Chironomids (non-biting midges) preserved in the sediment of Seebergsee (46°37°N, 7°28°E) will be used to infer past mean July air temperatures for the past 150 years. Two models of calibration will be used: a spatial calibration using 101 lakes in Switzerland (see Larocque et al. 2009) and a calibration in time based on instrumental data. The three months of funding will allow the validation of the technique and publication of two papers. However, the larger goal of this project would be to reconstruct temperature over the last millennium, at high temporal resolution, and determine if, as models predict, the climate variability was higher during warmer periods of the past.