# Up to what radius/distance/area maximum do weather parameters remain constant?

Up to what radius/distance/area maximum do weather parameters remain constant? For example, precipitation is so variable that it can vary even within a few meters, while sunshine durations may not change/remain constant for much longer distances. For a project of mine, I need to know approximately up to what radius/distance/area maximum do different weather parameters remain constant including temperature, precipitation, humidity, wind speed, wind direction, humidity, cloud cover, evapotranspiration, soil moisture, soil temperature, and air quality.

• I think you have answered your own question - it depends on the parameter, and on the region and time of year. For instance in the UK winter rainfall is from weather fronts and is less variable spatially than summer convective rainfall. Temperatures are more variable in hilly regions than on plains. I suggest you look at high resolution gridded data (e.g. crudata.uea.ac.uk/cru/data/hrg) and then look at its spatial variability geostatistically for your area of interest. Commented Jun 19 at 15:28
• To have people even attempt at a ballpark, you'd definitely need to better define what you mean by constant (10% change? 1%?) And even then, a best guess only seems possible if talking about nearly flat regions outside of certain weather phenomena (hurricanes and fronts for example have large changes in some values in a very small distance) Commented Jun 20 at 6:23
• As phrased, this question is rather too broad. It can vary from centimetres (difference between a place struck by lightning or not) to hundreds of km (upper tropospheric humidity), and of course depends on what you mean by "constant". There is constantly no tornado for thousands of kms in most of the world most of the time. You can't really derive your answer from models, because their spatial resolution is too limited, nor from in-situ point measurements. I think you might need to reconsider what you really need for your project, or adjust your project aims.
– gerrit
Commented Jun 21 at 14:48