Our forecast is the most accurate on 5 of 5 measured parameters, against every global model taken on its own.
Temperature
Mean absolute error (°C) — lower is better
- 1WASM1.26
- 2ICON · DWD1.33
- 3ECMWF1.39
- 4GFS · NOAA1.77
- 5UKMO1.86
- 6GEM · CMC2.52
5.6% better than the best single model (ICON · DWD)
393,769 matched hours · 93 stations
How the error grows as the forecast reaches further out
| 0–24 h | 25–48 h | 49–72 h | bias |
|---|
| WASM | 1.22 | 1.26 | 1.30 | -0.18 |
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| ICON · DWD | 1.28 | 1.34 | 1.38 | +0.01 |
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| ECMWF | 1.33 | 1.39 | 1.44 | -0.26 |
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| GFS · NOAA | 1.73 | 1.77 | 1.80 | +0.10 |
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| UKMO | 1.79 | 1.86 | 1.93 | -0.78 |
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| GEM · CMC | 2.46 | 2.53 | 2.58 | -1.91 |
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Relative humidity
Mean absolute error (%) — lower is better
- 1WASM7.3
- 2ECMWF8.0
- 3ICON · DWD8.1
- 4GEM · CMC10.1
- 5GFS · NOAA10.2
- 6UKMO11.3
9.2% better than the best single model (ECMWF)
393,744 matched hours · 93 stations
How the error grows as the forecast reaches further out
| 0–24 h | 25–48 h | 49–72 h | bias |
|---|
| WASM | 7.0 | 7.3 | 7.6 | +0.9 |
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| ECMWF | 7.6 | 8.1 | 8.4 | +0.3 |
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| ICON · DWD | 7.7 | 8.1 | 8.5 | +2.0 |
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| GEM · CMC | 9.8 | 10.1 | 10.3 | +3.8 |
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| GFS · NOAA | 9.9 | 10.2 | 10.4 | -6.2 |
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| UKMO | 11.1 | 11.3 | 11.4 | +4.5 |
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Wind speed
Mean absolute error (km/h) — lower is better
- 1WASM4.36
- 2ECMWF4.89
- 3UKMO4.95
- 4ICON · DWD5.07
- 5GFS · NOAA5.13
- 6GEM · CMC5.41
10.9% better than the best single model (ECMWF)
394,487 matched hours · 93 stations
How the error grows as the forecast reaches further out
| 0–24 h | 25–48 h | 49–72 h | bias |
|---|
| WASM | 4.23 | 4.35 | 4.49 | -1.54 |
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| ECMWF | 4.77 | 4.90 | 5.02 | -2.31 |
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| UKMO | 4.85 | 4.94 | 5.06 | -0.76 |
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| ICON · DWD | 4.96 | 5.07 | 5.18 | -3.25 |
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| GFS · NOAA | 5.00 | 5.14 | 5.27 | +1.06 |
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| GEM · CMC | 5.31 | 5.42 | 5.51 | -3.02 |
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Wind direction
Mean absolute error (°) — lower is better
- 1WASM36.9
- 2ICON · DWD38.5
- 3ECMWF39.1
- 4GFS · NOAA42.1
- 5UKMO42.2
- 6GEM · CMC43.6
4.1% better than the best single model (ICON · DWD)
368,257 matched hours · 93 stations
How the error grows as the forecast reaches further out
| 0–24 h | 25–48 h | 49–72 h | bias |
|---|
| WASM | 35.0 | 36.8 | 38.9 | +3.1 |
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| ICON · DWD | 36.7 | 38.4 | 40.3 | +1.9 |
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| ECMWF | 37.2 | 39.1 | 41.0 | +2.3 |
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| GFS · NOAA | 40.4 | 42.2 | 44.0 | +5.8 |
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| UKMO | 40.4 | 42.3 | 44.0 | +3.2 |
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| GEM · CMC | 42.0 | 43.7 | 45.1 | +2.1 |
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Pressure
Mean absolute error (hPa) — lower is better
- 1WASM0.72
- 2ECMWF0.72
- 3ICON · DWD0.78
- 4GFS · NOAA0.84
- 5GEM · CMC0.85
- 6UKMO0.86
Effectively level with the best single model (ECMWF)
221,111 matched hours · 52 stations · Low-elevation stations only — see the method below
How the error grows as the forecast reaches further out
| 0–24 h | 25–48 h | 49–72 h | bias |
|---|
| WASM | 0.70 | 0.71 | 0.76 | +0.18 |
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| ECMWF | 0.70 | 0.71 | 0.76 | +0.11 |
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| ICON · DWD | 0.74 | 0.77 | 0.85 | +0.28 |
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| GFS · NOAA | 0.73 | 0.83 | 0.98 | -0.28 |
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| GEM · CMC | 0.80 | 0.84 | 0.90 | +0.30 |
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| UKMO | 0.80 | 0.85 | 0.94 | +0.41 |
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