Calculate Temperature from relative humidity and dew point

This function calculates the temperature (°C) from relative humidity (%) and dew point temperature (°C).

Usage

calcTemp(RH, DewP)

Arguments

RH

Relative Humidity (0-100%)

DewP

Td, Dew Point (°Celsius)

Value

Temp, Temperature (°Celsius)

Details

The temperature is calculated using the following equation derived from the August-Roche-Magnus approximation:

$$TempC=\frac{243.04\times\left(\frac{17.625\times DewP}{243.04+DewP}-\log\left(\frac{RH}{100}\right)\right)}{17.625+\log\left(\frac{RH}{100}\right)-\frac{17.625\times DewP}{243.04+DewP}}$$

Where:

• Temp is the calculated temperature in Celsius

• RH is the relative humidity in percent

• DewP is the dew point temperature in Celsius

See also

calcTemp for calculating temperature

calcDP for calculating dew point

calcRH_DP for calculating relative humidity from dew point

calcRH_AH for calculating relative humidity from absolute humidity

Examples

# Calculate temperature for RH of 50% and dew point of 15°C
calcTemp(50, 15)
#> [1] 26.24387

calcTemp(50, calcDP(20, 50))
#> [1] 20

head(mydata) |> dplyr::mutate(DewPoint = calcDP(Temp, RH), Temp2 = calcTemp(RH, DewPoint))
#> # A tibble: 6 × 7
#>   Site   Sensor Date                 Temp    RH DewPoint Temp2
#>   <chr>  <chr>  <dttm>              <dbl> <dbl>    <dbl> <dbl>
#> 1 London Room 1 2024-01-01 00:00:00  21.8  36.8     6.38  21.8
#> 2 London Room 1 2024-01-01 00:15:00  21.8  36.7     6.34  21.8
#> 3 London Room 1 2024-01-01 00:29:59  21.8  36.6     6.30  21.8
#> 4 London Room 1 2024-01-01 00:44:59  21.7  36.6     6.22  21.7
#> 5 London Room 1 2024-01-01 00:59:59  21.7  36.5     6.18  21.7
#> 6 London Room 1 2024-01-01 01:14:59  21.7  36.2     6.06  21.7