I have a problem with Avg and Extremes

[merlin]

Hi Steve

My porb is we have had a few frosts. But it is not showing up in Air frosts in etremes how can I fix this if it can be. Or does it not detect frosts at all by the weather station data.
Here are my Avg and Extremes for june 2009Summary for June 2009

Temperature (°C):
Mean (1 minute) 11.5
Mean (min+max) 12.2
Mean Minimum 6.3
Mean Maximum 18.2
Minimum 0.3 day 10
Maximum 20.3 day 02
Highest Minimum 12.7 day 02
Lowest Maximum 13.8 day 10
Air frosts 0

Rainfall (mm):
Total for month 15.3
Wettest day 12.3 day 02
Rain days 4

Wind (km/h):
Highest Gust 48.0 day 10
Average Speed 3.2
Wind Run 510.5 km
Gale days 0

Pressure (hPa):
Maximum 1032.4 day 01
Minimum 1001.5 day 10

Days with snow falling 0
Days with snow lying at 0900 0

ty for your time.

[steve]

The summary says your minimum temperature was 0.3 on the 10th, so according to that you haven't had any air frosts. What is it that makes you think that is wrong?

Edit: A thought occurs to me: Are you confusing air frosts and ground frosts? This might help - http://weatherfaqs.org.uk/node/26

To measure ground frosts you would need a grass thermometer.

[merlin]

Thanks now I feel like a dill lol