The phrase "temperature curve" refers to a line or graph that shows the changes in temperature over a period of time. It helps to visualize how the temperature goes up and down throughout the day, month, or year. Full definition
The observed temperature curve frequently gets out of the band which strikes me as a bad sign. (realclimate.org)
The connection is through common computer processing that left its footprints in all three publicly available temperature curves, all in exactly the same places. (judithcurry.com)