Editing Olympia, Washington (section)

===Climate===
Olympia has a warm-summer [[Mediterranean climate]] ([[Köppen climate classification|Köppen]]: ''Csb''). The local [[microclimate]] has dry summers in July and mildly humid summers in early June and late August, with cool July and August overnight lows. It is part of USDA [[Hardiness zone]] 8a, with isolated pockets around Puget Sound in zone 8b.<ref>{{cite web|title=USDA Plant Hardiness Zone Map|url=http://planthardiness.ars.usda.gov/PHZMWeb/|publisher=United States Department of Agriculture|access-date=June 1, 2014|archive-url=https://web.archive.org/web/20140227032333/http://planthardiness.ars.usda.gov/PHZMWeb/|archive-date=February 27, 2014|url-status=dead}}</ref> Most of western Washington's weather is brought in by weather systems that form near the [[Aleutian Islands]] in [[Alaska]]. It contains cold moist air, which brings western Washington cold rain, cloudiness, and fog. November through January are Olympia's rainiest months. City streets, creeks, and rivers can flood from November to February. The monthly mean temperature ranges from {{convert|38.4|°F|1}} in December to {{convert|64.1|°F|1}} in August. Seasonal snowfall for 1981–2010 averaged {{convert|10.8|in|cm|1}}<ref name= "NWS Seattle, WA (SEW)">{{cite web
|url = https://w2.weather.gov/climate/xmacis.php?wfo=sew
|title = NOWData - NOAA Online Weather Data
|access-date = September 5, 2016
|publisher = [[National Oceanic and Atmospheric Administration]]
|archive-date = May 14, 2021
|archive-url = https://web.archive.org/web/20210514063409/https://w2.weather.gov/climate/xmacis.php?wfo=sew
|url-status = dead
}}</ref> but has historically ranged from trace amounts in 1991–92 to {{convert|81.5|in|cm|abbr=on}} in 1968–69.<ref name = "NWS Seattle, WA (SEW)"/>

[[File:Monthly Climate Normals (1991-2020) - Olympia Area, WA(ThreadEx).svg|thumb|right|Climate chart for Olympia]]
Olympia averages {{convert|50|in|mm|sigfig=3}} of precipitation annually and has a year-round average of 75% cloud cover. Annual precipitation has ranged from {{convert|29.92|in|mm|abbr=on}} in 1952 to {{convert|66.71|in|mm|abbr=on}} in 1950; for water year (October 1 – September 30) precipitation, the range is {{convert|32.71|in|mm|abbr=on}} in 2000–01 to {{convert|72.57|in|mm|abbr=on}} in 1998–99.<ref name = "NWS Seattle, WA (SEW)"/> With a period of record dating back to 1948, extreme temperatures have ranged from {{convert|-8|°F|0}} on January 1, 1979, up to {{convert|110|°F|0}}, on June 28, 2021; the record cold daily maximum is {{convert|18|°F|0}} on January 31, 1950, while, conversely, the record warm daily minimum is {{convert|69|°F|0}} on July 22, 2006.<ref name = "NWS Seattle, WA (SEW)"/> Between 1991 and 2020 the mean coldest daily maximum was right on the freezing point at {{convert|32|F|C}} and the warmest night of the year averaged a very mild {{convert|60|F|C}}.<ref name= "NWS Seattle, WA (SEW)"/>

On average, 6.3 days annually reach {{convert|90|°F|0}}, 1.8 days stay at or below freezing all day, and 78 nights reach the freezing mark.<ref name = "NWS Seattle, WA (SEW)"/> The average window for freezing temperatures is October 8 through May 3, allowing a growing season of 157 days, nearly 100 days shorter than in Seattle.<ref name = "NWS Seattle, WA (SEW)"/>

{{Olympia, Washington weatherbox}}

{{Graph:Weather monthly history
| table=ncei.noaa.gov/weather/Olympia, Washington.tab
| title=Olympia monthly weather statistics
}}