Hermiston, OR. Relative Humidity Hermiston, OR. Hourly Average Relative Humidity For 1994 to 2007 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 90.7 91.1 91.3 92.0 91.5 91.8 91.5 91.9 90.8 87.9 84.8 82.3 80.1 78.8 79.0 80.6 83.9 86.4 88.2 89.0 89.8 90.4 90.6 90.9 87.7 Feb 87.9 88.8 89.3 89.8 90.4 90.6 90.9 90.3 87.0 81.4 75.7 70.6 66.9 64.1 62.7 63.3 66.8 72.4 76.5 80.6 83.3 84.7 86.1 87.2 80.3 Mar 81.7 82.7 83.7 84.8 85.6 85.7 85.8 81.4 74.5 67.6 61.4 56.1 52.4 49.7 48.2 48.5 50.6 56.1 62.1 67.6 72.8 76.1 78.1 79.8 69.7 Apr 79.4 81.2 82.8 83.8 84.9 84.9 80.5 72.4 65.2 58.6 53.0 48.5 45.5 43.4 42.5 42.4 44.0 48.1 54.4 60.3 67.1 72.1 74.7 77.1 64.4 May 74.0 75.8 77.6 79.4 80.9 78.2 71.2 64.7 58.6 53.4 48.8 45.1 42.0 39.5 38.4 38.6 39.7 42.5 48.1 53.7 59.6 65.0 68.4 71.0 58.9 Jun 67.9 70.5 72.5 74.5 75.2 71.4 64.6 59.4 54.2 49.0 44.8 41.2 37.9 35.6 34.3 33.5 34.2 36.4 41.2 47.3 53.0 58.2 61.8 64.8 53.5 Jul 56.2 58.8 60.9 63.0 64.2 61.8 55.4 51.2 46.8 42.0 37.6 33.8 30.6 28.1 26.2 25.1 25.0 26.4 30.7 37.0 42.0 47.3 49.8 52.7 43.9 Aug 56.8 59.1 61.5 63.6 65.3 65.1 59.6 53.6 49.7 44.8 39.8 35.8 32.4 29.8 27.8 26.7 26.9 29.1 34.9 40.2 45.5 49.3 51.6 54.5 46.0 Sep 65.4 67.2 69.6 71.3 72.5 73.7 71.3 63.1 57.4 51.9 46.6 42.0 38.6 35.9 34.1 33.8 36.0 40.9 46.3 51.6 56.0 58.4 61.2 64.1 54.5 Oct 79.5 80.5 81.8 82.7 83.5 83.9 84.1 79.5 71.6 65.3 59.7 54.6 50.9 49.0 48.2 49.0 54.0 60.2 65.1 70.1 72.6 74.4 76.4 79.0 69.0 Nov 88.8 89.1 89.1 89.1 89.4 89.6 89.7 89.2 86.4 82.4 78.2 74.3 71.7 69.9 69.9 72.8 77.3 80.8 83.3 85.2 86.5 87.3 87.7 88.6 83.2 Dec 90.2 90.5 91.4 91.7 91.6 91.9 92.0 92.1 90.8 88.2 85.5 83.1 81.3 80.3 80.6 82.6 85.5 87.2 88.5 89.1 89.4 89.8 89.8 89.7 88.0 Values in Percent Hermiston, OR. Daily Average Relative Humidity For 1994 to 2007 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 1994 64.8 64.8 64.8 64.8 64.8 64.8 42.4 45.1 51.1 65.5 82.5 88.2 63.7 1995 96.0 83.5 71.3 68.5 62.1 61.1 50.9 50.1 59.0 74.5 85.8 90.1 71.1 1996 89.7 83.0 74.1 69.2 64.2 57.2 48.3 48.2 58.1 75.4 89.3 92.7 70.8 1997 87.1 82.8 74.1 67.2 62.7 59.8 52.9 52.5 68.9 75.8 92.9 93.8 72.5 1998 91.2 86.3 78.2 71.1 72.4 60.7 51.5 48.9 61.7 75.2 85.8 82.6 72.1 1999 84.7 75.7 72.2 63.3 56.0 50.3 44.4 50.2 46.6 61.4 84.3 82.7 64.3 2000 87.5 87.7 72.0 59.5 55.4 49.7 43.7 41.8 61.2 75.8 87.9 91.1 67.7 2001 93.5 82.0 72.1 66.4 51.5 53.9 46.0 46.9 49.7 67.9 88.6 85.3 66.9 2002 82.2 78.0 66.2 58.1 57.7 54.8 42.3 44.5 49.9 63.0 79.8 88.9 63.7 2003 93.3 79.6 70.0 67.8 56.6 44.0 33.1 42.6 51.4 61.2 70.5 90.9 63.3 2004 88.9 87.0 61.4 63.4 62.8 53.1 41.1 50.3 57.7 66.0 80.5 86.7 66.5 2005 86.1 70.5 62.7 61.3 60.8 47.9 39.6 37.8 48.1 70.3 80.9 91.4 63.1 2006 80.3 67.0 63.9 63.8 55.1 55.5 37.7 40.3 50.1 65.3 76.0 88.8 62.0 2007 80.1 80.2 67.6 58.4 49.0 47.6 40.1 44.4 49.9 67.6 78.3 79.1 61.8 Average 86.1 79.1 69.3 64.5 59.4 54.3 43.9 46.0 54.5 68.9 83.1 88.0 66.4 % SD 9 9 7 6 10 11 13 9 12 8 7 5 6 Values in average daily Percent * Less than 15 days of data in month. Univ. of Oregon Solar Monitoring Lab.