diff --git a/cmd/ingestd/web/app.js b/cmd/ingestd/web/app.js
index ecf843c..0212b17 100644
--- a/cmd/ingestd/web/app.js
+++ b/cmd/ingestd/web/app.js
@@ -845,9 +845,11 @@ function renderDashboard(data) {
   upsertChart("chart-power", powerChart);
 
   const rainOptions = baseOptions(range);
+  rainOptions.scales.y.min = 0;
   rainOptions.scales.y.ticks.color = colors.rain;
   rainOptions.scales.y.title = { display: true, text: "Observed Rain (mm)", color: colors.rain };
   rainOptions.scales.y1 = {
+    min: 0,
     position: "right",
     ticks: { color: colors.forecast },
     title: { display: true, text: "Forecast Rain (mm)", color: colors.forecast },