Dry Days#

The number of dry days (DD) is the largest number of days with daily precipitation amount less 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 dry 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 DD == 0

DD derived from IMERG data.

About the data

Characteristic

Description

Function

Display daily DD

Variable

DD

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 DD can follow below color codes and image.

Threshold

Hex

RGB

<50

#ffffd4 #ffffd4

rgb(255,255,212)

51 - 100

#fed98e #fed98e

rgb(254,217,142)

101 - 150

#fe9929 #fe9929

rgb(254,153,41)

151 - 200

#d95f0e #d95f0e

rgb(217,95,14)

>201

#993404 #993404

rgb(153,52,4)

Data access

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