# Extreme-heat days (Chapel Hill 2 W, seven-day window) | PIER20 benchmarks

What does Extreme-heat days (Chapel Hill 2 W, seven-day window) show?

Extreme-heat days (Chapel Hill 2 W, seven-day window) is a source-faithful PIER20 calculation from NOAA/NCEI data. Scope: NOAA GHCN station Chapel Hill 2 W (GHCND:USC00311677), North Carolina. Each chart point covers the seven calendar days ending on that date; anomalies use 1991–2020 same-window normals. It follows the published eligibility, denominator, missing-value, revision and coverage rules in the Phase 1 computation contract.

As of **9 Aug 2026**, the latest reading is **6.00 days**. That is above its long-run median of 0.00 days.

## Summary statistics (full history)

| Series | First | Latest | Min | Max |
|---|---|---|---|---|
| PIER20 calculation: Extreme-heat days (Chapel Hill 2 W, seven-day window) | 0.00 | 6.00 | 0.00 | 7.00 |

## Last 24 readings

| Date | PIER20 calculation: Extreme-heat days (Chapel Hill 2 W, seven-day window) |
|---|---|
| Jul 2026 | 7.00 |
| Jul 2026 | 7.00 |
| Jul 2026 | 7.00 |
| Jul 2026 | 7.00 |
| Jul 2026 | 6.00 |
| Jul 2026 | 6.00 |
| Jul 2026 | 6.00 |
| Jul 2026 | 6.00 |
| Jul 2026 | 6.00 |
| Jul 2026 | 6.00 |
| Jul 2026 | 6.00 |
| Jul 2026 | 7.00 |
| Jul 2026 | 7.00 |
| Jul 2026 | 7.00 |
| Jul 2026 | 3.00 |
| Aug 2026 | 4.00 |
| Aug 2026 | 5.00 |
| Aug 2026 | 6.00 |
| Aug 2026 | 6.00 |
| Aug 2026 | 5.00 |
| Aug 2026 | 5.00 |
| Aug 2026 | 6.00 |
| Aug 2026 | 6.00 |
| Aug 2026 | 6.00 |

## Frequently asked questions

**What is the current extreme-heat days (Chapel Hill 2 W, seven-day window)?**

As of 9 Aug 2026, the latest reading is 6.00 days. That is above its long-run median of 0.00 days.

**How often is this benchmark updated?**

This benchmark is built on daily data. The page is refreshed when the source publishes new observations; the freshness block below the chart shows the exact data-through date and when PIER20 last fetched the file.

**What data sources does this chart use?**

The chart is built from PIER20 calculation: Extreme-heat days (Chapel Hill 2 W, seven-day window), sourced from NOAA/NCEI.

## Methodology

- Formula: count(TMAX > 30°C)
- Frequency: Daily
- Sources: PIER20 calculation: Extreme-heat days (Chapel Hill 2 W, seven-day window) (NOAA-07) https://www.ncei.noaa.gov/cdo-web/webservices/v2. Data via NOAA/NCEI.
- Data through: 9 Aug 2026
- Last refreshed: 12 Aug 2026

Full interactive chart: https://pier20.com/benchmarks/phase1-noaa-07
Disclaimer: research software output, not investment advice.