diff --git a/internal/collector/collector.go b/internal/collector/collector.go
index e1c2a9a..efa8574 100644
--- a/internal/collector/collector.go
+++ b/internal/collector/collector.go
@@ -112,6 +112,7 @@ var (
 		nil)
 )
 
+// NetatmoCollector is a Prometheus collector for Netatmo sensor values.
 type NetatmoCollector struct {
 	Log                 logrus.FieldLogger
 	RefreshInterval     time.Duration
@@ -135,7 +136,7 @@ func (c *NetatmoCollector) Describe(dChan chan<- *prometheus.Desc) {
 func (c *NetatmoCollector) Collect(mChan chan<- prometheus.Metric) {
 	now := time.Now()
 	if now.Sub(c.lastRefresh) >= c.RefreshInterval {
-		go c.refreshData(now)
+		go c.RefreshData(now)
 	}
 
 	upValue := 1.0
@@ -163,8 +164,9 @@ func (c *NetatmoCollector) Collect(mChan chan<- prometheus.Metric) {
 	}
 }
 
-func (c *NetatmoCollector) refreshData(now time.Time) {
-	c.Log.Debugf("Refresh interval elapsed: %s > %s", now.Sub(c.lastRefresh), c.RefreshInterval)
+// RefreshData causes the collector to try to refresh the cached data.
+func (c *NetatmoCollector) RefreshData(now time.Time) {
+	c.Log.Debugf("Refreshing data. Time since last refresh: %s", now.Sub(c.lastRefresh))
 	c.lastRefresh = now
 
 	defer func(start time.Time) {
diff --git a/main.go b/main.go
index 1e66ec9..7eccef0 100644
--- a/main.go
+++ b/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"net/http"
 	"os"
+	"time"
 
 	netatmo "github.com/exzz/netatmo-api-go"
 	"github.com/prometheus/client_golang/prometheus"
@@ -45,6 +46,9 @@ func main() {
 	}
 	prometheus.MustRegister(metrics)
 
+	// Trigger first refresh
+	metrics.RefreshData(time.Now())
+
 	http.Handle("/metrics", promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{}))
 	http.Handle("/version", versionHandler(log))
 	http.Handle("/", http.RedirectHandler("/metrics", http.StatusFound))