Hambden Weather — WXSIM & WU Forecast vs Actual

Forecast initialized

2026-11-01 05:00

Forecast frozen

2026-11-01 07:00:01

Actual observations

3 of 7 days

+ today so far (provisional), updated 18:18

Actuals last updated

2026-11-04 11:00

WU forecast captured

2026-11-01 07:00:02

WU forecast status

7 of 7 days frozen — complete

Comparison:

WXSIM FORECAST

WU FORECAST

ACTUAL

WXSIM values come from latest.csv, frozen at capture. WU values come from the Weather Underground 5-day forecast: days 1–6 frozen on the start-day morning, day 7 added from the next morning's forecast. Actuals are Weather Underground PWS observations: completed days are written from 06:00 the following morning. Pale bars (*) are provisional: today's running values, or a completed day awaiting its 06:00 daily record. They refresh every 30 minutes and are not scored.

WXSIM v Weather Underground — Head-to-Head

Variable	Days compared	WXSIM mean abs. error	WU mean abs. error	Closer forecast
Maximum temperature	3	3.5 °F	3.1 °F	WU
Minimum temperature	3	3.1 °F	4.6 °F	WXSIM
Rainfall	3	0.02 in	0.00 in	WU
Maximum sustained wind	3	3.5 mph	1.9 mph	WU
Additional metrics forecast by both (mean absolute error; not included in the average error % below)
Mean relative humidity	3	4 %	5 %	WXSIM
Maximum UV index	3	1.7	1.3	WU
Mean wind direction	3	49 °	46 °	WU
Minimum wind chill	3	4.2 °F	4.3 °F	WXSIM
Maximum heat index	3	4.5 °F	2.6 °F	WU
Average error % (same days & variables)		49.3%	13.5%	WU

Only days on which WXSIM, WU and the actual observation all exist are scored, so both forecasts are compared on identical ground. The average error % uses High, Low, Rain and Wind. The WU daily forecast has no gust, solar radiation, dew point, wet bulb or pressure values, so those remain WXSIM-only.

Maximum & Minimum Temperature

WXSIM and WU forecasts versus actual daily temperature (°F)

Rainfall

WXSIM and WU forecasts versus actual daily total (in)

Maximum Sustained Wind

WXSIM and WU forecasts versus actual (mph)

Maximum Wind Gust

WXSIM forecast versus actual — the WU daily forecast does not include gusts (mph)

WU forecast: not available — the Weather Underground 5-day forecast contains no gust values

Maximum Solar Radiation

WXSIM forecast versus actual daily maximum — not included in the WU daily forecast (W/m²)

WU forecast: not available — the Weather Underground 5-day forecast contains no solar radiation values

Additional Metrics — forecast by both WXSIM and WU

Actuals are the station's daily record; pale bars (*) are provisional and refreshed every 30 minutes.

Mean Relative Humidity

WXSIM and WU forecasts versus actual (%)

Maximum UV Index

WXSIM and WU forecasts versus actual (index)

Mean Wind Direction

WXSIM and WU forecasts versus actual (°)

Minimum Wind Chill

WXSIM and WU forecasts versus actual (°F)

Maximum Heat Index

WXSIM and WU forecasts versus actual (°F)

7-Day Values

Date	High °F					Low °F					Rain in					Wind mph					Gust mph			Solar W/m²			Daily Error %
Date	WXSIM	WU	Actual	WXSIM Err %	WU Err %	WXSIM	WU	Actual	WXSIM Err %	WU Err %	WXSIM	WU	Actual	WXSIM Err %	WU Err %	WXSIM	WU	Actual	WXSIM Err %	WU Err %	WXSIM	Actual	Error %	WXSIM	Actual	Error %	WXSIM	WU
Sun 1 Nov	66.4	68.0	66.6	0.5%	4.1%	48.1	42.8	46.2	12.4%	27.3%	0.00	0.00	0.00	0.0%	0.0%	5.3	6.8	9.7	58.6%	34.6%	10.8	9.9	8.9%	253.9	527.0	69.9%	25.1%	16.5%
Mon 2 Nov	64.1	62.6	69.6	15.8%	20.6%	52.0	50.0	54.7	12.6%	23.0%	0.05	0.00	0.00	200.0%	0.0%	7.9	9.3	9.6	19.1%	2.6%	15.1	9.6	44.8%	245.2	602.0	84.2%	62.8%	11.6%
Tue 3 Nov	67.9	73.4	72.7	12.5%	1.8%	52.7	51.8	57.4	20.3%	24.7%	0.01	0.00	0.00	200.0%	0.0%	8.9	10.6	13.3	39.6%	22.9%	14.9	13.3	11.4%	228.1	563.0	84.7%	61.4%	12.3%
Wed 4 Nov	72.0	71.6	68.4*	—	—	52.3	55.4	56.8*	—	—	0.52	0.33	0.13*	—	—	10.5	12.4	6.0*	—	—	17.6	6.3*	—	163.4	465.0*	—	—	—
Thu 5 Nov	61.3	60.8	—	—	—	55.6	48.2	—	—	—	0.68	0.19	—	—	—	9.8	9.3	—	—	—	16.4	—	—	119.0	—	—	—	—
Fri 6 Nov	56.0	51.8	—	—	—	48.7	41.0	—	—	—	1.00	0.18	—	—	—	6.7	8.7	—	—	—	14.4	—	—	76.1	—	—	—	—
Sat 7 Nov	52.5	48.2	—	—	—	47.4	41.0	—	—	—	0.39	0.01	—	—	—	9.5	8.1	—	—	—	16.5	—	—	95.8	—	—	—	—
Average error for completed days in this forecast period																											49.7%	13.5%

Error % uses a symmetric forecast-versus-actual percentage difference (0% = exact match; maximum 200%). WXSIM Daily Error % is the mean of the available High, Low, Rain, Wind, Gust and Solar errors; WU Daily Error % is the mean of High, Low, Rain and Wind (WU supplies no gust or solar forecast) — use the Head-to-Head panel for a like-for-like comparison. pending = WU day 7 awaiting the next morning's capture; * = provisional — today so far, or a completed day awaiting its 06:00 daily record (refreshed every 30 minutes, not scored); n/c = not captured (date had passed before WU capture began). Temperature percentages near freezing (0 °C / 32 °F) can appear large and should be interpreted as a comparative forecast-error indicator.

Frozen WXSIM latest.csv and Weather Underground 5-day forecasts compared with Weather Underground PWS observations.
Archive: 2026-11-01.json | WU archive: wu_weeks/2026-11-01.json | Display units: imperial | Station timezone: America/New_York
WXSIM CSV Forecast vs Weather Underground Actuals — developed by MillbankPWS, Munlochy, Scotland

Hambden Weather — WXSIM & Weather Underground Forecasts vs Actual Weather

WXSIM v Weather Underground — Head-to-Head

Additional Metrics — forecast by both WXSIM and WU

7-Day Values