Season
Same week, every year
Comparison table
How the numbers are worked out
Storage level is working gas in underground storage at the end of the report week (a Friday), in billion cubic feet (Bcf), as published by EIA.
Injection / withdrawal is the change in the level from the week before: positive is a net injection, negative a net withdrawal. EIA's headline "net change" matches this except in the rare weeks when it reclassifies gas between working and base gas; those weeks are flagged in EIA's report notes.
Same week in another year is the report week whose week-ending date is closest to the same calendar date in that year (always within 3 days).
5-year average, high and low use the same week in each of the 5 years before the selected week's year. For example, a week in 2026 compares with 2021 to 2025. EIA's own published 5-year average can differ from this by a few Bcf in some weeks because of how it lines up dates across years.
Salt and Nonsalt are the two parts of South Central. Data starts in 2010, when EIA's current five-region survey began.