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

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year	Winter months^b
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

^a Data were obtained from the weather station Cologne/Bonn (no. 10513) of the Deutscher Wetterdienst.
^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.

ISSN: 1756-3305