La Crosse Technology WS- 1910TWC-IT Instruction Manual page 24

3. When viewing History records, press MIN/ MAX to view older records.
(Press MIN/MAX and + key to view "Previous" and "Next" record respectively. The
records are made at 3-hour intervals)
NOTE:
The stored history records will not be retained after battery change or whenever
battery is removed.
The total rainfall value will be exhibited in whole number (no decimal place) in the
history record.
VIEW THE MAXIMUM/MINIMUM WEATHER DATA
The weather station will record the minimum and maximum value of the various weather
data with time and date of recording automatically. The following stored maximum and
minimum weather data can be viewed by pressing the MIN/MAX key in normal display
mode.
1. MIN outdoor temperature with the date and time of recording
temperature value
HISTORY icon
Time and date
or recording
MIN outdoor
MIN icon
24