Separate the measurements before comparing days
Relative humidity describes moisture relative to what the air can hold at its current temperature. Dew point describes a temperature associated with that moisture. They are useful context, but this page does not turn either into a universal safe running band or an exact pace adjustment.
The NWS heat tools distinguish heat index from WBGT and explain their different inputs. The app’s feels-like value is not automatically either of those measures. Read the units and label rather than assuming every number headed apparent or feels-like is interchangeable.
Avoid counting the same heat effect twice
The existing model receives apparent temperature from the weather provider. Adding an invented humidity penalty on top would change the scorer and could double-count part of the same effect. This explorer deliberately keeps the original calculation. Try changing humidity alone, then change feels-like to see the difference.
A humid session can still deserve a more cautious plan even if this simplified score changes little. The model does not know individual acclimatisation, effort or a runner’s response to the conditions. Use official heat guidance and practical route options, not a precise-looking dew-point chart with no demonstrated basis.
Worked examples from the existing scorer
These complete hypothetical hours run through the same scoring functions used by the live tool. They are not observations or forecasts. The displayed effective score includes any cap.
| Example | Effective score | Verdict | Model reasons |
|---|---|---|---|
| Humidity 40%, feels-like 24°C | 100/100 | GO | No model penalties |
| Humidity 90%, same feels-like | 100/100 | GO | No model penalties |
| Higher supplied feels-like | 64/100 | MAYBE | very hot · MAYBE cap |
Exact example inputs and units
temp and feels: °C; wind and gust: km/h; precipitation: mm/h; visibility: m; rain probability, cloud and humidity: %. Weather code is WMO; UV is an index. Pressure, where shown, is context in hPa and does not affect this scorer.
[
{
"example": "Humidity 40%, feels-like 24°C",
"inputs": {
"temp": 23,
"feels": 24,
"precip": 0,
"pop": 0,
"wind": 10,
"gust": 15,
"vis": 20000,
"code": 0,
"cloud": 10,
"humidity": 40,
"uv": 0,
"pressure": 1010
}
},
{
"example": "Humidity 90%, same feels-like",
"inputs": {
"temp": 23,
"feels": 24,
"precip": 0,
"pop": 0,
"wind": 10,
"gust": 15,
"vis": 20000,
"code": 0,
"cloud": 10,
"humidity": 90,
"uv": 0,
"pressure": 1010
}
},
{
"example": "Higher supplied feels-like",
"inputs": {
"temp": 27,
"feels": 29,
"precip": 0,
"pop": 0,
"wind": 10,
"gust": 15,
"vis": 20000,
"code": 0,
"cloud": 10,
"humidity": 90,
"uv": 0,
"pressure": 1010
}
}
]Planning bands and the limits of the number
The existing model starts at 100, subtracts its condition penalties and applies critical caps. GO is 70–100, MAYBE 45–69 and NO-GO 0–44. A MAYBE cap limits the effective score to 64, and a NO-GO cap to 40. These are application suitability bands, not certified safe operating limits.
Rain branches are alternatives: matching probability, intensity and weather-code triggers do not mean adding the same rain penalty repeatedly. Separate factors can combine. A cap prevents benign temperature or dry weather from cancelling a critical flagged condition. Use the reasons beside the result to understand what changed.
The model requires complete numeric weather inputs. Missing visibility, rain probability or another required value returns Insufficient data; it is never filled with an invented favourable value. Local warnings, closures, equipment instructions and actual observations can change your decision even when the model returns GO.
Read the full running methodology and thresholds. The model and these examples were cross-checked on 18 October 2026. No physical field-test or safety certification is claimed.
Equipment and an alternative plan
Compare the full heat forecast, choose a cooler or shorter session when appropriate and keep the option to stop nearby. Use sun protection and follow official heat advice. No humidity value on this page establishes an individual training prescription or guarantees tolerance.
Questions about Dew point and humidity for runners: what the score can tell you
Does higher humidity always lower this score?
Not independently when feels-like and the other inputs are held fixed.
Where is the dew-point pace calculator?
There is none. The existing scorer does not support that claim.
Why is humidity still required?
The model’s shared input checks require a complete weather record before returning a verdict.
Sources and limits
The numeric application bands come from the existing GoNoGo scorer and methodology. External guidance is linked for its stated context; it is not presented as endorsement of this model.
Live forecast data is supplied by Open-Meteo. An illustrative model output is different from a live forecast, and a forecast is different from a local observation.