diff --git a/init.lua b/init.lua
index 03f3ab8..8583395 100644
--- a/init.lua
+++ b/init.lua
@@ -40,7 +40,8 @@ climate_mod.settings = {
 	time_spread			= get_setting_number("time_spread", 1),
 	particle_count	= get_setting_number("particle_count", 1),
 	tick_speed			= get_setting_number("tick_speed", 1),
-	volume					= get_setting_number("volume", 1)
+	volume					= get_setting_number("volume", 1),
+	ceiling_checks	= get_setting_number("ceiling_checks", 10),
 }
 
 climate_mod.i18n = minetest.get_translator("climate_api")
diff --git a/lib/influences.lua b/lib/influences.lua
index 7082f49..e5d9463 100644
--- a/lib/influences.lua
+++ b/lib/influences.lua
@@ -58,6 +58,21 @@ climate_api.register_influence("daylight", function(pos)
 	return minetest.get_node_light(pos, 0.5) or 0
 end)
 
+climate_api.register_influence("indoors", function(pos)
+	pos = vector.add(pos, {x = 0, y = 1, z = 0})
+	local daylight = minetest.get_node_light(pos, 0.5) or 0
+	if daylight < 15 then return true end
+
+	for i = 1, climate_mod.settings.ceiling_checks do
+		local lpos = vector.add(pos, {x = 0, y = i, z = 0})
+		local node = minetest.get_node_or_nil(lpos)
+		if node ~= nil and node.name ~= "air" and node.name ~= "ignore" then
+			return true
+		end
+	end
+	return false
+end)
+
 climate_api.register_global_influence("time",
 	minetest.get_timeofday
 )
\ No newline at end of file
diff --git a/mod.conf b/mod.conf
index 3b016bd..4e69155 100644
--- a/mod.conf
+++ b/mod.conf
@@ -1,7 +1,7 @@
 name = climate_api
 title = Climate API
 author = TestificateMods
-release = 10000
+release = 10001
 optional_depends = player_monoids, playerphysics, pova
 description = """
 A powerful engine for weather presets and visual effects.
diff --git a/settingtypes.txt b/settingtypes.txt
index d5a6d09..275659e 100644
--- a/settingtypes.txt
+++ b/settingtypes.txt
@@ -19,6 +19,10 @@ climate_api_block_updates (Dynamically modify nodes) bool true
 # Only applied if climate_api_damage is also set to true.
 climate_api_raycast (Include wind speed in damage checks) bool true
 
+# Increase this number if you notice snow or rain inside large glass domes.
+# Decrease this number if you notice lag spikes or overall reduced game performance.
+ceiling_checks (Check x nodes on outdoor test) int 10 0 50
+
 
 [Weather Effects]