Growing-degree days (Chapel Hill 2 W, seven-day window)
Growing-degree 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.
- Latest
- 117.25
- 1Y change
- +40.25 degree-days
- vs median
- +69.45 degree-days
- Percentile
- 92nd
- Best reading
- 137.00
| Series | First | Latest | Min | Max |
|---|---|---|---|---|
| PIER20 calculation: Growing-degree days (Chapel Hill 2 W, seven-day window) | 0.00 | 117.25 | 0.00 | 137.00 |
This is an accumulation indicator, not an observed yield effect.
How this is calculated
sum(max(0, min(Tmean, 30°C) − 10°C))sum(max(0, min(Tmean, 30°C) − 10°C)). 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. Source: NOAA/NCEI. NOAA/NCEI does not endorse this analysis; recent observations may be preliminary. Source period, last checked, dataset vintage, units, revision status, coverage and formula version are recorded in the derived artifact.
As of 9 Aug 2026, the latest reading is 117.25 degree-days. That is up 52.3% over the past year and above its long-run median of 47.80 degree-days.
Frequently asked questions
3 answersWhat is the current growing-degree days (Chapel Hill 2 W, seven-day window)?
As of 9 Aug 2026, the latest reading is 117.25 degree-days. That is up 52.3% over the past year and above its long-run median of 47.80 degree-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: Growing-degree days (Chapel Hill 2 W, seven-day window), sourced from NOAA/NCEI.