WeatherWatcher: Puget Sound and Lake Washington are a natural air conditioner for us

Week of weather September 10 - 16, 2011

Highlights:

We still have not broken the 85ºF mark here in the Shoreline/Lake Forest park area this entire summer, even though the Sea-Tac station which is the Seattle area official record keeper for weather statistics has broken the 85ºF mark several days now. I think the only difference is we are less than 5 miles from the Puget Sound, and we are less than 5 miles from Lake Washington, moderating our temperature locally. Both bodies of water are around 55ºF during the summer months. These large bodies of water act as a natural air conditioner.

For the week ahead:

This week is going to be summer's last gasp before we head into the real fall weather. This past weekend (17th - 18th) was just a taste of what the end of September will bring.

We will have moderate high pressure in the area however there are several very strong storm systems lined up in the Pacific that may work to break it down. We might see one of the storms move through as some high clouds and a couple showers later in the week.

The extremes:

High temperature: 84.6ºF (Sunday)

Low temperature: 47.9ºF (Friday)

High humidity: 100%

Low humidity: 27% (Sunday)

Barometer high: 29.707 inHg

Barometer low: 29.382 inHg

Barometer shift: 0.325 inHg

Averages:

Warmest day: 68.2ºF (Sunday)

Coldest day: 55.5ºF (Thursday)

Average temperature: 61.8ºF

Average humidity: 75%

Warmest and coldest days are based on average temperature of the entire day, starting at midnight. All other averages are based on the whole week. All weather data unless otherwise noted is sourced from Carl's Shoreline Weather Station.