Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 92 Degree (92°F / 33°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 92°F room.
In this 92°F (33.3 Celsius) room, hand mixing (75°f target ddt) adds +2°F of mechanical friction to a dough whose flour and levain are also 92°F. The 4-factor Desired Dough Temperature equation therefore calls for mix water at 22°F (-5.6°F) to deliver a 75°F (23.9°C) dough. There is no faucet setting that reaches 22°F here, so reach for ice: 103g finely crushed plus 247g of 78°F tap water brings the batch to 75°F through 80 cal/g of latent heat.
- Required Water Temp
- 22°F (-5.6°C)To hit 75°F DDT in 92°F room
- 350g Batch Ice Split
- 103g Ice / 247g WBased on 78°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: 92°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 78°F tap water.
| Total Recipe Water | Theoretical Water Temp | Crushed Ice to Weigh | Tap Water (@ 78°F) | Resulting Final Dough Temp |
|---|---|---|---|---|
| Batch 250g [350g Ref] | target 22°F / -5.6°C | ice 74g | liquid 176g | lands on 75°F |
| Batch 400g 100g Lighter | target 22°F / -5.6°C | ice 118g | liquid 282g | lands on 75°F |
| Batch 350g 100g Heavier | target 22°F / -5.6°C | ice 103g | liquid 247g | lands on 75°F |
| Batch 300g Half Batch | target 22°F / -5.6°C | ice 88g | liquid 212g | lands on 75°F |
| Batch 500g Large Batch | target 22°F / -5.6°C | ice 147g | liquid 353g | lands on 75°F |
Interactive Desired Dough Temp (DDT) & Ice Solver Calculator
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Baking Sourdough in a Hot 92°F Room: Why You Need 22°F Water (103g Ice)
Liquid water absorbs 1.0 cal/g per °C of warming, whereas solid ice at 0°C (32°F) absorbs 80 cal/g (144 BTU/lb) to melt into 0°C water before warming. That phase-change heat sink counteracts a 92°F (33.3°C) room plus +2°F of hand mixing (75°f target ddt) friction when the theoretical water temperature drops to 22°F.
Ice quantity and water quantity are not interchangeable views of the same thing. 103g of crushed ice is the solid portion; the 247g 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 92°F Room
- Probe Ingredients (92°F / 33.3°C): Verify ambient room (92°F), flour, and starter temperatures with an instant-read probe thermometer before running Hand Mixing (75°F Target DDT).
- Weigh 103g Ice + 247g Tap Water: For 350g total water, combine 103g finely crushed ice with 247g (@ 78°F) faucet water.
- Verify Final 75°F Dough Temp: Probe the dough center immediately after hand mixing (+2°F friction); it should read 75°F ± 1°F.
- Record the Reading: Write the actual temperature on your recipe card — in a 92°F (33.3°C) room the next bake will need the same correction, not a fresh guess.
Frequently Asked Questions for This Desired Dough Temp (DDT) & Ice Solver Spec
How accurate is the 22°F figure in practice?
Within about 1°F, provided the four inputs really are 92°F room, 92°F flour, 92°F levain and +2°F friction. Probe the finished dough to confirm and adjust your next bake.
Does the type of mixer actually change the water temperature?
Yes, and that is exactly what the friction factor models. Hand Mixing (75°F Target DDT) contributes +2°F, so the same 92°F (33.3°C) kitchen needs a 22°F mix water for this machine and a different one for a hand-mixed dough.
Can I mix the ice directly into the flour?
Yes, and it is often the better technique. Mixing 103g of crushed ice into the 247g 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.