How GoodDayTo judges window cleaning
Window cleaning benefits from a reliable dry period rather than a single dry moment. GoodDayTo scores every hour in the selected one-, three- or five-hour job, then checks the next three continuous forecast hours for rain. Wind, humidity and temperature also affect spray, drying and whether the job is practical outdoors.
- Rain probability
- Measured precipitation
- Wind speed
- Humidity
- Temperature and daylight
🪟 Make the result practical
- A dry job followed by a shower is usually a poor use of time.
- At least 0.5 mm of forecast rain or a 70% probability in the three hours after the job caps the result at NOT TODAY.
- At least 0.1 mm or a 40% probability in that post-clean period caps it at WAIT.
- Very strong sun on hot glass can make water dry quickly and leave marks.
- Working at height has separate safety requirements that no weather score can replace.
Why the score looks beyond the current sky
Freshly cleaned exterior glass can be spoiled quickly by rain, windblown dirt or spray. The model therefore protects the complete selected work period and checks three more continuous forecast hours after it ends. Lower humidity and manageable wind can also help drying.
A practical example
If a two-hour job is dry but 0.6 mm of rain is forecast two hours after it finishes, the post-clean cap makes the result NOT TODAY even when the working hours alone look good. A completely dry three-hour outlook leaves the weather score free to reach GO.
Temperature, sun and wind
Mild temperatures are generally easier for cleaning than very hot or very cold conditions. Strong wind can blow spray, dust and debris around and can increase risk if ladders are involved. GoodDayTo does not know whether your windows are shaded or sheltered, so product instructions and common sense still matter.
What the window-cleaning score cannot know
The app cannot assess ladder stability, reach, glass temperature, water hardness, cleaning products, local dust or pollen, building access or whether rainwater carries dirt from a roof. Treat the score as a weather-planning tool only.
What the score means
GO means the weather factors GoodDayTo measures look favourable for this activity. WAIT means conditions are mixed or another upcoming window looks better. NOT TODAY means the forecast currently contains enough unfavourable weather signals that this is a poor choice. These are planning recommendations, not guarantees or safety clearances.
Frequently asked questions
Why can a dry hour still get WAIT?
GoodDayTo checks the full selected work period plus the next three forecast hours. At least 0.5 mm of rain or a 70% probability caps the result at NOT TODAY; at least 0.1 mm or a 40% probability caps it at WAIT.
Does humidity matter?
Higher humidity can slow drying, while lower humidity can help moisture leave the glass more quickly.
Is strong sunshine always good?
No. Hot glass can dry water and cleaning solution quickly, increasing the chance of streaks or marks.
Does GO mean it is safe to use a ladder?
No. Ladder safety, ground condition and working-at-height rules are outside the weather score.
Does the score know whether my windows are sheltered?
No. A sheltered window may be easier to clean than an exposed one under the same forecast.