Was the forecast right for Salt Lake City on Sun Sep 6?
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 Sun Sep 6 high anywhere from 72° to 88°; by the final call the field had settled to a median of 88°. The day verified at 89° against the SLC observations — cloudy.
GFS landed closest, off by 0.3°. AIFS ran 6° cold.
What every model said, at every lead
Daily-high calls for Sun Sep 6 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 · 2026-08-22 | — | 94° | — | — | 96° | — | — | 94–96° |
| 14d · 2026-08-23 | 72° | 81° | 84° | — | 88° | — | — | 72–88° |
| 13d · 2026-08-24 | 75° | 64° | 91° | — | 79° | — | — | 64–91° |
| 12d · 2026-08-25 | 74° | 82° | 91° | — | 78° | — | — | 74–91° |
| 11d · 2026-08-26 | 80° | 72° | 85° | — | 91° | — | — | 72–91° |
| 10d · 2026-08-27 | 72° | 77° | 91° | — | 88° | — | — | 72–91° |
| 9d · 2026-08-28 | 82° | 92° | 83° | 76° | 76° | — | — | 76–92° |
| 8d · 2026-08-29 | 89° | 92° | 76° | 87° | 94° | — | — | 76–94° |
| 7d · 2026-08-30 | 89° | 84° | 86° | 87° | 84° | — | — | 84–89° |
| 6d · 2026-08-31 | 87° | 81° | 86° | 78° | 79° | 70° | 86° | 70–87° |
| 5d · 2026-09-01 | 86° | 88° | 89° | 85° | 88° | 87° | 76° | 76–89° |
| 4d · 2026-09-02 | 85° | 81° | 86° | 79° | 89° | 82° | 84° | 79–89° |
| 3d · 2026-09-03 | 84° | 84° | 86° | 79° | 86° | 82° | 75° | 75–86° |
| 2d · 2026-09-04 | 83° | 83° | 87° | 87° | 83° | 83° | 85° | 83–87° |
| 1d · 2026-09-05 | 83° | 84° | 86° | 89° | 85° | 85° | 82° | 82–89° |
| 0d · 2026-09-06 | 83° | 86° | 88° | 88° | 89° | 88° | 85° | 83–89° |
| actual | 89° |
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.