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
1957.m_tnnm_tnndm_tnam_dtn0m_dtn10m_dtn20
January-15.21957-01-18-5.43140
February-5.21957-02-011.01200
March-6.91957-03-041.21400
April-0.61957-04-176.1200
May1.51957-05-109.3000
June10.01957-06-0215.2001
July11.71957-07-2316.5004
August7.31957-08-3114.2001
September3.01957-09-2810.6000
October0.11957-10-055.2000
November-7.81957-11-302.9700
December-21.71957-12-04-2.92520