Was the forecast right for Boston on Mon Oct 5?
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 Mon Oct 5 high anywhere from 62° to 74°;by the final call, the day before, the field had settled to a median of 68°. The day verified at 71° against the BOS observations — drizzle.
GEM landed closest, off by 0.6°. UKMO ran 4° cool.
What every model said, at every lead
Daily-high calls for Mon Oct 5 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 · 2026-09-20 | — | 70° | — | — | 70° | — | — | 70–70° |
| 14d · 2026-09-21 | 62° | 63° | 74° | — | 63° | — | — | 62–74° |
| 13d · 2026-09-22 | 69° | 70° | 68° | — | 68° | — | — | 68–70° |
| 12d · 2026-09-23 | 67° | 63° | 66° | — | 60° | — | — | 60–67° |
| 11d · 2026-09-24 | 64° | 79° | 61° | — | 74° | — | — | 61–79° |
| 10d · 2026-09-25 | 60° | 58° | 61° | — | 67° | — | — | 58–67° |
| 9d · 2026-09-26 | 62° | 73° | 56° | 60° | 70° | — | — | 56–73° |
| 8d · 2026-09-27 | 68° | 67° | 61° | 63° | 56° | — | — | 56–68° |
| 7d · 2026-09-28 | 62° | 67° | 67° | 62° | 66° | — | — | 62–67° |
| 6d · 2026-09-29 | 67° | 65° | 69° | 60° | 66° | 62° | 66° | 60–69° |
| 5d · 2026-09-30 | 67° | 68° | 68° | 61° | 66° | 67° | 69° | 61–69° |
| 4d · 2026-10-01 | 67° | 69° | 67° | 67° | 70° | 67° | 68° | 67–70° |
| 3d · 2026-10-02 | 67° | 70° | 69° | 69° | 69° | 71° | 68° | 67–71° |
| 2d · 2026-10-03 | 68° | 67° | 68° | 70° | 67° | 70° | 68° | 67–70° |
| 1d · 2026-10-04 | 69° | 68° | 68° | 70° | 68° | 70° | 68° | 68–70° |
| actual | 71° |
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.