Rain

local rain = {}
local maxX, maxY = term.getSize()
function newrain()
  local axis = math.random(1,2) == 1 and true or false
  local template = {
  x = axis == true and math.random(1,maxX) or maxX,
  y = axis == false and math.random(1,maxY) or 1,
  color = colors.blue,
  velo = math.random(1,4) == 4 and 2 or 1
  }
  table.insert(rain,template)
end

function redraw(bool)
  term.setBackgroundColor(bool == true and colors.white or colors.black)
  term.clear()
  for i,v in ipairs(rain) do
    term.setCursorPos(v.x,v.y)
    term.setTextColor(v.color)
    term.write("/")
    v.x = v.x - v.velo
    v.y = v.y + v.velo
    if v.y > maxX or v.x < 1 then
      table.remove(rain,i)
    end
  end
end

local boolean
local light = 0
while true do
    for i=1,3 do
        newrain()
    end
    if boolean == true then
        light = light + 1
        if light == 5 then -- Display lightning for 5 ticks
            boolean = false
            light = 0
        end
    else
        boolean = math.random(1,100) == 1 and true or false -- If the number 1 gets chosen, it sets "boolean" to true
        if boolean == true and commands then
            commands.exec("playsound ambient.weather.thunder"..math.random(1,3).." @p")
        end
    end
    redraw(boolean)
    sleep(0.01)
    if commands then
        commands.exec("playsound ambient.weather.rain @p")
    end
end