Was the forecast right for Charlotte on Mon Sep 21?
Charlotte, North Carolina · daily high temperature in °C · forecasts from each model's archived runs, verified against the CLT observations
14 days out, 4 models put Charlotte's Mon Sep 21 high anywhere from 23° to 34°;by the final call, the day before, the field had settled to a median of 33°. The day verified at 33° against the CLT observations, with 1.3 mm of precipitation — thunderstorms.
ECMWF landed closest, off by 0.1°. UKMO ran 1° cool.
What every model said, at every lead
Daily-high calls for Mon Sep 21 as each model's runs approached it — the last archived run per day. NBM and The Spread's own blend are consensus products and stay out of these ranges and rankings; the Charlotte scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-06 | — | 22° | — | — | 26° | — | — | 22–26° |
| 14d · 2026-09-07 | 23° | 24° | 34° | — | 26° | — | — | 23–34° |
| 13d · 2026-09-08 | 17° | 31° | 32° | — | 34° | — | — | 17–34° |
| 12d · 2026-09-09 | 28° | 21° | 23° | — | 27° | — | — | 21–28° |
| 11d · 2026-09-10 | 23° | 24° | 26° | — | 20° | — | — | 20–26° |
| 10d · 2026-09-11 | 22° | 19° | 38° | — | 21° | — | — | 19–38° |
| 9d · 2026-09-12 | 31° | 22° | 29° | 30° | 26° | — | — | 22–31° |
| 8d · 2026-09-13 | 33° | 25° | 35° | 31° | 34° | — | — | 25–35° |
| 7d · 2026-09-14 | 32° | 26° | 33° | 33° | 33° | — | — | 26–33° |
| 6d · 2026-09-15 | 32° | 27° | 30° | 32° | 33° | 31° | 26° | 26–33° |
| 5d · 2026-09-16 | 32° | 29° | 34° | 32° | 34° | 32° | 25° | 25–34° |
| 4d · 2026-09-17 | 33° | 31° | 32° | 33° | 32° | 32° | 31° | 31–33° |
| 3d · 2026-09-18 | 32° | 33° | 30° | 33° | 34° | 31° | 32° | 30–34° |
| 2d · 2026-09-19 | 33° | 33° | 32° | 33° | 35° | 32° | 32° | 32–35° |
| 1d · 2026-09-20 | 32° | 33° | 33° | 33° | 34° | 32° | 32° | 32–34° |
| actual | 33° |
Read it honestly
This is one date, not a league table. A model can win a day it deserved to lose; rankings only mean something over a window. For that, see which model has been most accurate in Charlotte — or every city The Spread scores.
Forecasts are what each model's archived runs said at the time, captured at The Spread's sweep times — never reconstructed after the fact. Truth is the CLT observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.