Temperature and Humidity Readings Need a Shared Place and Time; illustrative quantitative diagram
Make a controlled comparison
Pair temperature and humidity observations from compatible conditions. A sensor in a different zone or a reading taken much earlier may not describe the same air state. The instantaneous result does not supply a universal crop target or decide a control action.
VPD Calculator (Vapor Pressure Deficit) makes the stated relationship reproducible. It cannot supply missing product information, identify a representative sample or establish a suitable site-specific management decision.
Change one input at a time
The table varies Air relative humidity (%) around the illustrative starting value while retaining the other assumptions. These are sensitivity scenarios, not a measured range or recommended settings.
| Air relative humidity (%) | Selected calculated output | Unit |
|---|---|---|
| 48 | 1.64724 | kPa |
| 60 | 1.26711 | kPa |
| 72 | 0.886978 | kPa |
Browse Biology calculators and its Gardening and crops calculators section when another measurement is needed. A related tool may use a different denominator or physical basis.
Keep the interpretation within scope
Keep Air relative humidity (%) with the selected output in the comparison record. The three alternatives do not identify which input applies to a particular site or product. A justified new observation should be recorded as new evidence, rather than choosing an input merely because its result looks convenient.
A related quantity
Daily Light Integral Calculator addresses a related part of the task. Check its own input definition before carrying a number across.
Continue with Air VPD and Leaf-to-Air Pressure Difference Are Not Always the Same for the other part of this measurement question.
Return to GreenCalc for other subjects. Keep raw observations, chosen assumptions and calculated quantities identifiable so a later revision does not overwrite the basis of the original record.
By GreenCalc · Updated 2026-11-06