I have added a new viewer to my SYNOPSYNOP SYNOP (surface synoptic observations) is a numerical code (called FM-12 by WMO) used for reporting weather observations made by manned and automated weather stations. SYNOP reports are typically mad hourly and consist of groups of numbers (and slashes where data is not available) describing general weather information, such as the temperature, barometric pressure and visibility at a weather station. climate application to display estimated daily temperatures for the whole of the UKUK The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and Northern Ireland.. I use as many daily reported maximum and minimum temperatures from WMOWMO The World Meteorological Organisation is a specialized agency of the United Nations responsible for promoting international cooperation on atmospheric science, climatology, hydrology and geophysics. stations 03001 to 03950 as I can to calculate a UK mean for all stations below 250 M amslAMSL The height Above Mean Sea Level.. That equates to around 120 observations each day. Nowhere near as accurate as the 1 km x 1 km gridded estimates from the UKMOUKMO The Meteorological Office is the United Kingdom's national weather service. It is an executive agency and trading fund of the Department for Business, Energy and Industrial Strategy, but good enough for me. As you can see it picks out the two heatwaves that have occurred this year. It does look like my estimates maybe just two high though, because mean temperatures in both July and August were much close to average than this. That’s not really that surprising because its totally dependent on an even spread of site location, but they tend to be further south and coastal sites. I suppose that I could use all available sites, even those on mountains, and adjust their temperatures down to sea level.