Sourdough Water Temperature Chart for a 72 Degree (72°F / 22°C) Kitchen — Hand Mixing (75°F Target DDT)
4-factor Desired Dough Temperature (DDT) and mixer friction offset (+2°F) for hitting 75°F dough in a 72°F room.
Heat flows in two directions in a 72°F (22.2°C) kitchen: heat flows from the 72°F flour and levain into the dough, and hand mixing (75°f target ddt) adds +2°F of its own. To land the finished dough on 75°F, the 350g of liquid water must enter at 82°F (27.8°C). Because 68°F faucet water is already cold enough for a 75°F dough, use the full 350g as liquid at 82°F.
- Required Water Temp
- 82°F (27.8°C)To hit 75°F DDT in 72°F room
- 350g Batch Ice Split
- 0g Ice / 350g WaterBased on 68°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
DDT Reference for 72°F Kitchens — Hand Mixing (75°F Target DDT) Water & Ice Split
Calculated using 4-factor calorimetry and latent heat of fusion (144 BTU/lb / 80 cal/g) with 68°F tap water.
| Total Recipe Water | Theoretical Water Temp | Crushed Ice to Weigh | Tap Water (@ 68°F) | Resulting Final Dough Temp |
|---|---|---|---|---|
| 250g recipe water — [Baseline] | 82°F theoretical | nothing crushed | 250g from the tap at 68°F | final 75°F / 23.9°C |
| 400g recipe water — Down 50g | 82°F theoretical | nothing crushed | 400g from the tap at 68°F | final 75°F / 23.9°C |
| 350g recipe water — Up 50g | 82°F theoretical | nothing crushed | 350g from the tap at 68°F | final 75°F / 23.9°C |
| 300g recipe water — Down 100g | 82°F theoretical | nothing crushed | 300g from the tap at 68°F | final 75°F / 23.9°C |
| 500g recipe water — Up 150g | 82°F theoretical | nothing crushed | 500g from the tap at 68°F | final 75°F / 23.9°C |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this 82°F (27.8°C) baseline.
Offsetting +2°F Mixer Friction in a 72°F (22°C) Kitchen: Target 82°F Water
Latent heat of fusion is why the cooling arithmetic is not linear. Replacing 0g of the 350g of water with crushed ice removes not merely 0g × 1 cal/g of sensible heat, but 0g × 80 cal/g of phase-change heat, which is what allows a 72 degrees (22.2°C) room to be cooled into a 75°F dough.
Probe the ingredients, not the plan. Room, flour and levain each carry their own temperature in a 22.2°C (72°F) kitchen, and the 82°F (27.8°C) figure above assumes all three are at 72°F. A 3°F error in the flour alone shifts the finished dough by roughly 1°F.
Thermal Control Protocol for Hand Mixing (75°F Target DDT) in a 72°F Room
- Measure the Room First: Confirm the kitchen really is 72 deg F (22.2°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 72 deg F before mixing. Cold flour is the most common reason a 75°F target is missed in a 72 deg F (22.2°C) kitchen.
- Run the Tap Water to 82°F: Use all 350g of liquid water tempered to 82°F (27.8°C).
- Mix and Check: After hand mixing, probe the dough — it should read 75°F (±1°F) given the +2°F friction allowance.
Common Scaling & Troubleshooting Questions (82°F (27.8°C))
How accurate is the 82°F figure in practice?
Within about 1°F, provided the four inputs really are 72°F room, 72°F flour, 72°F levain and +2°F friction. Probe the finished dough to confirm and adjust your next bake.
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.
What water temperature should I use for sourdough in a 72°F kitchen with Hand Mixing (75°F Target DDT)?
Using Hand Mixing (75°F Target DDT) (+2°F friction) and targeting a 75°F final dough temperature, your theoretical water temperature is 82°F (27.8°C).