diff --git a/mibpov.js b/mibpov.js
index 2f3810d..3161d93 100644
--- a/mibpov.js
+++ b/mibpov.js
@@ -646,19 +646,35 @@ let cachedVoronoiDiagram = null;
 function getVoronoiDiagram(points, recalculate) {
 	// Calculate bounding box, defaults to heat/humidity limits ...
 	let vbbox = {xl: limit_heat_min, xr: limit_heat_max, yb: limit_humidity_max, yt: limit_humidity_min};
-	const BUFFER_ZONE = 1;
+
 	// ... unless a point is out of bounds,
 	// then we increase the bounding box size
+
+	// Calculate by how much to extend the
+	// bounding box for the given value.
+	let getBufferZone = function(value) {
+		// This essentially calculates the "order of magnitude"
+		// in base-2.
+		return 2**Math.floor(Math.log2(Math.abs(value)));
+
+		// The reason why we do this is due to floating-point arithmetic.
+		// If we’d add/subtract a constant offset (like 1) from the value,
+		// the offset might disappear if the value is very large,
+		// due to floating point rounding, thus effectively adding/subtracting 0.
+		// This scaling makes sure we'll apply an offset that is
+		// "in the ballpark" of the origin value
+	}
+
 	for (let p of points) {
 		if (p.heat < vbbox.xl) {
-			vbbox.xl = p.heat - BUFFER_ZONE;
+			vbbox.xl = p.heat - getBufferZone(p.heat);
 		} else if (p.heat > vbbox.xr) {
-			vbbox.xr = p.heat + BUFFER_ZONE;
+			vbbox.xr = p.heat + getBufferZone(p.heat);
 		}
 		if (p.humidity < vbbox.yt) {
-			vbbox.yt = p.humidity - BUFFER_ZONE;
+			vbbox.yt = p.humidity - getBufferZone(p.humidity);
 		} else if (p.humidity > vbbox.yb) {
-			vbbox.yb = p.humidity + BUFFER_ZONE;
+			vbbox.yb = p.humidity + getBufferZone(p.humidity);
 		}
 	}
 	if ((cachedVoronoiDiagram === null) || recalculate) {