Daily forecasts v actual — WXSIM and WU scored separately
| Metric |
Today — Wed 4 Nov (so far — provisional, 18:18) |
Yesterday — Tue 3 Nov |
| Actual | WXSIM | WXSIM err | WU | WU err |
Actual | WXSIM | WXSIM err | WU | WU err |
| Maximum temperature |
68.4 °F |
72.0 °F |
+3.6 °F |
71.6 °F |
+3.2 °F |
72.7 °F |
67.9 °F |
-4.8 °F |
73.4 °F |
+0.7 °F |
| Minimum temperature |
56.8 °F |
52.3 °F |
-4.5 °F |
55.4 °F |
-1.4 °F |
57.4 °F |
52.7 °F |
-4.7 °F |
51.8 °F |
-5.6 °F |
| Rainfall |
0.130 in |
0.520 in |
+0.390 in |
0.331 in |
+0.201 in |
0.000 in |
0.010 in |
+0.010 in |
0.000 in |
0.000 in |
| Maximum sustained wind |
6.0 mph |
10.5 mph |
+4.5 mph |
12.4 mph |
+6.4 mph |
13.3 mph |
8.9 mph |
-4.4 mph |
10.6 mph |
-2.7 mph |
| Maximum gust |
6.3 mph |
17.6 mph |
+11.3 mph |
n/a |
n/a |
13.3 mph |
14.9 mph |
+1.6 mph |
n/a |
n/a |
| Maximum solar radiation |
465.0 W/m² |
163.4 W/m² |
-301.6 W/m² |
n/a |
n/a |
563.0 W/m² |
228.1 W/m² |
-334.9 W/m² |
n/a |
n/a |
| Additional metrics forecast by both |
| Mean relative humidity |
75.6 % |
77.6 % |
+2.0 % |
74.0 % |
-1.6 % |
73.3 % |
73.3 % |
0.0 % |
61.0 % |
-12.3 % |
| Mean wind direction |
192.4 ° |
184.5 ° |
7.9 ° |
181.0 ° |
11.4 ° |
222.6 ° |
183.7 ° |
38.9 ° |
175.0 ° |
47.6 ° |
| Maximum UV index |
2.9 |
1.2 |
-1.7 |
2.0 |
-0.9 |
3.5 |
1.6 |
-1.9 |
3.0 |
-0.5 |
| Minimum wind chill |
56.8 °F |
49.3 °F |
-7.5 °F |
51.8 °F |
-5.0 °F |
57.4 °F |
50.1 °F |
-7.3 °F |
51.8 °F |
-5.6 °F |
| Maximum heat index |
68.4 °F |
69.8 °F |
+1.4 °F |
71.6 °F |
+3.2 °F |
72.3 °F |
66.0 °F |
-6.3 °F |
73.4 °F |
+1.1 °F |
Reference: Actual = measured station observation. Each forecast's error is Forecast − Actual, so WXSIM and WU are judged independently against the same evidence. Yesterday uses the completed daily record; today's values are running totals/extremes so far, refreshed every 30 minutes, and will change until the day ends. WU supplies no gust or solar forecast (n/a). Wind direction errors are the shortest angular difference.
Forecast vs observed conditions — every 30 minutes
| Metric | WXSIM forecast | Actual (station observation) | WXSIM error F − A | WXSIM mean absolute error |
|---|
| Temperature |
58.5 °F |
60.6 °F |
-2.1 °F |
1.6 °F (n=491) |
| Relative humidity |
99.3 % |
90.0 % |
+9.3 % |
5.8 % (n=491) |
| Dew point |
57.8 °F |
57.7 °F |
+0.1 °F |
1.7 °F (n=491) |
| Wet bulb |
58.4 °F |
58.5 °F |
-0.1 °F |
1.2 °F (n=491) |
| Sea-level pressure |
29.85 inHg |
29.91 inHg |
-0.06 inHg |
0.05 inHg (n=491) |
| Rainfall (30 min interval) |
— |
— |
— |
— |
| Wind speed |
6.7 mph |
1.4 mph |
+5.3 mph |
2.5 mph (n=491) |
| Wind gust |
9.1 mph |
3.8 mph |
+5.3 mph |
2.7 mph (n=491) |
| Wind direction |
170.0 ° |
147.0 ° |
+23.0 ° |
71.8 ° (n=154) |
| Solar radiation |
0.0 W/m² |
0.0 W/m² |
0.0 W/m² |
47.9 W/m² (n=491) |
| UV index |
0.0 |
0.0 |
0.0 |
0.3 (n=491) |
Rainfall: WXSIM and Weather Underground values are compared as 30-minute intervals. New records use the collector's independent rainfall baseline. For compatibility with earlier Stage 2 records, the dashboard can also reconstruct a missing WU 30-minute rainfall value from consecutive saved cumulative precipTotal readings when the forecast-valid times are exactly 30 minutes apart.
Actual vs WU forecast: the "Actual" column is the measured station observation (supplied through Weather Underground) and is the reference every error is measured against. It is not a Weather Underground forecast. The WU forecast is a daily product (High, Low, Rain, Wind), so it cannot be scored every 30 minutes; WXSIM and WU are each scored separately against the same actuals on the 7-Day Comparison (Head-to-Head) and Detailed Comparison pages.
Wind direction: when the collector excludes a direction record from scoring because either wind speed is below the calm-wind threshold, the dashboard still shows the shortest angular difference for information, marked (calm). These calm-wind values are not added to the mean absolute error.