How our horse blanket recommendations work

Inputs and decision windows

1. Location and forecast: The app retrieves current and forecast weather from OpenWeatherMap for the selected place. National Weather Service alerts can appear alongside the forecast. An optional weather cross-check can compare other providers, but the core blanket decision uses the forecast passed into the recommendation engine.
2. Local time: Before 4 PM, the current decision runs from now through 4 PM in the location's time zone. From 4 PM onward, it runs from now through 8 AM. The app also calculates an overnight view for roughly 6 PM through 8 AM and displays upcoming day guidance.
3. Temperature and rain: The engine takes the lowest forecast “feels like” value in the current window (falling back to air temperature when needed). If the maximum forecast precipitation chance in that window reaches the rain trigger, it subtracts a configurable adjustment from that value before comparing thresholds.
4. Threshold comparison: At or below the heavy threshold, it says heavy; otherwise at or below medium, medium; otherwise at or below light, light; above light, no blanket. It may flag a different level for overnight conditions.

The default thresholds in the recommendation logic are 34°F heavy, 44°F medium and 54°F light; the rain trigger is 25% with a 10°F adjustment. Signed-in users can tune their own settings. These are product settings, not veterinary cutoffs or recommended blanket fill weights.

What “feels like” and rain adjustment mean

Forecast “feels like” is a weather-provider estimate built for people. It is a convenient proxy for exposure, not a measured equine wind-chill index. The rain adjustment is a conservative app rule: a 10°F reduction in the comparison value does not mean the air actually cooled 10°F, and a 25% forecast chance does not prove your horse will get wet.

Rain, wind and shelter matter because a wet coat loses insulation and protection from wind and moisture changes exposure. The temperature chart explains why identical air temperatures can call for different checks. Check the displayed forecast and the horse rather than treating one number as the whole answer.

What the calculator cannot see

• Whether your horse is clipped, acclimated to cold, thin, young, elderly, sick, sweating or shivering.
• Whether the horse actually has usable shelter, enough forage and water, or a dry, properly fitted blanket.
• Microclimates and forecast errors at a particular paddock; precipitation probabilities and timing can change.
• Clinical signs, body condition and the risks of overheating under a blanket.

Weather data is cached to keep the tool responsive. Check its displayed “as of” time and refresh if conditions are changing quickly. If weather is unavailable, do not assume a “no blanket” result is a safe assessment.

When to override the recommendation

Use direct observation first. Feel under an existing blanket for sweat or dampness, inspect fit and skin, check whether the coat is wet, and reassess when a front or rain arrives. A clipped, underweight or ill horse may need more protection than a forecast-only result suggests; an acclimated horse with a full coat may need less. If your horse is shivering, unusually lethargic, distressed or losing condition, contact your veterinarian for individual advice.

For broader care considerations, read when to blanket a horse. External background: University of Minnesota Extension, “Caring for your horse in the winter”. That source describes coat, moisture, shelter, feeding and lower critical temperature; it does not validate this app's numeric thresholds or rain adjustment.