Forecast Trend
Run-over-run model history vs the 5-year average
Latest 00z run 2026-06-25: 182.1 GWDDs
Each blue point is the GFS 00z run total for the Day 1-14 window on that date. The green line is the 5-year average GWDD for the same forward window, computed from observed NOAA temperatures.
Latest 00z run 2026-06-25: 158.4 PWCDDs
Power-weighted degree days over the Day 1-10 window. The green line is the 5-year average for the same window from the stored historical archive.
Reading the chart. A rising blue line means successive model runs are trending warmer (more cooling demand) for the forward window. When blue sits above green, the forecast window is running above the 5-year average; below green is under-average. The two charts use different windows: GWDD tracks the full Day 1-14 forecast, PWCDD tracks Day 1-10, which is its native horizon.
Updated Jun 25, 2026 at 09:45 PM
