You must have more than 1 and less than 33 contour levels. You had a contour interval of .5 and a range of -10 to 10 yielding 40 contour levels
This plot is not dissimilar to the PNA

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Years:
1961
1962
1963
1964
1965

Dataset time range: 1948 to 2024

Dataset Information: NCEP/NCAR Reanalysis

Date submitted: 5/6/2024 at 07:29