CLIMATE-907 - Fix VisibleDeprecationWarning's in ocw.tests.test_dataset_processor.TestTemporalSubset
CLIMATE-907 - Fix VisibleDeprecationWarning's in ocw.tests.test_dataset_processor.TestTemporalSubset

- By applying int() to central_index, the warning has been addressed.

Omkar20895/climate,lewismc/climate,apache/climate,Omkar20895/climate,agoodm/climate,lewismc/climate,apache/climate,agoodm/climate,lewismc/climate,Omkar20895/climate,agoodm/climate,apache/climate,agoodm/climate,lewismc/climate,apache/climate,lewismc/climate,apache/climate,Omkar20895/climate,agoodm/climate,Omkar20895/climate