What are the four weather measurements that are recorded?
Part one of the Contract Data includes four measurements for which ten year ‘return period statistics’ for each calendar month may be required. They are:
The cumulative rainfall (mm) (this includes the equivalent rainfall corresponding to falls of snow),
The number of days with rainfall more than 5 mm (a measure of the days when outside work may be interrupted by rain).
The number of days with minimum air temperature less than 0 degrees Celsius, and
The number of days with snow lying at a stated time GMT (in the UK, Met Office readings are taken at 09:00 hours GMT; the time may vary in other countries).
These measurements have been selected as being the minimum weather aspects which can have a significant effect on construction work in the UK and countries with similar climates.