Was the forecast right for Salt Lake City on Sat Aug 29?
Salt Lake City, Utah · daily high temperature in °F · forecasts from each model's archived runs, verified against the SLC observations
9 days out, 4 models put Salt Lake City's Sat Aug 29 high anywhere from 78° to 98°;by the final call, the day before, the field had settled to a median of 76°. The day verified at 75° against the SLC observations, with 0.2 in of precipitation — showers.
AIGFS landed closest, off by 1.3°. GEM ran 7° cool.
What every model said, at every lead
Daily-high calls for Sat Aug 29 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 |
|---|---|---|---|---|---|---|---|---|
| 9d · 2026-08-20 | 78° | 79° | 95° | — | 98° | — | — | 78–98° |
| 8d · 2026-08-21 | 84° | 84° | 92° | 88° | 92° | — | — | 84–92° |
| 7d · 2026-08-22 | 75° | 84° | 92° | 90° | 95° | 86° | — | 75–95° |
| 6d · 2026-08-23 | 72° | 77° | 90° | 82° | 90° | 77° | 80° | 72–90° |
| 5d · 2026-08-24 | 72° | 79° | 86° | 76° | 81° | 78° | 85° | 72–86° |
| 4d · 2026-08-25 | 73° | 74° | 79° | 77° | 81° | 76° | 78° | 73–81° |
| 3d · 2026-08-26 | 72° | 77° | 76° | 85° | 85° | 75° | 76° | 72–85° |
| 2d · 2026-08-27 | 72° | 76° | 73° | 76° | 84° | 73° | 77° | 72–84° |
| 1d · 2026-08-28 | 73° | 76° | 72° | 68° | 79° | 78° | 79° | 68–79° |
| actual | 75° |
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.