From the heat map, we can see from the darkest colorings in the left-most column that most days had no precipitation across the entire year.
Each cell reports a numeric count, like in a standard data table, but the count is accompanied by a color, with larger counts associated with darker colorings. The example heatmap above depicts the daily precipitation distribution, grouped by month, and recorded over eleven years in Seattle, Washington. The axis variables are divided into ranges like a bar chart or histogram, and each cell’s color indicates the value of the main variable in the corresponding cell range. A heatmap (aka heat map) depicts values for a main variable of interest across two axis variables as a grid of colored squares.
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