Was the forecast right for Philadelphia on Tue Oct 20?
Philadelphia, Pennsylvania · daily high temperature in °F · forecasts from each model's archived runs, verified against the PHL observations
14 days out, 4 models put Philadelphia's Tue Oct 20 high anywhere from 63° to 75°;by the final call, the day before, the field had settled to a median of 69°. The day verified at 71° against the PHL observations — clear.
AIFS landed closest, off by 0.0°. ECMWF ran 5° cool.
What every model said, at every lead
Daily-high calls for Tue Oct 20 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 · 2026-10-05 | — | 62° | — | — | 66° | — | — | 62–66° |
| 14d · 2026-10-06 | 75° | 63° | 66° | — | 69° | — | — | 63–75° |
| 13d · 2026-10-07 | 75° | 64° | 57° | — | 68° | — | — | 57–75° |
| 12d · 2026-10-08 | 60° | 63° | 58° | — | 63° | — | — | 58–63° |
| 11d · 2026-10-09 | 70° | 64° | 66° | — | 61° | — | — | 61–70° |
| 10d · 2026-10-10 | 71° | 61° | 68° | — | 60° | — | — | 60–71° |
| 9d · 2026-10-11 | 72° | 69° | 69° | 70° | 71° | — | — | 69–72° |
| 8d · 2026-10-12 | — | 68° | 69° | 66° | 67° | — | — | 66–69° |
| 7d · 2026-10-13 | 68° | 71° | 68° | 68° | 70° | — | — | 68–71° |
| 6d · 2026-10-14 | 71° | 69° | 66° | 68° | 69° | 70° | 62° | 62–71° |
| 5d · 2026-10-15 | 70° | 69° | 67° | 64° | 70° | 70° | 66° | 64–70° |
| 4d · 2026-10-16 | 72° | 58° | 67° | 62° | 70° | 68° | 69° | 58–72° |
| 3d · 2026-10-17 | 71° | 67° | 66° | 68° | 67° | 67° | 68° | 66–71° |
| 2d · 2026-10-18 | 70° | 68° | 66° | 69° | 69° | 68° | 67° | 66–70° |
| 1d · 2026-10-19 | 71° | 68° | 66° | 69° | 70° | 69° | 67° | 66–71° |
| 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 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.