Hermiston, OR. Ambient Temperature Hermiston, OR. Hourly Average Ambient Temperature For 1980 to 2009 Latitude: 45.82 degrees Longitude: 119.28 degrees Altitude: 180 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 0.2 0.0 -0.1 -0.2 -0.4 -0.4 -0.5 -0.5 0.2 1.4 2.6 3.6 4.2 4.5 4.4 3.9 2.9 2.0 1.6 1.2 1.0 0.7 0.6 0.4 1.4 Feb 1.2 1.0 0.7 0.5 0.3 0.1 -0.0 0.3 1.9 3.9 5.4 6.7 7.6 8.1 8.4 8.1 7.1 5.3 4.2 3.4 2.8 2.3 1.9 1.6 3.5 Mar 4.7 4.3 3.9 3.6 3.4 3.2 3.3 5.0 7.3 9.2 10.8 12.1 12.9 13.6 13.8 13.7 13.0 11.4 9.4 8.1 7.0 6.3 5.8 5.2 8.0 Apr 7.4 6.8 6.3 5.8 5.4 5.4 7.2 9.7 11.8 13.5 15.0 16.2 17.1 17.7 17.9 17.8 17.2 16.0 13.9 11.9 10.5 9.4 8.7 8.0 11.5 May 11.5 10.8 10.3 9.7 9.4 10.4 12.7 14.8 16.5 18.1 19.5 20.6 21.6 22.3 22.7 22.6 22.2 21.2 19.4 17.0 15.3 14.0 13.1 12.3 16.2 Jun 15.0 14.3 13.7 13.1 12.8 14.3 16.5 18.2 19.8 21.4 22.8 24.0 25.0 25.8 26.3 26.4 26.1 25.4 23.8 21.3 19.2 17.7 16.6 15.8 19.8 Jul 18.7 17.9 17.2 16.5 16.0 17.2 19.7 21.7 23.6 25.3 27.0 28.4 29.6 30.6 31.3 31.6 31.4 30.7 28.9 25.8 23.4 21.7 20.5 19.6 23.9 Aug 18.3 17.5 16.7 16.0 15.4 15.6 17.9 20.7 22.7 24.6 26.3 27.8 29.1 30.2 30.8 31.1 30.7 29.6 27.0 24.1 22.3 20.8 19.8 19.0 23.1 Sep 13.5 12.8 12.2 11.6 11.1 10.8 12.0 15.2 18.0 20.0 21.8 23.3 24.5 25.4 25.9 25.9 25.1 23.0 20.0 18.2 16.7 15.6 14.7 13.9 18.0 Oct 7.6 7.2 6.7 6.4 6.0 5.7 5.8 7.9 10.8 13.1 14.8 16.2 17.3 18.0 18.2 17.7 16.2 13.6 12.1 10.7 9.8 9.1 8.4 7.9 11.1 Nov 3.1 2.9 2.8 2.6 2.5 2.4 2.3 2.6 4.1 5.7 7.1 8.1 8.8 9.1 9.1 8.3 6.8 5.8 5.1 4.6 4.2 3.8 3.5 3.3 4.9 Dec -0.1 -0.3 -0.4 -0.4 -0.5 -0.6 -0.7 -0.7 -0.1 1.0 2.0 2.8 3.2 3.5 3.3 2.6 1.6 1.1 0.7 0.5 0.3 0.1 -0.0 -0.1 0.8 Values in Degrees Celsius Hermiston, OR. Daily Average Ambient Temperature For 1980 to 2009 Latitude: 45.82 degrees Longitude: 119.28 degrees Altitude: 180 meters Year\Mth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly 1980 ---- ---- ---- 14.1* 15.9 19.2 25.7 23.0 20.0 11.8 6.6 4.1 ---- 1981 3.9 4.9 9.1 13.0 16.9 19.7 23.4 25.3 22.0 11.1 6.6 3.0 13.3 1982 2.3 4.2 8.2 10.4 16.7 23.0 24.5 24.3 17.9 11.0 3.2 2.2 12.4 1983 4.8 6.5 10.1 11.6 20.1 19.7 22.8 25.0 16.8 12.1 7.6 -2.0 12.9 1984 1.6 4.4 9.7 11.0 15.0 19.7 25.7 24.7 17.8 10.1 5.7 -1.1 12.0 1985 -2.0 1.2 7.4 14.0 18.0 21.6 28.1 23.0 14.3 9.0 -4.0 -7.1 10.3 1986 -0.4 2.4 8.2 9.5 15.1 21.2 19.7 23.9 14.9 10.3 4.7 -1.3 10.7 1987 -2.0 2.5 7.4 12.2 16.2 20.1 21.2 21.3 18.0 10.3 4.6 0.3 11.1 1988 -0.5 4.8 7.1 11.9 15.5 19.4 24.6 23.6 17.5 13.6 5.8 -0.3 11.9 1989 2.1 -4.6 5.5 12.0 15.0 22.0* 22.1 21.0 17.2 10.6 6.7 0.6 11.0 1992 ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- 3.3 -0.8 ---- 1993 -5.0 2.4 7.2 12.0 18.8 18.6 18.6 20.4 17.2 11.0 -1.5 0.8 10.1 1994 2.6 -0.6 7.2 11.5 15.8 18.0 24.1 22.6 20.1 11.6 4.2 1.7 11.6 1995 0.3 5.7 7.5 10.8 16.6 18.9 23.2 20.8 19.2 10.6 8.0 1.6 12.0 1996 0.8 0.9 7.4 12.3 13.9 18.9 24.1 22.3 17.0 11.0 4.4 0.7 11.2 1997 1.0 4.3 8.1 10.8 17.4 19.0 23.0 24.2 18.4 11.3 6.0 2.4 12.2 1998 2.4 6.1 8.3 11.4 15.0 19.9 25.9 24.2 20.4 10.6 8.0 2.5 12.9 1999 4.9 6.3 7.5 10.3 14.1 18.8 22.1 23.5 17.1 10.9 7.8 4.2 12.3 2000 2.2 4.2 7.6 13.3 15.9 20.4 23.2 22.8 17.1 10.8 2.0 0.1 11.6 2001 1.4 2.7 8.3 10.6 17.1 18.3 23.2 24.0 19.3 11.4 6.0 3.3 12.2 2002 3.7 3.8 6.1 11.5 14.9 20.4 25.0 22.3 18.0 9.8 4.9 3.9 12.1 2003 4.7 4.3 10.2 11.1 15.5 21.0 26.0 23.7 19.2 13.5 4.1 1.9 13.0 2004 -1.2 3.7 10.1 12.3 15.6 20.4 25.2 24.1 17.6 12.6 5.2 2.9 12.4 2005 0.8 3.1 9.6 12.0 17.2 19.0 24.4 23.6 17.4 12.7 4.7 -1.2 12.0 2006 5.6 2.8 7.8 11.4 16.2 20.2 25.5 22.6 18.1 10.9 5.7 0.2 12.3 2007 -0.1 4.3 9.2 11.5 16.5 19.6 25.6 22.2 17.7 10.8 4.6 2.9 12.1 2008 0.3 5.5 6.6 9.4 16.3 18.9 24.0 22.2 17.5 11.0 6.4 -1.6 11.4 2009 1.9 2.4 5.8 10.8 16.5 20.5 25.2 23.5 18.8 10.2 5.4 -2.6 11.6 Average 1.4 3.4 8.0 11.6 16.2 19.9 23.9 23.1 18.0 11.1 4.9 0.8 11.9 % SD 177 69 16 10 8 6 8 6 9 10 54 329 7 Values in average daily Degrees Celsius * Less than 15 days of data in month. Univ. of Oregon Solar Radiation Monitoring Lab.