1) Temperature vs Solar irradiance: https://climate.nasa.gov/climate_resources/189/graphic-tempe...
2) Temperature vs Sun activity: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/solact.htm...
3) Number of sunspots over the year: https://www.climate.gov/news-features/climate-qa/couldnt-sun...
Not sure why people think scientists would miss obvious things. If a non-specialist can think of a probable objection, chances are the specialist in that field has already study that objection in their intro classes.