Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 92 Degree (92°F / 33°C) Kitchen — Stand Mixer Low Speed (78°F DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 78°F dough in a hot 92°F room.
Heat flows in two directions in a 92°F (33.3°C) kitchen: heat flows from the 92°F flour and levain into the dough, and stand mixer low speed (78°f ddt) adds +8°F of its own. To land the finished dough on 78°F, the 258g of liquid water must enter at 28°F (-2.2°C). Cooling from 78°F faucet water down to 28°F means melting 92g of ice into the 350g batch and leaving 258g of liquid water; each gram of ice absorbs 80 cal on melting alone.
- Required Water Temp
- 28°F (-2.2°C)To hit 78°F DDT in 92°F room
- 350g Batch Ice Split
- 92g Ice / 258g WBased on 78°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +8°FStand Mixer Low Speed
- Target Final Dough Temp
- 78°F (25.6°C)Locks fermentation clock & protease rate
Water Temperature Solver: 92°F (33.3°C) Room, Stand Mixer Low Speed (78°F DDT) (+8°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 |
|---|---|---|---|---|
| 350g recipe water — [Exact Target] | 28°F theoretical | 92g finely crushed | 258g from the tap at 78°F | final 78°F / 25.6°C |
| 300g recipe water — Alt Line A | 28°F theoretical | 79g finely crushed | 221g from the tap at 78°F | final 78°F / 25.6°C |
| 400g recipe water — Alt Line B | 28°F theoretical | 105g finely crushed | 295g from the tap at 78°F | final 78°F / 25.6°C |
| 250g recipe water — Alt Line C | 28°F theoretical | 66g finely crushed | 184g from the tap at 78°F | final 78°F / 25.6°C |
| 500g recipe water — Alt Line D | 28°F theoretical | 132g finely crushed | 368g from the tap at 78°F | final 78°F / 25.6°C |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this 28°F (-2.2°C) baseline.
Baking Sourdough in a Hot 92°F Room: Why You Need 28°F Water (92g Ice)
Heat capacity differences matter at the margin. Flour and water do not absorb thermal energy identically, so the lumped-parameter approach behind the 4-factor DDT equation treats them as a single averaged mass. The practical error is typically within 1°F, which is why probing the finished dough with a probe thermometer is the final check rather than the first.
Water temperature and flour temperature trade off. A 2°F cooler mix water offsets a 2°F warmer flour, but only if the correction is applied before the two meet — once the flour is wet, the system is already committed.
Thermal Control Protocol for Stand Mixer Low Speed (78°F DDT) in a 92°F Room
- Start the Night Before: In a 92°F (33.3°C) kitchen the flour will sit near room temperature overnight if you store it sealed, so re-probe it in the morning rather than trusting yesterday's reading.
- Prepare the Water Station: Get the 28°F (-2.2°C) water ready before you open the flour bag — once the flour is wet the temperature negotiation is over.
- Blend Ice and Water: Stir 92g of crushed ice into 258g of 78°F tap water until the slush is uniform, then pour over the flour.
- Record and Repeat: Note the final probe reading alongside the 92°F (33.3°C) room temperature so the next bake is a copy rather than a calculation.
Common Scaling & Troubleshooting Questions (28°F (-2.2°C))
How much colder is the water than the room in this 33.3°C (33.3°C) kitchen?
64°F below the room temperature of 33.3°C. That gap is the entire thermal load that 8°F of stand mixer low speed (78°f ddt) friction and 33.3°C ingredients impose on the mix water.
What happens if I use hot water from the kettle instead?
The dough lands above 78°F, the fermentation clock accelerates by roughly 4% per extra degree, and in a 92 degrees (33.3°C) kitchen the result is typically an over-fermented loaf that collapses in the oven.
Why does my dough come out warmer than 78°F in a 92°F room?
Almost always the friction term. If you used 78°F faucet water instead of 28°F, the 8°F that stand mixer low speed (78°f ddt) generates has nowhere to go, and the finished dough overshoots the target.