Holmertz Jeg var skeptisk indledningsvist, men ud fra det her kan din oplevelse godt passe:
"As has been pointed out above, it's not actually about air pressure, it's about air density - the less dense the air, the less resistance there will be to your motion. Air pressure is a function of air temperature and air density. Increasing either of these will increase pressure.
The lowest air density will occur when you have an high temperature and low pressure, for example, after a thunderstorm.
If you have recorded both pressure and temperature for all your rides, you can estimate the air density as pressure/temperature."