Wet Days#

The number of wet days (DD) is the largest number of days with daily precipitation amount more than 1 mm (or depending on the rain days criteria of the country), within a certain time. Usually the process counts the number of days within a year to measure the wet condition.

How it works

Calculate the number of rain days based on the threshold in a year.

Option for rain day’s threshold: 1, 2.5, 5, 10 or 20 milimeters of rainfall per day.

IF todayRAIN > 1 THEN WD == 1

WD derived from IMERG data.

About the data

Characteristic

Description

Function

Display daily WD

Variable

WD

Geographic coverage

Global 60N-60S, 180W-180E

Spatial resolution

0.1 degree ~ 11.1 km at equator

Temporal resolution

Daily

Format

GeoTIFF

Unit

Number of day

Symbology

The threshold and the symbology for the WD can follow below color codes and image.

Threshold

Hex

RGB

<50

#ffffcc #ffffcc

rgb(255,255,204)

51 - 100

#c2e699 #c2e699

rgb(194,230,153)

101 - 150

#78c679 #78c679

rgb(120,198,121)

151 - 200

#31a354 #31a354

rgb(49,163,84)

>201

#006837 #006837

rgb(0,104,55)

Data access

Global WD data available at DEC S3: s3://wbgdecinternal-ntl/climate/products/wetdays-imerg.