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MetPy
MetPy is a collection of tools in Python for reading, visualizing and performing calculations with weather data.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
In a similar vein, if you're looking for something super quick just to play around with, MetPy's collection of testing data has a few csv files you could quickly split up into multiple separate files. These files are primarily for internal use, so are subject to change or disappear if needed.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.