# Lewis and Clark · MT — IECC/Building America climate zone by U.S. county, 2021 code cycle

For Lewis and Clark · MT, county is Lewis and Clark; state is MT; iecc 2021 climate zone is 6; moisture regime is B; building america climate zone is Cold, recorded from its source on 2026-08-19.

- **County:** Lewis and Clark _(verified: appears in the quote below)_
- **State:** MT _(our reading, not quoted from the source)_
- **IECC 2021 climate zone:** 6 _(verified: appears in the quote below)_
- **Moisture regime:** B _(verified: appears in the quote below)_
- **Building America climate zone:** Cold _(verified: appears in the quote below)_

## What the source says

> MT Lewis and Clark Cold 6 B

## Source

- https://www.osti.gov/servlets/purl/1893981

Last verified: 2026-08-19. Review by: 2028-08-18.
Part of [IECC/Building America climate zone by U.S. county, 2021 code cycle](https://referencesource.org/iecc-climate-zone-by-county/).