Temperature Block
by MisterCosmos
Temperature Block is a NeoForge decoration block whose color shifts from blue for cold to red for hot, based on its own thermal value.
What it does
A Temperature Block starts from the base temperature of its biome and then adjusts it for nearby heat sources. Lava adds 50 to the value, fire adds 30 and water subtracts 20. The result is kept between 0 and 400, so the reading stays predictable across the whole range.
Colors run from deep blue for cool readings below 200, through green near the midpoint, to bright red above 200, which makes cooler and hotter zones stand out. The color is calculated per block from its own state rather than from an external overlay. Color handling runs on the client, so the server carries little extra load. The mod is available for 1.21.1 and 1.21.4, targets NeoForge, and is released under the MIT License without being open source. Both the server and every player need it.
Key features
Color gradient readout
The block color moves smoothly from blue through green to red, so the thermal state can be read at a glance.
Biome and nearby heat
The reading starts from the biome's base temperature and changes with lava, fire and water placed around the block.
Capped temperature range
Values are limited to a range of 0 to 400, so the displayed state stays consistent between readings.
Client-side color rendering
Color handling happens on the client through the color handler event, keeping the server side light for large builds.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Redstone thermal monitors
Blocks can be placed in redstone circuits and monitoring setups, where the color shift shows temperature spikes and drops without extra tools.
Large-scale thermal displays
Builders can lay out many blocks to track heat distribution across a base or region at a glance.
Who it’s for: Players who build redstone monitoring setups and builders who want a visual map of heat across an area. The mod suits decorative displays as well as functional sensors.
How it compares
Metrica is also a NeoForge mod for 1.21.1, released under the MIT License and open source, and it runs on client and server. Palettable is a NeoForge mod for 1.21.1 that is client-side only, so servers do not need it, and it is not open source. Icewind targets 1.21.4 and is server required with optional client support, under the MIT License, and it is open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Temperature Block | NeoForge | 1.21.1 – 1.21.4 | Client and server | 2026-09-30 |
| Metrica | NeoForge | 1.21.1 | Client and server | 2026-01-28 |
| Palettable | NeoForge | 1.21.1 | Client-side only | 2026-07-09 |
| Icewind | Fabric, Forge, NeoForge and Quilt | 1.21.4 | Server required, client optional | 2026-04-20 |
Questions
Does Temperature Block need to be installed on the server?
Which game versions have files?
Does the block color depend on other overlays?
In the catalog
Temperature Block is one of 12,078 Decoration mods on ModsFinder, and one of 5,201 Decoration mods for NeoForge. 17,979 mods support Minecraft 1.21.4.
More from MisterCosmos
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What the author says
We’ve turned a simple thermal block into a responsive environmental sensor — now it doesn’t just show temperature, it reacts to the world around it. The mod brings dynamic thermal logic and vivid visual feedback to your builds, letting you track heat distribution at a glance. 💡 Tip: Use Temperature Blocks in…
Official listing
- Modrinth page
- modrinth.com/mod/temperature-block
- Owner
- MisterCosmos
- Published
- 2026-09-11
- Updated on Modrinth
- 2026-09-30
- Facts verified
- 2026-10-15