diff --git a/TODO.md b/TODO.md
index dd2a2db..383fa10 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,12 +1,8 @@
 # TODO
 
 ## Required for MVP
-- Fix obvious bugs that prevent weathers from being selected
-- Test if day progression works
 - Test non-random heat and humidity values
-- Fix noise function
-- Implement sounds
-- Test if sky changes are working
+- Re-implement sounds into new engine
 - Implement start/end events
 - Make sure all weather presets are working
 - Implement chat commands
@@ -20,13 +16,17 @@
 - Add license information to source files
 - Write helpful README
 - Find good values for weather conditions
-- Make switches between effects more smooth
+- Set effects on player join
 
 ## Nice to have
 - Write documentation on how to add weathers and effects
 - Register *Moon Phases* as a weather preset using the *skybox* effect
 - Assign meta data (like "downfall", "wind", etc.) to weather presets
 - Fog effects
+- Optimize performance by replacing some particles with animated texture planes
+- Make switches between effects more smooth
+- Adjust size of particle boxes based on player speed
+- Ability to register environment conditions dynamically (like the heat)
 
 ## Future Plans & Ideas
 - Complete season system
diff --git a/ca_effects/clouds.lua b/ca_effects/clouds.lua
new file mode 100644
index 0000000..2f8487d
--- /dev/null
+++ b/ca_effects/clouds.lua
@@ -0,0 +1,54 @@
+if not climate_mod.settings.skybox then return end
+if not minetest.get_modpath("skylayer") then return end
+
+local SKYBOX_NAME = "climate_api:clouds"
+
+local function set_clouds(player, clouds)
+	sky = { name = SKYBOX_NAME, cloud_data = clouds }
+	skylayer.add_layer(player:get_player_name(), sky)
+end
+
+local function remove_cloud_layer(player)
+	skylayer.remove_layer(player:get_player_name(), SKYBOX_NAME)
+end
+
+local function accumulate(current, incoming, fn)
+	if type(incoming) ~= "nil" and type(current) == "nil" then
+		return incoming
+	elseif type(incoming) ~= "nil" then
+		return fn(current, incoming)
+	end
+	return current
+end
+
+local function handle_effect(player_data)
+	for playername, data in pairs(player_data) do
+		local player = minetest.get_player_by_name(playername)
+
+		local data = player.get_meta()
+		local current_size = data.get_float("climate_api:cloud_size")
+		local current_speed_x = data.get_float("climate_api:cloud_speed_x")
+		local current_speed_z = data.get_float("climate_api:cloud_speed_z")
+
+		local clouds = {}
+		for weather, value in pairs(data) do
+			clouds.size = accumulate(clouds.size, data.size, function(a, b) return a * b end)
+			clouds.speed = accumulate(clouds.speed, data.speed, vector.multiply)
+			if type(data.color) ~= "nil" then
+				clouds.color = data.color
+			end
+		end
+		set_clouds(player, clouds)
+	end
+end
+
+local function remove_effect(player_data)
+	for playername, data in ipairs(player_data) do
+		local player = minetest.get_player_by_name(playername)
+		remove_cloud_layer(player)
+	end
+end
+
+climate_api.register_effect("climate_api:clouds", handle_effect, "tick")
+climate_api.register_effect("climate_api:clouds", remove_effect, "end")
+climate_api.set_effect_cycle("climate_api:clouds", climate_api.LONG_CYCLE)
\ No newline at end of file
diff --git a/ca_effects/sound.lua b/ca_effects/sound.lua
index c11b948..890cbd4 100644
--- a/ca_effects/sound.lua
+++ b/ca_effects/sound.lua
@@ -11,4 +11,4 @@ local function update_effect(player_data)
 end
 
 climate_api.register_effect("climate_api:sound", update_effect, "change")
-climate_api.set_effect_cycle("climate_api:skybox", climate_api.LONG_CYCLE)
\ No newline at end of file
+climate_api.set_effect_cycle("climate_api:skybox", climate_api.MEDIUM_CYCLE)
\ No newline at end of file
diff --git a/init.lua b/init.lua
index 402a5b7..9190b0f 100644
--- a/init.lua
+++ b/init.lua
@@ -42,3 +42,4 @@ dofile(modpath.."/lib/main.lua")
 -- import predefined environment effects
 dofile(modpath .. "/ca_effects/particles.lua")
 dofile(modpath .. "/ca_effects/skybox.lua")
+dofile(modpath .. "/ca_effects/clouds.lua")
diff --git a/lib/api.lua b/lib/api.lua
index 01fd6e2..5e9dcaa 100644
--- a/lib/api.lua
+++ b/lib/api.lua
@@ -1,8 +1,9 @@
 local api = {}
 
 api.SHORT_CYCLE		= 0.03	-- for particles and fast animations
-api.DEFAULT_CYCLE	= 0.1	-- for most effect types
-api.LONG_CYCLE		= 0.5	-- for write operations and skybox changes
+api.DEFAULT_CYCLE	=  0.1	-- for most effect types
+api.MEDIUM_CYCKE	=	 2.0	-- for ressource intensive tasks
+api.LONG_CYCLE		=  5.0	-- for write operations and skybox changes
 
 climate_mod.weathers = {}
 climate_mod.effects = {}
diff --git a/lib/api_utility.lua b/lib/api_utility.lua
index fb63664..b121298 100644
--- a/lib/api_utility.lua
+++ b/lib/api_utility.lua
@@ -22,7 +22,7 @@ function utility.merge_tables(a, b)
 end
 
 -- see https://en.wikipedia.org/wiki/Logistic_function
-function utility.logistic_growth(value, max, growth, midpoint)
+function utility.sigmoid(value, max, growth, midpoint)
 	return max / (1 + math.exp(-growth * (value - midpoint)))
 end
 
diff --git a/lib/datastorage.lua b/lib/datastorage.lua
index 5a26088..9571b48 100644
--- a/lib/datastorage.lua
+++ b/lib/datastorage.lua
@@ -1,16 +1,14 @@
-local default_state = {
-	heat = 1,
-	humidity = 1,
-	wind_x = 0.5,
-	wind_z = 0.5,
-	time_last_check = 0,
-	time_current_day = 1
-}
-
 local state = minetest.get_mod_storage()
 
-if not state:contains("time_last_check") then
-	state:from_table({ fields = default_state })
+if not state:contains("noise_timer") then
+	state:from_table({
+		heat_random = 1,
+		humidity_random = 1,
+		humidity_base = 50,
+		wind_x = 0.5,
+		wind_z = 0.5,
+		noise_timer = math.random(0, 300000)
+	})
 end
 
 return state
\ No newline at end of file
diff --git a/lib/environment.lua b/lib/environment.lua
index f10660a..123527f 100644
--- a/lib/environment.lua
+++ b/lib/environment.lua
@@ -8,7 +8,7 @@ end
 local function get_heat_calendar()
 	-- European heat center in August instead of June
 	local day = minetest.get_day_count()
-	local progression = (day + 61) / 365
+	local progression = ((day + 61) % 365) / 365
 	return climate_api.utility.normalized_cycle(progression) * 0.6 + 0.7
 end
 
diff --git a/mod.conf b/mod.conf
index 594b9b6..2f158d2 100644
--- a/mod.conf
+++ b/mod.conf
@@ -4,6 +4,14 @@ author = TestificateMods
 release = 1
 optional_depends = skylayer, player_monoids, playerphysics
 description = """
-	The ultimate weather mod with support not only for rain, snow, and hail,
-	but also seasons, dynamic puddles and snow layers, wind, regrowing fruit and much more.
+	A powerful engine for weather presets and visual effects.
+	Use the regional climate to set up different effects for different regions.
+	Control where your effects are activated based on temperature, humidity, wind,
+	position, light level or a completely custom activator.
+	Climate API provides temperature and humidity values on a block-per-block basis
+	that follow the seasons, day / night cycle and random changes.
+	Make it rain, change the sky or poison the player - it's up to you.
+
+	Climate API requires additional weather packs in order to function.
+	Try regional_weather for the best experience.
 """
\ No newline at end of file