@idefix37 But the cloud base today scattered at 2700 and Broken at 3700 at Lydd airport. There was no rain except a,drizzle at 13.00 UTC. Yet the Meteogram showed a dark band right at the bottom with 0.2 blue vertical line at 13.00 UTC. The 'band' was almost black from late morning until late afternoon

@Korina said in How to read Meteogram:

Here is a description of units in Meteogram

Displayed temperature and dew point represents values 2m above the surface.

Wind displays average wind speed 10m above the surface level.
Wind gusts display values 10m above the surface in the last 3 hours.

Shaded area symbolises temperature on the upper side and dew point on the lower side. Color matches with the values given, corresponds with the color scale.

Temperature is close to the dew point = air is humid
The difference between temp. and d.p. is bigger = air is dry
Dew point and temp. are equal = relative humidity is 100% (fog)

800h is short for 800hPa
5km and 6400ft represent elevation both in meters and feet
FL100 is short for Flight Level 10000ft

Atmospheric pressure asl
Some values of this curve are shown in the hPa line.

Different colors of precipitations are explained in the Meteogram detail.

Deep blue = rain
Pink = convective rain
Light blue = snow

Grey clouds in Meteogram are calculated from relative humidity. It can be explained as a distribution of water in the atmosphere. The height in the Meteogram is in pressure levels. km/ft values are only rough estimation and they are AMSL.

I don't understand what the grey areas mean. Can someone explain please