Lay Summary

Appendix S1. Description of focal sites.

Appendix S2. R code for diurnal temperature variation function.

Figure S1. Topographic map of Colorado showing weather stations.

Figure S2. Proportion butterfly flight time as a function of temperature.

Figure S3. Trends in flight season means of minimum and maximum daily temperatures.

Figure S4. An analysis of temperatures, performance and demography during the flight season.

Figure S5. The proportion of extremes for daily hourly operative environmental temperatures.

Table S1. The weather stations used in the analysis.

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