Tracking the Teletherms: The spatiotemporal dynamics of the hottest and coldest days of the year [arXiv]

Oodles of station level plots of Teletherm dynamics and diagnostics:

• 50 year Summer and Winter Teletherm dynamics for 1,147 stations across the contiguous United States (pdf, 18M)
  
• 25 year Summer and Winter Teletherm dynamics for 1,208 stations across the contiguous United States (pdf, 22M)
  
• 10 year Summer and Winter Teletherm dynamics for 1,218 stations across the contiguous United States (pdf, 23M)
  
Notes:
1. Plots include Teletherm date, periods/extents, and temperature. See examples below for 25 year Teletherms.
2. Some stations are omitted for having insufficient data.
3. Rather than view in a browser, best to download the pdf and flip through, using a pdf viewer's search to find particular stations.
4. Stations are grouped alphabetically in order of full name of state (e.g., VT precedes VI) and then ordered alphabetically within state groups.
• Summer Teletherm diagnostic maps for 1218 stations across the contiguous United States (zip file, 57M)
• Winter Teletherm diagnostic maps for 1218 stations across the contiguous United States (zip file, 56M)

Example 1/3: Stations in Mississippi typically show broad Teletherm extents, particularly in the summer. It gets hot and stays hot. For Aberdeen, we see a long Summer Teletherm Extent early on in the 1900s, a sharpening up over 50 years, and then an abrupt move to an earlier date at the end of the 1970s. Most recently, the Summer Teletherm has widened up again and the date has moved back to later in the year. From the 1950s, the Teletherm temperature fell and has remained constant from 1980 on. The Winter Teletherm has moved around considerably, holding steady for decades and showing a small Teletherm extent.

Example 2/3: The station Uniontown, Pennsylvania shows a kind of bifurcation we see in many areas for the Winter Teletherm. Often occurring in the 1970s and 1980s, a steady Winter Teletherm spilts into two periods, with the Teletherm itself switching between them. The Winter Teletherm has also cooled from 1950 on, with a slight rebound from 1990 to 2012. The Summer Telether shows an initially wide extent, then a clear Teletherm up until the mid 1960s when the Teletherm becomes spread out. By 1980, the Summer Teletherm has become locked in again though the extent has widened very recently.

Example 3/3: We also regularly see the Winter Teletherm abruptly moving to an earlier date in the year, often in the 1970s or 1980s. The station at Kennewcick, WA is a good representative. The Winter Teletherm's temperature for Kennewick has also risen gradually over 1913 to 2012, notably dropping somewhat after the shift in Teletherm date. Kennewick's Summer Teletherm has remained impressively stable in date, extent, and temperature.