Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 80 Degree (80°F / 27°C) Kitchen — Hand Mixing (75°F Target DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 75°F dough in a hot 80°F room.
Target a 75°F (23.9°C) dough, account for a 80 degrees (26.7°C) room plus 80 degrees flour and levain, then add the +2°F of heat that hand mixing (75°f target ddt) generates: 4 × 75°F − (80 + 80 + 80 + 2) = 58°F of mix water. Blending 34g of crushed ice with 316g of 76°F water is how you reach 58°F in this kitchen; the phase change alone strips 80 cal per gram before the water even warms.
- Required Water Temp
- 58°F (14.4°C)To hit 75°F DDT in 80°F room
- 350g Batch Ice Split
- 34g Ice / 316g WBased on 76°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +2°FHand Mixing
- Target Final Dough Temp
- 75°F (23.9°C)Locks fermentation clock & protease rate
4-Factor DDT Table: 80°F Room, 75°F Target, Hand Mixing (75°F Target DDT)
Calculated using 4-factor calorimetry and latent heat of fusion (144 BTU/lb / 80 cal/g) with 76°F tap water.
| Total Recipe Water | Theoretical Water Temp | Crushed Ice to Weigh | Tap Water (@ 76°F) | Resulting Final Dough Temp |
|---|---|---|---|---|
| 400g recipe water — [Baseline] | 58°F theoretical | 38g finely crushed | 362g from the tap at 76°F | final 75°F / 23.9°C |
| 350g recipe water — Down 50g | 58°F theoretical | 34g finely crushed | 316g from the tap at 76°F | final 75°F / 23.9°C |
| 250g recipe water — Up 50g | 58°F theoretical | 24g finely crushed | 226g from the tap at 76°F | final 75°F / 23.9°C |
| 500g recipe water — Down 100g | 58°F theoretical | 48g finely crushed | 452g from the tap at 76°F | final 75°F / 23.9°C |
| 300g recipe water — Up 150g | 58°F theoretical | 29g finely crushed | 271g from the tap at 76°F | final 75°F / 23.9°C |
Live Parameter Solver for Summer Sourdough Crushed Ice & Water Temp
Dial in custom baker's percentages and export your adjusted 58°F (14.4°C) formula for bake day.
Baking Sourdough in a Hot 80°F Room: Why You Need 58°F Water (34g Ice)
The Desired Dough Temperature equation treats the dough as a single thermal mass with four contributions. For this 80 deg F (26.7°C) kitchen, three of them — room, flour and levain — are each 80 deg F, and the fourth is the +2°F that hand mixing (75°f target 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. 34g of crushed ice is the solid portion; the 316g of tap water that accompanies it is what actually hydrates the flour. Both numbers must be weighed.
Thermal Control Protocol for Hand Mixing (75°F Target DDT) in a 80°F Room
- Account for the Friction First: Hand Mixing (75°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 75°F dough from a warm one.
- Solve the 4-Factor Equation: 4 × 75°F − (80 + 80 + 80 + 2) = 58°F of mix water for this 80°F (26.7°C) room.
- Execute the Ice Swap: Replace 34g of the 350g with finely crushed ice and keep 316g of 76°F faucet water, melting the ice fully first.
- Probe the Finished Dough: The reading should be 75°F ± 1°F; anything else means one of the three probed ingredients was off.
Cereal Chemistry & Bench Execution FAQs
What if my kitchen is warmer than 80°F on the day I bake?
Recalculate rather than adjusting by feel. Every extra degree of room temperature demands roughly one degree less from the mix water, and in a warm room the 58°F figure can drop below freezing, at which point the ice route becomes unavoidable.
Why does my dough come out warmer than 75°F in a 80°F room?
Almost always the friction term. If you used 76°F faucet water instead of 58°F, the 2°F that hand mixing (75°f target ddt) generates has nowhere to go, and the finished dough overshoots the target.
What is the DDT formula for a 80°F kitchen using Hand Mixing?
Target water temperature = (4 × 75°F) − (80°F room + 80°F flour + 80°F levain + 2°F friction) = 58°F (14.4°C).