Was the forecast right for Boston on Sat Oct 3?
Boston, Massachusetts · daily high temperature in °F · forecasts from each model's archived runs, verified against the BOS observations
14 days out, 4 models put Boston's Sat Oct 3 high anywhere from 57° to 74°;by the final call, the day before, the field had settled to a median of 67°. The day verified at 67° against the BOS observations — cloudy.
ICON landed closest, off by 0.4°. UKMO ran 3° warm.
What every model said, at every lead
Daily-high calls for Sat Oct 3 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 Boston scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-18 | — | 78° | — | — | 73° | — | — | 73–78° |
| 14d · 2026-09-19 | 65° | 57° | 74° | — | 61° | — | — | 57–74° |
| 13d · 2026-09-20 | 67° | 70° | 76° | — | 73° | — | — | 67–76° |
| 12d · 2026-09-21 | 71° | 69° | 68° | — | 58° | — | — | 58–71° |
| 11d · 2026-09-22 | 66° | 63° | 79° | — | 60° | — | — | 60–79° |
| 10d · 2026-09-23 | 67° | 68° | 66° | — | 71° | — | — | 66–71° |
| 9d · 2026-09-24 | 72° | 81° | 69° | 76° | 78° | — | — | 69–81° |
| 8d · 2026-09-25 | 62° | 85° | 62° | 75° | 84° | — | — | 62–85° |
| 7d · 2026-09-26 | 63° | 68° | 64° | 65° | 62° | — | — | 62–68° |
| 6d · 2026-09-27 | 67° | 70° | 63° | 68° | 64° | 68° | 64° | 63–70° |
| 5d · 2026-09-28 | 69° | 68° | 66° | 66° | 67° | 65° | 65° | 65–69° |
| 4d · 2026-09-29 | 68° | 70° | 67° | 70° | 69° | 67° | 67° | 67–70° |
| 3d · 2026-09-30 | 67° | 69° | 66° | 69° | 68° | 65° | 67° | 65–69° |
| 2d · 2026-10-01 | 66° | 69° | 66° | 68° | 67° | 67° | 67° | 66–69° |
| 1d · 2026-10-02 | 66° | 68° | 66° | 68° | 64° | 67° | 70° | 64–70° |
| actual | 67° |
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 Boston — 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 BOS observations. The actual values are the ones in hand when this receipt was settled, usually 2 days after the date; a correction published after that is not carried into it. Archive depth varies by city; receipts exist only for dates the archive watched arrive.