Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 86 Degree (86°F / 30°C) Kitchen — Hand Mixing (78°F Target DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 78°F dough in a hot 86°F room.
Heat flows in two directions in a 86 deg F (30°C) kitchen: heat flows from the 86 deg F flour and levain into the dough, and hand mixing (78°f target ddt) adds +2°F of its own. To land the finished dough on 78°F, the 302g of liquid water must enter at 52°F (11.1°C). Cooling from 78°F tap water down to 52°F means melting 48g of ice into the 350g batch and leaving 302g of liquid water; each gram of ice absorbs 80 cal on melting alone.
- Required Water Temp
- 52°F (11.1°C)To hit 78°F DDT in 86°F room
- 350g Batch Ice Split
- 48g Ice / 302g WBased on 78°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +2°FHand Mixing
- Target Final Dough Temp
- 78°F (25.6°C)Locks fermentation clock & protease rate
4-Factor DDT Table: 86°F Room, 78°F Target, Hand Mixing (78°F Target DDT)
The 2°F friction allowance for hand mixing (78°f target ddt) is already inside every target water temperature on this table.
| Recipe Water | Target Water Temp | Ice to Add | Water to Add (@ 78°F) | Dough Temp Achieved |
|---|---|---|---|---|
| [Baseline]: 350g total water | mix at 52°F | substitute 48g ice | keep 302g warm water | friction +2°F absorbed |
| Down 50g: 400g total water | mix at 52°F | substitute 55g ice | keep 345g warm water | friction +2°F absorbed |
| Up 50g: 300g total water | mix at 52°F | substitute 41g ice | keep 259g warm water | friction +2°F absorbed |
| Down 100g: 500g total water | mix at 52°F | substitute 68g ice | keep 432g warm water | friction +2°F absorbed |
| Up 150g: 250g total water | mix at 52°F | substitute 34g ice | keep 216g warm water | friction +2°F absorbed |
Interactive Desired Dough Temp (DDT) & Ice Solver Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
Baking Sourdough in a Hot 86°F Room: Why You Need 52°F Water (48g Ice)
The 78°F (25.6°C) target is a fermentation-speed decision, not a texture preference. A dough that lands at 52°F mix temperature in a 86 degrees (30°C) room will ferment at the rate the microbiology model assumes, and the 2°F friction allowance for hand mixing (78°f target ddt) keeps the mixing heat from stealing that budget.
Friction factors are equipment-specific. The +2°F used for hand mixing (78°f target ddt) is a lumped parameter covering the steel bowl, ambient convection, hydration exotherm and shear work, and it changes if you switch from a spiral hook to a paddle.
Thermal Control Protocol for Hand Mixing (78°F Target DDT) in a 86°F Room
- Account for the Friction First: Hand Mixing (78°F Target DDT) adds +2°F, so subtract it from your target before you calculate the water temperature — that single step is what distinguishes a 78°F dough from a warm one.
- Solve the 4-Factor Equation: 4 × 78°F − (86 + 86 + 86 + 2) = 52°F of mix water for this 86 deg F (30°C) room.
- Execute the Ice Swap: Replace 48g of the 350g with finely crushed ice and keep 302g of 78°F tap water, melting the ice fully first.
- Probe the Finished Dough: The reading should be 78°F ± 1°F; anything else means one of the three probed ingredients was off.
Frequently Asked Questions for This Desired Dough Temp (DDT) & Ice Solver Spec
How accurate is the 52°F figure in practice?
Within about 1°F, provided the four inputs really are 86°F room, 86°F flour, 86°F levain and +2°F friction. Probe the finished dough to confirm and adjust your next bake.
Do I need crushed ice or is a cold fridge fine?
Crushed ice, always. Chilling the bowl in the refrigerator removes heat far too slowly for a 350g batch; the 80 cal/g latent heat of fusion in 48g of crushed ice does the job in under a minute.
Does humidity in a 86°F (30°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.