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
1990.m_tnnm_tnndm_tnam_dtn0m_dtn10m_dtn20
January-12.21990-01-07-2.62330
February-5.61990-02-11-0.51700
March-4.51990-03-182.7800
April0.91990-04-145.4000
May4.31990-05-3110.5000
June6.11990-06-0113.0000
July8.41990-07-0813.3000
August9.41990-08-1912.9000
September0.71990-09-298.7000
October-5.61990-10-255.3500
November-3.11990-11-073.3800
December-6.51990-12-24-1.62200