diff --git a/src/main.lua b/src/main.lua
index b783856..112a70c 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -74,11 +74,11 @@ love.draw = function()
 
   for x = 1, map.size do
     for y = 1, map.size do
-      -- local value = map.biome[x][y]
-      local value = map.temperature[x][y]
+      local value = map.biome[x][y]
+      -- local value = map.temperature[x][y]
       if value then
-        -- love.graphics.setColor(value)
-        love.graphics.setColor( (value + map.temperature.max) / (map.temperature.max + math.abs(map.temperature.min)) , 0, 0, 1)
+        love.graphics.setColor(value)
+        -- love.graphics.setColor( (value + map.temperature.max) / (map.temperature.max + math.abs(map.temperature.min)) , 0, 0, 1)
         love.graphics.rectangle("fill", x * map.tile_size, y * map.tile_size, map.tile_size, map.tile_size)
       end
     end
@@ -90,6 +90,8 @@ love.keypressed = function(key)
     love.event.quit()
   elseif key == "r" then
     love.load()
+  elseif key == "t" then
+    print(running_average.count("minT"))
   elseif key == "=" then
     map.tile_size = map.tile_size * 2
   elseif key == "-" then
diff --git a/src/map_nextgen.lua b/src/map_nextgen.lua
index 84782a4..1d2f3d5 100644
--- a/src/map_nextgen.lua
+++ b/src/map_nextgen.lua
@@ -5,6 +5,13 @@ local simplex_map = require "lib.simplex_map"
 
 local biomes = {
   -- biomes are checked in order, with the first candidate always being selected
+  [800] = {
+    name = "sea ice",
+    altitude = {min = -math.huge, max = 0},
+    temperature = {min = -math.huge, max = -2},
+    rainfall = {min = -math.huge, max = math.huge},
+    color = {0.6, 0.6, 1, 1},
+  },
   [900] = {
     name = "deep ocean",
     altitude = {min = -math.huge, max = -5000},
@@ -19,6 +26,13 @@ local biomes = {
     rainfall = {min = -math.huge, max = math.huge},
     color = {0, 0, 0.5, 1},
   },
+  [1500] = {
+    name = "frozen (definition, 0 C)",
+    altitude = {min = -math.huge, max = math.huge},
+    temperature = {min = -math.huge, max = 0},
+    rainfall = {min = -math.huge, max = math.huge},
+    color = {1, 1, 1, 1},
+  },
   [2000] = {
     name = "snowline (middle estimate)",
     altitude = {min = 4000, max = math.huge},
@@ -59,8 +73,8 @@ local generate = function()
   }
   map.temperature = simplex_map.generate{   -- in celsius
     -- -20 to 45 chosen by looking at the temperature range shown on https://openclimatemap.org/
-    size = map.size, scale = 0.005, min = -20, max = 45, -- approximate target extremes of -89.2 to 56.7
-    octaves = 1, lacunarity = 2, gain = 0.5,
+    size = map.size, scale = 0.005, min = 20, max = 65, -- approximate target extremes of -89.2 to 56.7
+    octaves = 2, lacunarity = 2, gain = 0.5,
   }
   map.rainfall = simplex_map.generate{   -- in millimeters of rainfall
     size = map.size, scale = 0.005, -- min = 18, max = 3240,
@@ -103,8 +117,8 @@ local generate = function()
           temperature = temperature + altitude / 1000 -- -1 C / km (deep water adjustment)
         end
         -- modify temperature by latitude
-        local polar_distance = math.abs(y - (map.size / 2))^1.1 -- experimenting with slight non-linearity
-        local max_temperature_delta = 40
+        local polar_distance = math.abs(y - (map.size / 2))^1.3 -- experimenting with slight non-linearity
+        local max_temperature_delta = 10
         temperature = temperature - (polar_distance / map.size * 2 * max_temperature_delta)
         -- 'save' temperature changes
         map.temperature[x][y] = temperature