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Table 1 Treatment, year, ignition date, weather conditions, and flame lengths for prescribed burns from 1997 through 2014 for the season and frequency of burn study in the Blue Mountain Ecoregion, Oregon, USA.

From: Long-Term Effects of Burn Season and Frequency on Ponderosa Pine Forest Fuels and Seedlings

Treatment Year Ignition date Temperature range (°C) Relative humidity (%) Wind speed (km hr−1) Flame length (m)
Initial fall burn 1997 30 Sep, 16 Oct 13.9 to 20.6 24 to 40 0.0 to 8.0 0.0 to 1.5
Initial spring burn 1998 17 Jun 15.5 to 21.7 12 to 44 3.2 to 8.0 0.6 to 1.5
Fall reburn 1 2002 8, 9 Oct 10.5 to 18.3 17 to 44 0.0 to 11.3 0.3 to 0.9
Spring reburn 1 2003 22 May 21.1 to 23.3 30 to 32 0.0 to 9.7 0.3 to 0.6
Fall reburn 2 2007 13, 15 Oct 10.0 to 16.1 32 to 54 0.0 to 3.2 0.0 to 0.9
Spring reburn 2 2008 19 May, 14 Jun 23.9 to 30.0 19 to 30 0.0 to 8.0 0.3 to 1.2
Fall reburn 3a (5 yr) Fall reburn 1a (15 yr) 2012 18 Oct 16.1 to 16.7 22 to 25 1.6 to 6.4 0.2 to 0.6
Spring reburn 3a (5 yr) Spring reburn 1 a (15 yr) 2013 3, 7 May 15.6 to 25.6 21 to 33 0.0 to 8.0 0.2 to 0.6
Fall reburn 3b (5 yr) Fall reburn 1b (15 yr) 2013 22, 24 Oct 15.0 to 18.9 26 to 41 0.0 to 4.8 0.2 to 0.6
Spring reburn 3b (5 yr) Spring reburn 1b (15 yr) 2014 14 May 19.4 to 22.2 19 to 24 1.6 to 8.0 0.3 to 0.9
  1. a Two stands
  2. b Four stands