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== Thermal Seasons ==
[[File:Thermal Seasons.jpg|thumb|right|Thermal Seasons]]
A variation on the [https://jussilanet.com/chartstermiset.htm Thermal Seasons] chart by [https://cumulus.hosiene.co.uk/memberlist.php?mode=viewprofile&u=16853 @Pes]. This interesting chart, together with the Temperature Sum and the Growing Degree Days it forms the set of Agriculture related charts, displays the proportional contribution of the seasons in the year where the boundaries between the seasons is simply defined by average temperature
This graph will be more important in the Nordic region where the growing season is short and requires careful planning. While The plant breeders are forcing the plants northbound, the farmers need to make it work. This type of charts helps.
And on the other hand: the temperature limits of the seasons thermal season vary with latitude: where Finland lets the spring start at 0 °C, in the Netherlands it is more 5 °C simply because otherwise there would not be a winter at all (which would not be correct because plants and animals are in rest). The temperature must be '''higher/lower than the limit for 10 days at least''' before the season changes.
This chart is also an heuristic and the limits can be defined by the user with the inifile parameters ''WinterToSpringTemperatureLimit'' and ''SpringToSummerTemperatureLimit'' which hold defaults of 0 °C and 10 °C (based on Finland). If the user uses Fahrenheit, just give the equivalent values of the limits in Fahrenheit.
As an indication for the limits the following is suggested (on the southern hemisphere use absolute value of latitude):
#Latitude > 55° => use limits of 0° and 10° Celsius for '''the average day temperature'''.
#Latitude between 45° and 55° => use limits of 5° and 15° Celsius
#Latitude between 35° and 45° => use limits of 10° and 20° Celsius
#Latitude < 35° => This chart most likely has no value, if it does, please notify).
== Daily EVT (Evapotranspiration) ==
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