Was the forecast right for New York on Mon Aug 17?
New York, New York · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
13 days out, 4 models put New York's Mon Aug 17 high anywhere from 67° to 88°; by the final call the field had settled to a median of 83°. The ECMWF IFS analysis says the day verified at 80° with 0.28 in of precipitation — showers.
ICON landed closest, off by 0.1°. GFS ran 6° hot.
What every model said, at every lead
Daily-high calls for Mon Aug 17 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 New York scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-02 | — | 85° | — | — | 85° | — | — | 85–85° |
| 14d · 2026-08-03 | 88° | 76° | — | — | 79° | — | — | 76–88° |
| 13d · 2026-08-04 | 75° | 67° | 88° | — | 77° | — | — | 67–88° |
| 12d · 2026-08-05 | 79° | 70° | 73° | — | 76° | — | — | 70–79° |
| 11d · 2026-08-06 | 75° | 74° | 81° | — | 75° | — | — | 74–81° |
| 10d · 2026-08-07 | 76° | 80° | 84° | — | 84° | — | — | 76–84° |
| 9d · 2026-08-08 | 81° | 78° | 80° | — | 74° | — | — | 74–81° |
| 8d · 2026-08-09 | 79° | 78° | 87° | 73° | 74° | — | — | 73–87° |
| 7d · 2026-08-10 | 80° | 89° | 80° | 84° | 86° | — | — | 80–89° |
| 6d · 2026-08-11 | 85° | 89° | 92° | 86° | 87° | 87° | — | 85–92° |
| 5d · 2026-08-12 | 84° | 85° | 90° | 80° | 87° | 84° | 90° | 80–90° |
| 4d · 2026-08-13 | 87° | 88° | 88° | 85° | 87° | 89° | 88° | 85–89° |
| 3d · 2026-08-14 | 86° | 82° | 88° | 82° | 77° | 83° | 89° | 77–89° |
| 2d · 2026-08-15 | 85° | 85° | 86° | 78° | 85° | 81° | 86° | 78–86° |
| 1d · 2026-08-16 | 83° | 85° | 81° | 82° | 86° | 79° | 82° | 79–86° |
| 0d · 2026-08-17 | 83° | 85° | 83° | 83° | 86° | 80° | 81° | 80–86° |
| actual | 80° |
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 New York — 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.