Was the forecast right for Houston on Tue Aug 18?
Houston, Texas · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
13 days out, 4 models put Houston's Tue Aug 18 high anywhere from 94° to 101°; by the final call the field had settled to a median of 97°. The day verified at 97° against the ECMWF IFS analysis, with 0.2 in of precipitation — thunderstorms.
GFS landed closest, off by 0.0°. GEM ran 2° hot.
What every model said, at every lead
Daily-high calls for Tue Aug 18 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 Houston scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-03 | — | 94° | — | — | 104° | — | — | 94–104° |
| 14d · 2026-08-04 | 96° | 98° | — | — | 104° | — | — | 96–104° |
| 13d · 2026-08-05 | 96° | 98° | 94° | — | 101° | — | — | 94–101° |
| 12d · 2026-08-06 | 94° | 100° | 96° | — | 99° | — | — | 94–100° |
| 11d · 2026-08-07 | 96° | 99° | 96° | — | 101° | — | — | 96–101° |
| 10d · 2026-08-08 | 97° | 97° | 97° | — | 104° | — | — | 97–104° |
| 9d · 2026-08-09 | 96° | 97° | 96° | — | 104° | — | — | 96–104° |
| 8d · 2026-08-10 | 96° | 99° | 98° | 100° | 100° | — | — | 96–100° |
| 7d · 2026-08-11 | 95° | 99° | 98° | 96° | 104° | — | — | 95–104° |
| 6d · 2026-08-12 | 96° | 98° | 96° | 100° | 104° | 101° | — | 96–104° |
| 5d · 2026-08-13 | 96° | 98° | 97° | 100° | 102° | 95° | 97° | 95–102° |
| 4d · 2026-08-14 | 95° | 98° | 99° | 99° | 103° | 98° | 98° | 95–103° |
| 3d · 2026-08-15 | 96° | 98° | 98° | 98° | 104° | 99° | 98° | 96–104° |
| 2d · 2026-08-16 | 95° | 98° | 96° | 100° | 103° | 97° | 98° | 95–103° |
| 1d · 2026-08-17 | 96° | 98° | 97° | 100° | 97° | 97° | 99° | 96–100° |
| 0d · 2026-08-18 | 95° | 98° | 97° | 100° | 97° | 97° | 98° | 95–100° |
| actual | 97° |
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 Houston — 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 ECMWF IFS analysis (temperature_2m_max). Archive depth varies by city; receipts exist only for dates the archive watched arrive.