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WeatherLink Data to CSV

Format and log new WeatherLink data to a local CSV file.

Purpose

  1. WeatherLink only stores a fixed amount of archive data for each station, so you are guaranteed to lose data eventually if you do not back it up. For example, my account holds up to 10240 records; a new record is added every 30 minutes, so it can only keep the most recent 213 days worth of data.
  2. On the web service, data is stored in 52 byte records with a lot of unnecessary data (e.g. soil temperature and leaf wetness are useless if you do not have the right equipment on your weather station). This program formats and stores just the data you want in a CSV.

Setup

Two files are needed for the program to function:

  1. A .weatherlink file in your home directory with your weatherlink.com account name on the first line, password on the second line, and a comma-separated list of fields that you want to exclude from the CSV (on as many additional lines as needed). A list of all of the field names is in the progdata.py file. Your dotfile might look like this:
ACCOUNT
PASSWORD
soil_moist1, soil_moist2, soil_moist3, soil_moist4
  1. A CSV file. By default, the program expects weatherlink.csv in your home directory -- simply create an empty file. You can use f FILENAME or --file=FILENAME as an argment to specify a different file.

Note: designed for data format Rev "B" (which is used in Davis firmware dated after 4/24/02). Support for older firmware may be added in the future.

Data Format

Check out explanations of each field of the data format (Rev "B") in the manufacturer's PDF.

Field Offset Size Dash Val
Date Stamp 0 2 N/A
Time Stamp 2 2 N/A
Outside Temperature 4 2 32767
High Out Temperature 6 2 -32768
Low Out Temperature 8 2 32767
Rainfall 10 2 0
High Rain Rate 12 2 0
Barometer 14 2 0
Solar Radiation 16 2 32767
Number of Wind Samples 18 2 0
Inside Temperature 20 2 32767
Inside Humidity 22 1 255
Outside Humidity 23 1 255
Average Wind Speed 24 1 255
High Wind Speed 25 1 0
Direction of Hi Wind Speed 26 1 255
Prevailing Wind Direction 27 1 255
Average UV Index 28 1 255
ET 29 1 0
High Solar Radiation 30 2 0
High UV Index 32 1 0
Forecast Rule 33 1 193
Leaf Temperature 34 2 255
Leaf Wetnesses 36 2 255
Soil Temperatures 38 4 255
Download Record Type 42 1 N/A
Extra Humidities 43 2 255
Extra Temperatures 45 3 32767 (typo?)
Soil Moistures 48 4 255