Secondary-school athletics overlay using the NATA 2015 / Korey Stringer Institute regional WBGT activity-modification chart (Grundstein et al. 2015 regional categories), with Category 1 cutoffs as printed by NYSPHSAA (2023) and VPA and Category 2 and Category 3 cutoffs as printed by the OSSAA 2025-26 Extreme Heat Policy. An athletics overlay, not an occupational work/rest rule.
Browse all standards → · Evaluate every standard at once in the calculator →
The drag-to-check calculator needs JavaScript. Every value it can show is a row of the table below, which is computed by the same engine.
No standalone formula is published for this standard; see programmable logic and parameters below.
| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | Green | Green | Green | Green |
| 25 | Yellow | Yellow | Yellow | Yellow |
| 26 | Yellow | Yellow | Yellow | Yellow |
| 27 | Yellow | Yellow | Yellow | Yellow |
| 28 | Orange | Orange | Orange | Orange |
| 29 | Red | Red | Red | Red |
| 30 | Red | Red | Red | Red |
| 31 | Stop work | Stop work | Stop work | Stop work |
| 32 | Stop work | Stop work | Stop work | Stop work |
| 33 | Stop work | Stop work | Stop work | Stop work |
| 34 | Stop work | Stop work | Stop work | Stop work |
| 35 | Stop work | Stop work | Stop work | Stop work |
| 36 | Stop work | Stop work | Stop work | Stop work |
This standard's declared inputs do not include acclimatization status, so results do not vary by it.
| Parameter | Value |
|---|---|
category2WbgtF |
|
category3WbgtF |
|
rapidCoolingWbgtF | 82 |
maxPracticeHours | orange 2 · red 1 |
Required inputs: wbgtC
Optional inputs: wbgtRegionCategory
This standard was added to the calculator.
Get notified when NATA / KSI Regional WBGT Activity Modification for Secondary-School Athletics (Grundstein 2015 Categories 1-3) changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
Paste this address into any feed reader:
https://heatrules.com/standards/nata_ksi_regional_wbgt/feed.xml
Open the feed · All update feeds · No account or email address is needed; the site keeps no subscriber list.
If a threshold, trigger, exemption, date or duty here disagrees with the governing text, tell us and point at the section. The form arrives with this standard already named, and a correction is checked against the same primary document it was encoded from.