GWDD Decomposition · 2026-08-28 00z · Updated Aug 28, 2026 at 01:10 PM UTC / Aug 28 at 08:10 AM CT
NOAA Temperature Outlook
6–10 Day Temperature Outlook
8–14 Day Temperature Outlook
10-Day Cumulative Breakdown
HDD / CDD components per model
GFS
HDD 7.5
CDD 120.8
Total 128.3
IFS
HDD 5.3
CDD 119.9
Total 125.1
GEFS
HDD 5.1
CDD 118.8
Total 123.9
AIFS
HDD 4.7
CDD 119.6
Total 124.3
HDD-Only Forecast (Gas-Utility Weighted)
CDD-Only Forecast (Gas-Utility Weighted)
GWDD = HDD + CDD · all values gas-utility-consumption weighted across 9 EIA census divisions · National only · West not shown