Was the forecast right for Salt Lake City on Tue Jul 21?
Salt Lake City, Utah · daily high temperature in °F · forecasts from each model's archived runs, verified against the ECMWF IFS analysis
4 days out, 7 models put Salt Lake City's Tue Jul 21 high anywhere from 90° to 98°;by the final call, the day before, the field had settled to a median of 97°. The day verified at 99° against the ECMWF IFS analysis, with 0.01 in of precipitation — drizzle.
UKMO landed closest, off by 0.9°. AIGFS ran 7° cool.
What every model said, at every lead
Daily-high calls for Tue Jul 21 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 |
|---|---|---|---|---|---|---|---|---|
| 4d · 2026-07-17 | 90° | 94° | 93° | 92° | 98° | 94° | 96° | 90–98° |
| 3d · 2026-07-18 | 90° | 93° | 96° | 96° | 97° | 94° | 99° | 90–99° |
| 2d · 2026-07-19 | 92° | 94° | 96° | 90° | 97° | 91° | 98° | 90–98° |
| 1d · 2026-07-20 | 93° | 92° | 97° | 97° | 103° | 97° | 98° | 92–103° |
| actual | 99° |
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 ECMWF IFS analysis (temperature_2m_max). 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.