Description of elements in the header
m_tnnmonthly minimum temperature
m_tnndthe day with the monthly minimum temperature
m_tnathe monthly mean of the daily minimum temperatures
m_dtn0number of frost days with a minimum temperature of ≤ 0 °C
m_dtn10number of days with a minimum temperature of ≤ -10 °C
m_dtn20number of warm nights with a minimum temperature of ≥ 20 °C
1909.m_tnnm_tnndm_tnam_dtn0m_dtn10m_dtn20
January-13.51909-01-30-5.42740
February-13.81909-02-15-7.02680
March-6.51909-03-071.41000
April-0.51909-04-065.6200
May0.11909-05-0910.4000
June8.81909-06-1713.8000
July11.81909-07-3014.9000
August12.21909-08-2416.5000
September9.81909-09-0813.3000
October3.61909-10-259.0000
November-6.01909-11-251.31100
December-6.11909-12-011.5700