GWDD Decomposition · 2026-06-18 00z · Updated Jun 25, 2026 at 09:07 PM UTC / Jun 25 at 04:07 PM 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 14.2
CDD 82.5
Total 96.8
IFS
HDD 9.6
CDD 89.0
Total 98.5
GEFS
HDD 8.8
CDD 88.8
Total 97.7
AIFS
HDD 7.5
CDD 92.8
Total 100.3
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