Dew point estimate
Liquid-water convention; below-freezing frost point differs.
Weather and environmental observations ↗Weather and environmental observations calculators
25 calculators. Search or choose one below.
Calculators
Relative humidity from dew point
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Absolute humidity
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Vapour pressure deficit
Air VPD only; leaf temperature may differ.
Weather and environmental observations ↗Wet-bulb temperature estimate
Sea-level empirical estimate, restricted here to 0–50°C and 5–99% RH.
Weather and environmental observations ↗Heat index reference
Reference estimate for shade/light wind, not exposure guidance.
Weather and environmental observations ↗Wind chill reference
Reference estimate; no frostbite exposure-time prediction.
Weather and environmental observations ↗Humid air mixing ratio
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Station pressure sea-level reduction
User supplies mean layer virtual temperature.
Weather and environmental observations ↗Barometric altitude difference
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Wind rose frequency bins
Sample-frequency joint wind rose, not duration-weighted; calm observations remain included in denominator.
Weather and environmental observations ↗Mean wind vector
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Rain gauge calibration
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Snow water equivalent
Assumes uniform sampled density; no avalanche or roof-load conclusion.
Weather and environmental observations ↗Rainfall intensity duration
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Rainfall return period plotting
Plotting positions, not an extreme-value flood frequency fit.
Weather and environmental observations ↗Air quality averaging window
Equally scheduled point-sample rolling mean, not duration-weighted irregular sampling or regulatory AQI compliance.
Weather and environmental observations ↗Sensor missing-data coverage
Uniform expected schedule, timestamp matching with entered tolerance; outage duration counts missing slots, not time between successful records.
Weather and environmental observations ↗Environmental baseline anomaly
Calculation uses the entered values and stated mathematical model; quantities must use the labelled units.
Weather and environmental observations ↗Temperature lapse adjustment
User-specified linear atmosphere; inversions and local weather excluded.
Weather and environmental observations ↗Cloud base estimate
Rough parcel estimate, not cloud observations or aviation clearance.
Weather and environmental observations ↗Meteorological visibility extinction
Homogeneous atmosphere; ideal dark target on bright background.
Weather and environmental observations ↗Sound exposure energy average
Energy average only; no occupational dose or legal compliance classification.
Weather and environmental observations ↗Daylight duration geometric
No refraction, solar disc radius, terrain or civil twilight.
Weather and environmental observations ↗Surface runoff volume scenario
Lumped event-volume scenario, not peak flow or drainage design.
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