Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 86 Degree (86°F / 30°C) Kitchen — Stand Mixer Knead 8-Min (75°F DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 75°F dough in a hot 86°F room.
In this 86°F (30°C) room, stand mixer knead 8-min (75°f ddt) adds +14°F of mechanical friction to a dough whose flour and levain are also 86°F. The 4-factor Desired Dough Temperature equation therefore calls for mix water at 28°F (-2.2°F) to deliver a 75°F (23.9°C) dough. There is no faucet setting that reaches 28°F here, so reach for ice: 92g finely crushed plus 258g of 78°F tap water brings the batch to 75°F through 80 cal/g of latent heat.
- Required Water Temp
- 28°F (-2.2°C)To hit 75°F DDT in 86°F room
- 350g Batch Ice Split
- 92g Ice / 258g WBased on 78°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +14°FStand Mixer Knead 8-Min
- Target Final Dough Temp
- 75°F (23.9°C)Locks fermentation clock & protease rate
Water Temperature Solver: 86°F (30°C) Room, Stand Mixer Knead 8-Min (75°F DDT) (+14°F)
Assumes room, flour and levain are all at 86°F (30°C) — probe them before trusting the numbers.
| Recipe Water Weight | Required Mix Temp | Crushed Ice Weight | Tap Water (@ 78°F) | Achieved Dough Temp |
|---|---|---|---|---|
| 350g water (86°F / +14°F) [Primary] | 28°F (-2.2°C) | 92g crushed ice | 258g tap water (@ 78°F) | 75°F (23.9°C) final dough |
| 400g water (86°F / +14°F) Small Mix | 28°F (-2.2°C) | 105g crushed ice | 295g tap water (@ 78°F) | 75°F (23.9°C) final dough |
| 300g water (86°F / +14°F) Standard Mix | 28°F (-2.2°C) | 79g crushed ice | 221g tap water (@ 78°F) | 75°F (23.9°C) final dough |
| 500g water (86°F / +14°F) Oversized Mix | 28°F (-2.2°C) | 132g crushed ice | 368g tap water (@ 78°F) | 75°F (23.9°C) final dough |
| 250g water (86°F / +14°F) Double Mix | 28°F (-2.2°C) | 66g crushed ice | 184g tap water (@ 78°F) | 75°F (23.9°C) final dough |
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 86°F Room: Why You Need 28°F Water (92g Ice)
The Desired Dough Temperature equation treats the dough as a single thermal mass with four contributions. For this 86 deg F (30°C) kitchen, three of them — room, flour and levain — are each 86 deg F, and the fourth is the +14°F that stand mixer knead 8-min (75°f ddt) adds through shear. Solving for the water temperature is the only way to hit 75°F exactly.
Ice quantity and water quantity are not interchangeable views of the same thing. 92g of crushed ice is the solid portion; the 258g of tap water that accompanies it is what actually hydrates the flour. Both numbers must be weighed.
Thermal Control Protocol for Stand Mixer Knead 8-Min (75°F DDT) in a 86°F Room
- Measure the Room First: Confirm the kitchen really is 86 deg F (30°C) 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 86 deg F before mixing. Cold flour is the most common reason a 75°F target is missed in a 86 deg F (30°C) kitchen.
- Combine 92g Crushed Ice with 258g 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 stand mixer knead 8-min, probe the dough — it should read 75°F (±1°F) given the +14°F friction allowance.
Common Scaling & Troubleshooting Questions (28°F (-2.2°C))
Why is my crumb gummy even though the dough looked the right temperature?
A correct 75°F dough can still bake badly if the core never reached 208°F. Check the internal temperature with a probe rather than trusting the oven dial, and remember to cool the loaf for two hours before slicing.
How much ice do I add to 350g of bread water in a 86 deg F room (Stand Mixer Knead 8-Min (75°F DDT))?
Replace 92g of water with finely crushed ice and use 258g of 78°F tap water to hit 75°F DDT.
Why does my dough come out warmer than 75°F in a 86°F room?
Almost always the friction term. If you used 78°F faucet water instead of 28°F, the 14°F that stand mixer knead 8-min (75°f ddt) generates has nowhere to go, and the finished dough overshoots the target.