# Cumulative precipitation (Chapel Hill 2 W, seven-day window) | PIER20 benchmarks

What does Cumulative precipitation (Chapel Hill 2 W, seven-day window) show?

Cumulative precipitation (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 **75.70 mm**. That is down 12.4% over the past year and above its long-run median of 14.70 mm.

## Summary statistics (full history)

| Series | First | Latest | Min | Max |
|---|---|---|---|---|
| PIER20 calculation: Cumulative precipitation (Chapel Hill 2 W, seven-day window) | 60.20 | 75.70 | 0.00 | 258.60 |

## Last 24 readings

| Date | PIER20 calculation: Cumulative precipitation (Chapel Hill 2 W, seven-day window) |
|---|---|
| Jul 2026 | 72.40 |
| Jul 2026 | 75.20 |
| Jul 2026 | 77.50 |
| Jul 2026 | 46.80 |
| Jul 2026 | 24.70 |
| Jul 2026 | 8.20 |
| Jul 2026 | 7.70 |
| Jul 2026 | 7.70 |
| Jul 2026 | 4.90 |
| Jul 2026 | 2.60 |
| Jul 2026 | 1.30 |
| Jul 2026 | 11.20 |
| Jul 2026 | 11.20 |
| Jul 2026 | 62.00 |
| Jul 2026 | 20.30 |
| Aug 2026 | 14.70 |
| Aug 2026 | 7.10 |
| Aug 2026 | 8.60 |
| Aug 2026 | 8.60 |
| Aug 2026 | 11.40 |
| Aug 2026 | 17.00 |
| Aug 2026 | 18.30 |
| Aug 2026 | 18.30 |
| Aug 2026 | 75.70 |

## Frequently asked questions

**What is the current cumulative precipitation (Chapel Hill 2 W, seven-day window)?**

As of 9 Aug 2026, the latest reading is 75.70 mm. That is down 12.4% over the past year and above its long-run median of 14.70 mm.

**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: Cumulative precipitation (Chapel Hill 2 W, seven-day window), sourced from NOAA/NCEI.

## Methodology

- Formula: sum(valid daily precipitation)
- Frequency: Daily
- Sources: PIER20 calculation: Cumulative precipitation (Chapel Hill 2 W, seven-day window) (NOAA-01) 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-01
Disclaimer: research software output, not investment advice.