Was the forecast right for Philadelphia on Thu Oct 15?
Philadelphia, Pennsylvania · daily high temperature in °C · forecasts from each model's archived runs, verified against the PHL observations
14 days out, 4 models put Philadelphia's Thu Oct 15 high anywhere from 14° to 27°;by the final call, the day before, the field had settled to a median of 22°. The day verified at 23° against the PHL observations — drizzle.
UKMO landed closest, off by 0.1°. AIGFS ran 2° cool.
What every model said, at every lead
Daily-high calls for Thu Oct 15 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 Philadelphia scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-09-30 | — | 13° | — | — | 22° | — | — | 13–22° |
| 14d · 2026-10-01 | 14° | 16° | 27° | — | 22° | — | — | 14–27° |
| 13d · 2026-10-02 | 20° | 15° | 20° | — | 26° | — | — | 15–26° |
| 12d · 2026-10-03 | 23° | 17° | 23° | — | 26° | — | — | 17–26° |
| 11d · 2026-10-04 | 27° | 9° | 26° | — | 20° | — | — | 9–27° |
| 10d · 2026-10-05 | 19° | 17° | 21° | — | 27° | — | — | 17–27° |
| 9d · 2026-10-06 | 17° | 23° | 15° | 20° | 19° | — | — | 15–23° |
| 8d · 2026-10-07 | 16° | 17° | 14° | 17° | 19° | — | — | 14–19° |
| 7d · 2026-10-08 | 19° | 24° | 17° | 30° | 21° | — | — | 17–30° |
| 6d · 2026-10-09 | 22° | 17° | 19° | 17° | 19° | 17° | 17° | 17–22° |
| 5d · 2026-10-10 | 23° | 20° | 20° | 18° | 20° | 19° | 24° | 18–24° |
| 4d · 2026-10-11 | 23° | 23° | 21° | 22° | 24° | 20° | 24° | 20–24° |
| 3d · 2026-10-12 | — | 21° | 22° | 23° | 23° | 22° | 22° | 21–23° |
| 2d · 2026-10-13 | 22° | 20° | 21° | 22° | 22° | 21° | 22° | 20–22° |
| 1d · 2026-10-14 | 22° | 20° | 23° | 22° | 22° | 22° | 23° | 20–23° |
| actual | 23° |
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 Philadelphia — 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 PHL 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.