Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 92 Degree (92°F / 33°C) Kitchen — High-Friction Planetary Mixer (76°F DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 76°F dough in a hot 92°F room.
If you mix with 78°F tap water in a 92°F (33.3°C) kitchen using high-friction planetary mixer (76°f ddt), the dough will land well above 76°F and ferment far too fast. The arithmetic 4 × 76°F − (92 + 92 + 92 + 24) gives the required 4°F (-15.6°C) mix temperature instead. Your 78°F tap water is 74°F too warm for a 76°F dough, so 136g of crushed ice replaces that much of the 350g and 214g of tap water completes the mix.
- Required Water Temp
- 4°F (-15.6°C)To hit 76°F DDT in 92°F room
- 350g Batch Ice Split
- 136g Ice / 214g WBased on 78°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +24°FHigh-Friction Planetary Mixer
- Target Final Dough Temp
- 76°F (24.4°C)Locks fermentation clock & protease rate
Water Temperature Solver: 92°F (33.3°C) Room, High-Friction Planetary Mixer (76°F DDT) (+24°F)
Read the ice column as a direct instruction: weigh that much crushed ice and make up the balance with 78°F tap water.
| Total Water | Calculated Temp | Ice Quantity | Tap Water Quantity | Dough Temp Target |
|---|---|---|---|---|
| [Exact Target]: 250g total water | mix at 4°F | substitute 97g ice | keep 153g warm water | friction +24°F absorbed |
| Alt Line A: 400g total water | mix at 4°F | substitute 156g ice | keep 244g warm water | friction +24°F absorbed |
| Alt Line B: 350g total water | mix at 4°F | substitute 136g ice | keep 214g warm water | friction +24°F absorbed |
| Alt Line C: 300g total water | mix at 4°F | substitute 117g ice | keep 183g warm water | friction +24°F absorbed |
| Alt Line D: 500g total water | mix at 4°F | substitute 195g ice | keep 305g warm water | friction +24°F absorbed |
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Baking Sourdough in a Hot 92°F Room: Why You Need 4°F Water (136g Ice)
The 76°F (24.4°C) target is a fermentation-speed decision, not a texture preference. A dough that lands at 4°F mix temperature in a 92°F (33.3 Celsius) room will ferment at the rate the microbiology model assumes, and the 24°F friction allowance for high-friction planetary mixer (76°f ddt) keeps the mixing heat from stealing that budget.
The recipe's own water temperature is not the mix water temperature. If your recipe specifies water at 90°F because it was written for a 68°F kitchen, that number has to be re-solved for this 92°F (33.3°C) room and for the +24°F that high-friction planetary mixer (76°f ddt) generates.
Thermal Control Protocol for High-Friction Planetary Mixer (76°F DDT) in a 92°F Room
- Measure the Room First: Confirm the kitchen really is 33.3°C (92°F) with a thermometer on the counter, not on the window, because radiant sun can read several degrees warmer than the working surface.
- Temper Flour and Levain: Bring both to 92°F before mixing. Cold flour is the most common reason a 76°F target is missed in a 33.3°C (92°F) kitchen.
- Combine 136g Crushed Ice with 214g Tap Water: Mix the ice into the 78°F water first and let it chill completely before it touches the flour.
- Mix and Check: After high-friction planetary mixer, probe the dough — it should read 76°F (±1°F) given the +24°F friction allowance.
Frequently Asked Questions for This Desired Dough Temp (DDT) & Ice Solver Spec
Can I mix the ice directly into the flour?
Yes, and it is often the better technique. Mixing 136g of crushed ice into the 214g of water and flour together chills the mass faster than adding cold water to warm flour, and the 80 cal/g phase change is fully captured.
Does humidity in a 92°F (33.3°C) kitchen change the water temperature?
Marginally. On a humid morning the dough surface loses less moisture and cools a little less, so half a degree less cold water is usually right. Treat it as a refinement, not a correction.
How accurate is the 4°F figure in practice?
Within about 1°F, provided the four inputs really are 92°F room, 92°F flour, 92°F levain and +24°F friction. Probe the finished dough to confirm and adjust your next bake.