Lower temperatures in the early morning

Yesterday’s morning was very cold.
Japan Meteorological Agency says,
“Temperature was -26.3°c in Kamikawa town, and the maximum temperature was -10.4°c.”
We saw next door’s thermometer indicated -30°c.
And also visitor center’s thermometer indicated -23°c.
Look at the picture, we found “Frost tree” “Hoarfrost” “Frost flower” here and there.
We couldn’t push shatter button because of cold.
So we went back quickly.
It will be cold day for a few days.
Please take care of yourself.