Servicio Meteorologico shows NO weather stations in Chapala that I could find.. No reasons to get your feathers all fluffy - just asking specifically where you got the data from as it is definitely NOT from a weather station in Chapala.
No fly in that ointment cause no weather station is chapala..
I still have the same question - what is the source of the data for Chapala as I really don't think Chapala has a weather station. The closest I could find would be Atequiza but that doesn't make sense.
Can you please provide a source for your data - even sourcing the national weather service data that you used for chapala would help - as I am sure I am not the only one wondering where the weather station in Chapala is and has been for 30 years.
As an added note - I agree with previous posters that weather is not going to be an issue when deciding to live in San Miguel or Lake Chapala - as each has its pluses and minuses - depends on what is important to you....
But back to facts - looking for facts about the chapala weather station as I think the facts are: it does not exist -
Why don't you spend half as much time looking at the whole picture as opposed to dwelling on finding the fly in the ointment.
What part of:
*ALL DATA FROM SERVICIO METEOROLÓGICO NACIONAL de MEXICO