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
1999.m_tnnm_tnndm_tnam_dtn0m_dtn10m_dtn20
January-11.51998-12-31-2.72910
February-10.81999-02-01-3.01930
March-3.61999-03-151.61200
April0.51999-04-046.8000
May2.91999-05-1910.0000
June8.31999-06-2514.0000
July12.61999-07-1916.4002
August9.11999-08-2714.6001
September9.11999-09-0613.0000
October-3.21999-10-186.6400
November-9.31999-11-280.31500
December-14.11999-12-23-2.32330