From the National Integrated Drought Information System. Their webpage has some good reference information about how this data is collected and distributed. Here are our local Zip Codes around Clary Lake: Whitefield: 04353 Jefferson: 04348
From the National Integrated Drought Information System website:
How is the drought intensity determined?
The base level is set by the US Drought Monitor drought intensity category at the center of a zip code. If only the Drought Monitor were used, the intensity needle would point to the center of each category. However, additional information is included from the Palmer Drought Severity Index (PDSI). If the PDSI within the climate division housing the zip code represents drier conditions than we would normally expect for a particular US Drought Monitor intensity category, the needle on the image is moved a half category clockwise, indicating more intense conditions. If the PDSI show more moist conditions that we would expect within a US Drought Monitor intensity category, the needle is moved one-half category counterclockwise, indicating less intense conditions. Temperature and Precipitation data for the previous day are also shown for the stations closest to the center of the zip code.