Unfortunately at the moment, because of the government shutdown, the NCDC (National Climatic Data Center) Web site, with weather records, is not accessible for you to find the official information. However, we've found some non-government sources that might help.
The dates will depend on what temperature data you are using (32 degrees, 36 degrees), and what percentile of occurrences (10, 50, 90 percent, etc.). We use 32 degrees and 50 percent. From what we're finding from non-government sources, the last expected spring frost for Astoria can average around April 8 or 9 (for other temps/percentages, it can be as early as mid-March, more mid-April, or April 30 or May 1), and the first expected fall frost around November 7 to 9 (for other temps/percentages, it can be as early as October 14 or thereabouts, or into early December).
You might also be interested in the following Web site:
Free Email Newsletters
Almanac Weekly Companion:Editors handpick timely topics: weather, gardening, the Moon, folklore, and more.
The Almanac.com General Store: Great savings, exclusive offers!
Almanac Recipe Box: Our best recipes delivered twice a month.
Great Almanac Giveaway: A monthly chance to WIN a fabulous prize.
Check out this month's prize: from Almanac.com
Enter to win!
Visit the Almanac Live!
See where we live.
Look through the Almanac webcams.
Visit our sister Web site: www.YankeeMagazine.com
Custom programming and server maintenance by Reinvented Inc.
©2014, Yankee Publishing, Inc., P.O. Box 520, Dublin, NH 03444, (603) 563-81112014-09-17 20:08:17