Here is a revised color palette for a 12-month calendar utilizing only five colors, with some colors repeated to cover all months.

json
{
  "palette_name": "12-Month Calendar Colors",
  "colors": [
    {
      "name": "January Blue",
      "hex_code": "
                            
                            #A2C2E3
                        "
    },
    {
      "name": "February Pink",
      "hex_code": "
                            
                            #F4B6C2
                        "
    },
    {
      "name": "March Green",
      "hex_code": "
                            
                            #B7E0B2
                        "
    },
    {
      "name": "April Yellow",
      "hex_code": "
                            
                            #F9E76D
                        "
    },
    {
      "name": "May Lavender",
      "hex_code": "
                            
                            #E8C7E8
                        "
    },
    {
      "name": "June Blue",
      "hex_code": "
                            
                            #A2C2E3
                        "
    },
    {
      "name": "July Pink",
      "hex_code": "
                            
                            #F4B6C2
                        "
    },
    {
      "name": "August Green",
      "hex_code": "
                            
                            #B7E0B2
                        "
    },
    {
      "name": "September Yellow",
      "hex_code": "
                            
                            #F9E76D
                        "
    },
    {
      "name": "October Lavender",
      "hex_code": "
                            
                            #E8C7E8
                        "
    },
    {
      "name": "November Blue",
      "hex_code": "
                            
                            #A2C2E3
                        "
    },
    {
      "name": "December Pink",
      "hex_code": "
                            
                            #F4B6C2
                        "
    }
  ]
}

This palette maintains a cohesive look while allowing for a distinct representation of each month. Would you like any suggestions on how to apply these colors in your calendar design, or do you have other requests?