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The header of the accompanying .stat file generated by the EnergyPlus Weather Converter gives insight to what these values mean. The heating section of the header looks like so:

Design Stat ColdestMonth    DB996   DB990   DP996   HR_DP996    DB_DP996    DP990   HR_DP990    DB_DP990    
Units   {}  {∞C}    {∞C}    {∞C}    {}  {∞C}    {∞C}    {}  {∞C}    {m/s}   {∞C}    {m/s}   {∞C}    {m/s}   {deg}   
Heating 1   -4.6    -2.6    -12.6   1.3 -0.5    -9.7    1.7 1.9 9.9 10.8    8.9 8.4 2.6 310

Which matches up to the values you would expect in the heating section of the EPW file.

DB = Dry Bulb, DP = Dew Point, HR = Relative Humidity, and the subsequent numbers refer to the percentiles.