dew point clipping and graph spikes

[2-Wheeler]

I'm getting spikes on the dew point graph of the main WD page. If it's still doing it, you can see the graph here: http://www.leyner.org/myweather.jpg  (pink line at bottom) 
You can also see the Temp line (green) also spiked as it dipped below zero.




This morning we had temps at -6.5 F with considerable fog and floating ice crystals. When the sun beamed through there were ice-halos and light pillars - very cool.

If I place my cursor over the dew point line, it shows 560! Quite impossible. But I'm wondering if there is something in the autoscale that's getting it fouled up, or if there is some range limit I need to set?

[Weather Display]

Hi
try setting the low graph temperature seting under graph setup lower., or use the lower temperature in the graph setup
(i.e its a out of range scale issue)

[2-Wheeler]

Thanks. I guess I just forgot where the seting was.