Lena Torres
The climate of Puget Sound is influenced by the interaction between large-scale wind and weather patterns and the complex topography of the region. Seasonal changes in the movement of moisture-laden air that collides with the Olympic and Cascade mountains bring Puget Sound its famous record-breaking precipitation. The annual hot-cold cycle is apparent in the region, with the summertime daily minimum temperature increasing by about 4°C over the years. The warmest water temperature is in August, with an average of around 53.1°F / 11.7°C, while the coldest month is February, with an average water temperature of 45.3°F / 7.4°C.
| Characteristics | Values |
|---|---|
| Seasonal cycle | Cold water in winter, warm in summer |
| Annual hot-cold cycle | Visible in daily max and min temperature |
| Seasonal changes | Changes in the movement of moisture-laden air |
| Summer nights | Have gotten warmer by about 4 °C |
| Warming | Consistent with the warming of Puget Sound waters |
| Warm ocean waters | Work their way into Puget Sound |
| Warming contributors | Sunny summer, lower wind velocities, less mixing and cooling |
| Warming effects | Uncertain effects on Puget Sound |
| Warm water fish | Bluefin tuna, mackerel |
| August average water temperature | 58.3°F |
| Average water temperature in winter | 47.1°F |
| Average water temperature in spring | 48.9°F |
| Average water temperature in summer | 57°F |
| Average water temperature in autumn | 53.8°F |
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What You'll Learn
- Puget Sound's climate is influenced by large-scale wind and weather patterns
- Seasonal changes bring record-breaking precipitation
- The annual hot-cold cycle sees a gradual warming in summertime
- The warmest water temperature is in August
- The climate is influenced by the El Niño-Southern Oscillation (ENSO) cycle
Puget Sound's climate is influenced by large-scale wind and weather patterns
The climate of Puget Sound is influenced by the interaction between large-scale wind and weather patterns and the region's complex topography. Seasonal shifts in large-scale wind patterns cause the PNW's wet season, typically beginning in October, peaking in midwinter, and ending in the spring. About 75% of the region's annual precipitation falls during this period.
The climate of Puget Sound is significantly influenced by the Aleutian Low, a semi-permanent low-pressure cell that intensifies and migrates southeastward over the Aleutian Islands and the Gulf of Alaska around mid-October. The strength and location of the Aleutian Low pressure pattern undergo annual and decadal changes, which have a significant impact on the climate of the Pacific Northwest. An intense Aleutian Low brings relatively warm and dry winters to the region, while a weak Aleutian Low results in cooler and wetter winters.
The variability in the Aleutian Low is influenced by large-scale variations in sea-surface temperatures, known as the El Niño-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO). ENSO arises from interactions between tropical trade winds, ocean-surface temperatures, and currents near the equator in the Pacific. ENSO's warm phases, known as El Niño, are associated with an intense Aleutian Low, leading to warm and mild winters in Puget Sound. In contrast, La Niña, the cold phase of ENSO, results in cooler winters.
The PDO also influences the character of the Aleutian Low, with warm PDO periods characterised by warmer sea surface temperatures and cooler PDO periods associated with cooler sea surface temperatures. Changes in the PDO can have significant ecological impacts, such as changes in zooplankton, benthic algae, meso-crustaceans, rocky-reef fishes, and apex predators in the northeast Pacific Ocean.
In addition to the influence of the Aleutian Low and large-scale wind patterns, the complex topography of the region also plays a role in Puget Sound's climate. Seasonal changes in the movement of moisture-laden air that collides with the Olympic and Cascade mountains bring Puget Sound its record-breaking precipitation. These circulation and topographic differences lead to remarkable climate variations within Puget Sound, influencing the species and habitats found in the region.
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Seasonal changes bring record-breaking precipitation
The climate of Puget Sound is influenced by the interaction between large-scale wind and weather patterns and the complex topography of the region. Seasonal changes in the movement of moisture-laden air that collides with the Olympic and Cascade mountains bring about record-breaking precipitation. These circulation and topographic differences also lead to remarkable climate differences within Puget Sound, influencing the species and habitats found there.
The Pacific Northwest (PNW) wet season typically begins in October, peaks in midwinter, and ends in the spring. About 75% of the region's annual precipitation falls between October and March. The PNW average annual precipitation from 1961 to 1990 was 28.5 meters (94 feet) at Paradise Ranger Station on Mount Rainier. The Cascades are often among the snowiest places on Earth. In 1956, the snow piled up to a depth of 9.1 meters (30 feet) at Paradise, and the Mount Baker Ski Area set a new world record for the highest annual snowfall ever recorded from October 1998 to September 1999, with a total of 29 meters (96 feet).
The annual hot-cold cycle is apparent in the temperature data for Puget Sound, with a gradual warming trend. The summertime daily minimum temperature has increased by about 4 °C, indicating warmer nights. The warming trend is consistent with the warming of Puget Sound waters, which may be influenced by warmer air or larger-scale warming in the North Pacific, the source of water for the region.
The presence of El Niño, related to heat buildup in the tropics, can also impact the region. In 2013-2016, a strong El Niño event brought a huge patch of warm water, dubbed "the blob," to the Northwest coast and proceeded into Puget Sound. Unusually warm waters in the Pacific Ocean can have significant ecological impacts, potentially affecting fish, birds, and marine mammals in coastal waters and Puget Sound. For example, there have been sightings of warm-water fish not usually seen in the Northwest, like bluefin tuna and large schools of mackerel in the Strait of Juan de Fuca.
Seasonal changes in wind patterns also play a role in the climate of Puget Sound. During the summer, a cold upwelling, influenced by winds and coastal currents, is typical but declines in the fall. In the absence of this upwelling, warm water can swiftly enter Puget Sound, impacting the inland waterway. In September 2014, warmer seawater flowed into the Strait of Juan de Fuca, and within two weeks, temperatures throughout most of the Sound had increased by 1 to 2 degrees Celsius.
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The annual hot-cold cycle sees a gradual warming in summertime
The average water temperature in Puget Sound in the summer is 57°F, with a minimum of 54.3°F and a maximum of 63.5°F. August is the warmest month, with an average temperature of 58.3°F and a minimum of 54.3°F. The water temperature in Puget Sound does not rise above 68°F and is therefore not suitable for comfortable swimming.
The warming of Puget Sound waters is consistent with the warming of the North Pacific, which is the source of water for the Salish Sea and Puget Sound. The presence of El Niño, related to the heat buildup in the tropics, also contributes to the warming of the Pacific Ocean. Warmer conditions in the eastern Pacific, accompanied by lower wind velocities, result in less mixing and cooling, leading to warmer ocean surface temperatures.
The warm ocean waters work their way into Puget Sound, with smaller bays and inlets experiencing higher temperatures. The reduced freshwater flows, combined with normal wind and tide strengths, create a uniformity of slightly warmer water in the Sound. The absence of cold upwelling during the summer months allows warm water to enter Puget Sound more swiftly, impacting the inland waterway.
The warming of Puget Sound waters can have potential consequences for the ecosystem. Rising ocean temperatures may be related to the presence of warm-water fish not usually seen in the region, such as bluefin tuna and large schools of mackerel. Additionally, worrisome levels of domoic acid, a dangerous toxin produced by plankton, have been reported off the Oregon coast.
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The warmest water temperature is in August
The climate of Puget Sound is influenced by the interaction between large-scale wind and weather patterns and the complex topography of the region. Seasonal changes in the movement of moisture-laden air that collides with the Olympic and Cascade mountains bring Puget Sound its famous record-breaking precipitation.
The annual hot-cold cycle is apparent in the data, with a gradual warming trend over time. The summertime daily minimum temperature has increased by about 4 °C, indicating that nights have gotten warmer. This warming trend is consistent with the warming of Puget Sound waters.
The warmest water temperature in Puget Sound is typically reached in August, with an average of around 53.1°F / 11.7°C. The average August water temperature has also been recorded as 58.3°F, with a minimum of 54.3°F and a maximum of 63.5°F. This is in contrast to the average water temperature in the winter, which is 47.1°F, and in the spring, which is 48.9°F.
The warming of Puget Sound waters is influenced by various factors, including the warm waters of the Pacific Ocean, which can enter the Strait of Juan de Fuca. During periods of reduced freshwater flow, normal winds and tides can create a uniformity of slightly warmer water in the Sound. Warmer conditions in the Pacific Ocean, influenced by El Niño, can also contribute to the warming of Puget Sound waters.
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The climate is influenced by the El Niño-Southern Oscillation (ENSO) cycle
The climate in the Puget Sound region is influenced by the El Niño-Southern Oscillation (ENSO) cycle, a global climate phenomenon that impacts the tropics, subtropics, and higher-latitude regions. ENSO is characterised by variations in winds and sea surface temperatures over the tropical Pacific Ocean, resulting in irregular cycles of warming and cooling phases. The warming phase, known as El Niño, is associated with higher sea surface temperatures and weaker easterly trade winds, which can impact the Pacific Northwest and Puget Sound.
During El Niño events, the reduction in trade winds leads to a surge of warm surface waters towards the east, causing warmer sea surface temperatures. This can contribute to the warm conditions in the Pacific Ocean, affecting the climate of the Pacific Northwest and Puget Sound. Warmer ocean currents and lower wind velocities can result in less mixing and cooling of the ocean waters, leading to higher ocean temperatures. The presence of El Niño can also influence the weather patterns in the region, resulting in longer periods of sunny weather and reduced freshwater flows. These combined factors can lead to the warming of Puget Sound waters, with potential consequences for the local ecosystem and marine life.
On the other hand, the cooling phase of ENSO is known as La Niña. It is characterised by higher pressure over the central and eastern Pacific and lower pressure in the tropics and subtropics. La Niña events cause short-term surface cooling, which can influence global temperature trends over approximately ten-year timescales. The interaction between El Niño and La Niña, known as the Southern Oscillation, creates a coupled system of atmospheric and sea temperature changes. The Southern Oscillation is a key mechanism of ENSO, driving the feedback loop between atmospheric changes and sea temperatures.
The ENSO cycle is unpredictable, and its occurrence cannot be precisely determined. However, the strengthening of El Niño climate patterns suggests that regional ocean warming may become more intense. The warm waters in the Pacific Ocean, influenced by El Niño, can push against the Washington coast and impact the waters of Puget Sound. The complex interactions between winds, ocean currents, and atmospheric conditions during the ENSO cycle can have significant effects on the climate and ecosystem of the Puget Sound region.
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Frequently asked questions
Yes, the waters of Puget Sound are warmed by long days of sunny weather during the summer. The average water temperature in Puget Sound in the summer is 57°F, with the warmest month being August, with an average of 58.3°F.
Yes, there is evidence of a gradual warming trend in the summertime daily minimum temperatures, indicating that the nights are getting warmer. The presence of El Niño is predicted to contribute to warmer waters in the Northwest coast, which may impact Puget Sound.
The warm waters in Puget Sound during the summer are influenced by a combination of factors, including reduced freshwater flows, normal wind strengths, and the presence of warm waters from the Pacific Ocean. The interaction between large-scale wind and weather patterns, as well as the complex topography of the region, also contribute to the climate of Puget Sound.
