Every time clear urination during winter

Last year during winters, I started to have polyuria ( urine was clear every time n in excess amount), which came to normal automatically during may to June till 20 Oct this year  till this time urine function was normal and it's concerntrated but with the help of desmopresin which was not working in winters but working in summers!!  but again same problem started in the initial of winters, Clear urine every time Liver report is fine Kidney function normal Tachycardia found Rest all reports are normal Medical history :- Severe food allergic reaction Diabetes mellitus  fasting :- 78 (check several times)  Average A1c - 5.4 Doctor found possible causes :- 1) Cold diruesis 2) Fast heart rate 3) Anti-diruetic hormone deficiency 4) Stress or Anxiety problems 5) Poor blood circulation 6) Partial Nephrogenic diabetes insipidus What could be the exact cause behind it?