Was the forecast right for Salt Lake City on Tue Sep 15?
Salt Lake City, Utah · daily high temperature in °F · forecasts from each model's archived runs, verified against the SLC observations
14 days out, 4 models put Salt Lake City's Tue Sep 15 high anywhere from 70° to 88°; by the final call the field had settled to a median of 78°. The day verified at 78° against the SLC observations — cloudy.
AIGFS landed closest, off by 0.2°. ICON ran 3° cold.
What every model said, at every lead
Daily-high calls for Tue Sep 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 Salt Lake City scoreboard shows them, labelled.
| Lead | AIFS | AIGFS | ECMWF | GEM | GFS | ICON | UKMO | Range |
|---|---|---|---|---|---|---|---|---|
| 15d · 2026-08-31 | — | 72° | — | — | 73° | — | — | 72–73° |
| 14d · 2026-09-01 | 85° | 83° | 70° | — | 88° | — | — | 70–88° |
| 13d · 2026-09-02 | 83° | 69° | 85° | — | 77° | — | — | 69–85° |
| 12d · 2026-09-03 | 91° | 83° | 69° | — | 76° | — | — | 69–91° |
| 11d · 2026-09-04 | 88° | 80° | 85° | — | 77° | — | — | 77–88° |
| 10d · 2026-09-05 | 80° | 89° | 88° | — | 84° | — | — | 80–89° |
| 9d · 2026-09-06 | 84° | 81° | 88° | 79° | 81° | — | — | 79–88° |
| 8d · 2026-09-07 | 85° | 74° | 85° | 85° | 91° | — | — | 74–91° |
| 7d · 2026-09-08 | 81° | 77° | 86° | 85° | 88° | — | — | 77–88° |
| 6d · 2026-09-09 | 81° | 77° | 82° | 86° | 79° | 84° | 83° | 77–86° |
| 5d · 2026-09-10 | 82° | 76° | 83° | 79° | 82° | 80° | 78° | 76–83° |
| 4d · 2026-09-11 | 82° | 77° | 83° | 82° | 81° | 80° | 84° | 77–84° |
| 3d · 2026-09-12 | 81° | 78° | 82° | 84° | 80° | 79° | 80° | 78–84° |
| 2d · 2026-09-13 | 81° | 79° | 84° | 80° | 82° | 82° | 82° | 79–84° |
| 1d · 2026-09-14 | 80° | 77° | 80° | 80° | 82° | 77° | 78° | 77–82° |
| 0d · 2026-09-15 | 79° | 78° | 78° | 76° | 79° | 75° | 80° | 75–80° |
| actual | 78° |
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 Salt Lake City — 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 SLC observations. Archive depth varies by city; receipts exist only for dates the archive watched arrive.