Classification

Tacoma’s climate is classified under the Köppen climate classification system as a temperate maritime climate (Csb). This classification is characterized by mild, wet winters and warm, dry summers.

Characteristics of Csb Climate

• Mild Winters: Winters are relatively mild compared to other regions at similar latitudes.
• Warm Summers: Summers are warm but not excessively hot.
• Moderate Precipitation: The region experiences moderate to heavy precipitation throughout the year.

Climate Zones

Tacoma falls within the temperate maritime climate zone, which is influenced by oceanic conditions and nearby mountain ranges.

Coastal Influence

The proximity to the Pacific Ocean and Puget Sound contributes to the moderate climate, with relatively small temperature fluctuations between seasons.

Mountain Range Influence

The surrounding mountain ranges, including the Cascades and Olympics, impact local weather patterns by affecting precipitation and temperature.

Temperature

Annual Temperature Overview

Tacoma experiences mild temperatures year-round, with moderate seasonal variations. The city enjoys a temperate climate due to its maritime influence.

Average Annual Temperatures

• Average Highs: Typically range from 45°F (7°C) in winter to 75°F (24°C) in summer.
• Average Lows: Typically range from 35°F (2°C) in winter to 55°F (13°C) in summer.

Seasonal Temperature Patterns

Tacoma’s temperature patterns exhibit moderate seasonal variations, with distinct differences between summer and winter.

Spring

Spring temperatures gradually warm from the cooler winter months, with average highs reaching around 55°F (13°C) and lows around 40°F (4°C). Spring is characterized by increasing daylight and blooming flora.

Summer

Summers in Tacoma are warm but not excessively hot. Average high temperatures reach approximately 75°F (24°C), with lows around 55°F (13°C). The summer months are typically dry and sunny.

Fall

Fall temperatures decrease from the summer highs, with average highs around 60°F (15°C) and lows around 45°F (7°C). Fall is marked by changing foliage and increased rainfall.

Winter

Winters in Tacoma are mild compared to many other locations. Average highs are around 45°F (7°C), and lows are around 35°F (2°C). Winter weather is generally wet, with frequent rainfall.

Extreme Temperature Records

Tacoma has experienced a range of extreme temperatures throughout its history.

Highest Temperature Recorded

• Record High: 102°F (39°C)

Lowest Temperature Recorded

• Record Low: 0°F (-18°C)

Precipitation

Annual Precipitation Overview

Tacoma receives a significant amount of precipitation annually, contributing to its lush and green environment. The city experiences rainfall throughout the year.

Average Annual Rainfall

• Total Precipitation: Approximately 37 inches (940 mm) annually.

Monthly Precipitation Patterns

Tacoma’s precipitation is relatively evenly distributed throughout the year, with some variation between seasons.

Snowfall

Snowfall in Tacoma is relatively infrequent but can occur during the winter months.

Average Annual Snowfall

• Total Snowfall: Approximately 10 inches (254 mm) annually.

Snowfall Patterns

• Typical Snowfall Months: December through February.
• Highest Monthly Snowfall: January, averaging 4 inches (102 mm).

Seasonal Variations

Spring

Spring in Tacoma is a transitional season characterized by gradually warming temperatures and increasing daylight. Rainfall decreases compared to winter, and the city experiences blooming flowers and greenery.

Summer

Summer brings warmer temperatures and drier conditions. The period is marked by long, sunny days and mild evenings. Summer is the peak tourist season, with various outdoor activities and festivals.

Fall

Fall features cooler temperatures and increased rainfall. The changing leaves provide picturesque views, and the weather becomes progressively wetter as the season progresses.

Winter

Winter in Tacoma is mild compared to other regions. The city experiences frequent rainfall, with occasional snowfall. Winter temperatures are generally above freezing, but colder spells can occur.

Climatic Influences

Proximity to Puget Sound

Tacoma’s location along the Puget Sound has a moderating effect on its climate. The large body of water helps to moderate temperature fluctuations, keeping winters milder and summers cooler.

Mountain Ranges

The Cascade and Olympic mountain ranges play a significant role in Tacoma’s climate by influencing precipitation patterns and temperature variations. The mountains create a rain shadow effect and contribute to the city’s rainfall distribution.

Oceanic Influence

The Pacific Ocean exerts a moderating influence on Tacoma’s climate, leading to its mild temperatures and significant precipitation. Ocean currents and prevailing winds help shape the local weather patterns.

Climate Data and Trends

Historical Climate Data

Tacoma has a well-documented climate history, with long-term data showing consistent temperature and precipitation patterns. Historical data indicates moderate fluctuations and trends over the years.

Climate Change Impacts

Tacoma, like many other regions, is experiencing the effects of climate change. Trends include increasing temperatures, shifting precipitation patterns, and more frequent extreme weather events.

Observed Changes

• Temperature Increases: Gradual warming of average temperatures.
• Precipitation Patterns: Changes in the timing and intensity of rainfall.

Future Projections

Future projections indicate potential increases in temperature, changes in precipitation patterns, and impacts on local ecosystems and water resources.

Conclusion

Tacoma’s climate is characterized by its temperate maritime conditions, with mild temperatures and significant precipitation throughout the year. The city’s climate is influenced by its geographical location, including its proximity to Puget Sound, surrounding mountain ranges, and oceanic factors. Understanding Tacoma’s climate provides valuable insights into its weather patterns, seasonal variations, and the impacts of climatic changes. The moderate climate contributes to Tacoma’s lush environment and supports a variety of outdoor activities and community events throughout the year.