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Table 4 Mean monthly air temperatures [°C] 2m above the soil near the Siebengebirge a in different years

From: Abundance of Ixodes ricinus and prevalence of Borrelia burgdorferi s.l. in the nature reserve Siebengebirge, Germany, in comparison to three former studies from 1978 onwards

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Winter monthsb
1986 2.6 −4.1 4.9 6.9 14.9 17.7 18.3 17.1 11.5 11.6 7.6 4.3 9.4 -
1987 −3.5 1.8 2.3 12.6 10.3 14.8 18.0 16.8 15.8 10.8 6.1 3.9 9.1 2.6
1988 5.8 4.0 4.9 9.4 15.9 20.6 17.4 17.7 14.1 11.1 5.2 6.5 11.1 -
1989 4.1 4.4 8.8 11.4 15.6 16.0 19.4 18.3 15.5 12.1 5.0 4.7 11.3 5.1
2002 3.2 7.0 7.3 9.7 14.3 18.0 17.9 18.8 13.9 10.0 8.3 3.9 11.0 -
2003 1.7 1.4 8.1 10.3 14.6 19.7 19.8 20.8 14.9 7.6 8.6 3.7 10.9 3.8
2006 0.2 1.8 3.8 9.1 14.5 17.8 23.3 16.2 18.4 14.0 8.9 5.8 11.2 -
2007 6.5 6.2 7.9 13.8 15.3 18.0 17.8 17.0 13.5 9.8 5.7 3.3 11.2 6.9
2008 5.9 5.1 5.8 8.8 16.5 17.3 18.2 18.2 13.0 10.2 6.5 2.0 10.6 5.0
  1. a Data were obtained from the weather station Cologne/Bonn (no. 10513) of the Deutscher Wetterdienst.
  2. b The mean temperature of the winter months were determined by calculating the mean monthly temperature from November of the previous year to February of the following year stated in the beginning of each line. For example, for 2007 the mean average temperature of the winter months was calculated from November 2006 until February 2007.