Based on data since 1990, the featured map presents the 90th percentile date for last spring season sub 32 degree low temperature. Rewording, on average 9 out of 10 years have seen the last sub-32 degree by the given date. The map shows we have another week or two to go before climatological risk of a freezing temperature drops below 10%. There is a lot of variability shown with nearby stations sometimes a week or two of difference and you may be wondering why. Subtle differences in the station's siting (like being on a small hill or in a depression) will lead to a few degrees or more of difference in low temperature. You can generate this map on the website for other thresholds and percentiles of your choice!

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