Forest Grove, OR. Ambient Temperature Forest Grove, OR. Hourly Average Ambient Temperature For 1997 to 2006 Latitude: 45.55 degrees Longitude: 123.08 degrees Altitude: 55 meters Mon\Hr 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Avg Jan 4.2 4.0 4.0 3.9 3.8 3.7 3.7 3.7 3.9 4.6 5.4 6.2 6.8 7.2 7.5 7.3 6.8 6.1 5.6 5.3 5.0 4.7 4.5 4.3 5.1 Feb 4.1 3.9 3.7 3.4 3.3 3.1 3.0 3.2 4.1 5.5 6.9 7.9 8.8 9.5 9.8 9.8 9.3 8.1 7.1 6.3 5.7 5.2 4.7 4.4 5.9 Mar 5.8 5.5 5.2 5.0 4.7 4.6 4.6 5.3 6.7 8.0 9.2 10.2 11.0 11.6 11.9 11.9 11.6 10.7 9.4 8.5 7.8 7.2 6.7 6.2 7.9 Apr 7.3 6.8 6.4 6.0 5.7 5.6 6.5 8.1 9.8 11.2 12.3 13.2 14.0 14.5 14.9 14.9 14.6 13.8 12.3 10.9 10.0 9.2 8.5 7.9 10.2 May 10.2 9.7 9.3 8.9 8.6 9.0 10.3 11.9 13.3 14.5 15.6 16.6 17.3 18.0 18.4 18.4 18.1 17.3 16.0 14.4 13.2 12.3 11.6 10.8 13.5 Jun 13.0 12.5 12.0 11.6 11.3 12.0 13.4 14.9 16.3 17.5 18.6 19.5 20.4 21.1 21.5 21.7 21.4 20.7 19.4 17.7 16.2 15.2 14.3 13.7 16.5 Jul 15.5 14.8 14.2 13.6 13.2 13.8 15.5 17.3 18.9 20.3 21.8 23.1 24.2 25.3 25.9 26.2 25.9 25.0 23.4 21.3 19.5 18.2 17.1 16.3 19.6 Aug 15.8 15.2 14.5 13.8 13.3 13.1 14.6 16.6 18.6 20.2 21.8 23.2 24.5 25.6 26.3 26.6 26.2 25.1 23.1 21.0 19.5 18.3 17.4 16.5 19.6 Sep 13.4 12.8 12.1 11.5 10.9 10.5 11.1 13.4 15.8 17.9 19.6 21.0 22.3 23.1 23.6 23.6 23.0 21.4 19.3 17.7 16.6 15.6 14.8 14.0 16.9 Oct 9.0 8.6 8.3 8.0 7.8 7.6 7.6 8.5 10.2 11.9 13.4 14.5 15.5 16.2 16.5 16.3 15.4 13.9 12.6 11.6 10.8 10.2 9.7 9.3 11.4 Nov 5.7 5.6 5.5 5.3 5.2 5.1 5.0 5.2 6.0 7.1 8.3 9.2 9.9 10.3 10.5 10.2 9.2 8.3 7.7 7.2 6.8 6.4 6.1 5.9 7.2 Dec 3.7 3.5 3.4 3.3 3.2 3.2 3.1 3.1 3.4 4.1 5.1 5.9 6.6 7.0 7.1 6.8 6.1 5.5 5.0 4.7 4.4 4.1 4.0 3.8 4.6 Values in Degrees Celsius Forest Grove, OR. Daily Average Ambient Temperature For 1997 to 2006 Latitude: 45.55 degrees Longitude: 123.08 degrees Altitude: 55 meters Year\Mth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly 1997 4.8 5.8 7.8 10.0 15.9 15.8 19.3 20.6 17.4 11.1 9.3 4.1 11.8 1998 6.4 7.4 8.8 10.6 12.6 16.5 20.7 20.5 18.3 10.8 8.6 4.2 12.1 1999 5.1 6.1 7.1 9.7 11.5 14.9 18.1 19.1 16.8 11.4 9.1 5.6 11.2 2000 3.9 6.1 7.1 11.1 12.9 17.6 18.7 18.3 16.3 11.3 4.8 4.0 11.0 2001 4.6 4.7 8.0 8.5 14.2 14.8 17.9 19.3 17.1 10.7 8.1 4.8 11.1 2002 4.8 6.0 6.2 10.3 12.1 16.9 19.8 19.2 16.8 10.8 7.3 5.6 11.3 2003 6.7 6.0 8.6 9.1 13.2 18.2 20.6 19.5 18.2 13.1 5.9 5.0 12.1 2004 3.3 6.3 9.5 11.6 13.9 17.4 20.7 20.5 15.6 12.2 6.2 5.2 11.9 2005 5.1 5.2 8.9 10.1 14.6 15.2 20.1 20.1 15.6 11.9 5.2 3.5 11.3 2006 6.5 4.9 6.9 10.6 14.3 17.7 20.3 19.1 16.7 10.7 7.3 3.8 11.6 Average 5.1 5.9 7.9 10.2 13.5 16.5 19.6 19.6 16.9 11.4 7.2 4.6 11.6 % SD 22 13 14 9 10 8 5 4 6 7 22 16 4 Values in average daily Degrees Celsius * Less than 15 days of data in month. Univ. of Oregon Solar Monitoring Lab.