Was the forecast right for Salt Lake City on Wed Sep 30?
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 Wed Sep 30 high anywhere from 66° to 76°;by the final call, the day before, the field had settled to a median of 72°. The day verified at 76° against the SLC observations — clear.
AIFS landed closest, off by 1.9°. AIGFS ran 5° cool.
What every model said, at every lead
Daily-high calls for Wed Sep 30 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 · 2026-09-15 | 60° | 71° | — | — | 77° | — | — | 60–77° |
| 14d · 2026-09-16 | 69° | 71° | 76° | — | 66° | — | — | 66–76° |
| 13d · 2026-09-17 | 78° | 58° | 70° | — | 69° | — | — | 58–78° |
| 12d · 2026-09-18 | 77° | 84° | 84° | — | 79° | — | — | 77–84° |
| 11d · 2026-09-19 | 79° | 83° | 82° | — | 68° | — | — | 68–83° |
| 10d · 2026-09-20 | 75° | 75° | 82° | — | 88° | — | — | 75–88° |
| 9d · 2026-09-21 | 78° | 66° | 79° | 78° | 79° | — | — | 66–79° |
| 8d · 2026-09-22 | 80° | 75° | 83° | 73° | 81° | — | — | 73–83° |
| 7d · 2026-09-23 | 72° | 72° | 74° | 73° | 76° | 75° | — | 72–76° |
| 6d · 2026-09-24 | 75° | 72° | 75° | 71° | 72° | 78° | 74° | 71–78° |
| 5d · 2026-09-25 | 75° | 71° | 76° | 71° | 74° | 74° | 73° | 71–76° |
| 4d · 2026-09-26 | 74° | 71° | 74° | 67° | 73° | 70° | 73° | 67–74° |
| 3d · 2026-09-27 | 75° | 70° | 72° | 71° | 72° | 71° | 73° | 70–75° |
| 2d · 2026-09-28 | 74° | 70° | 72° | 74° | 73° | 71° | 74° | 70–74° |
| 1d · 2026-09-29 | 74° | 71° | 72° | 72° | 73° | 72° | 73° | 71–74° |
| actual | 76° |
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. 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.