UTC bugfix again

internal/config/config.go

@@ -107,6 +107,9 @@ func Load(path string) (*Config, error) {
 	if c.Site.Name == "" {
 		c.Site.Name = "default"
 	}
+	if c.Wunderground.Enabled && c.Site.Timezone == "" {
+		return nil, errors.New("site timezone is required when wunderground is enabled (used for daily rain boundary)")
+	}
 	if c.Site.Timezone != "" {
 		if _, err := time.LoadLocation(c.Site.Timezone); err != nil {
 			return nil, fmt.Errorf("invalid site timezone %q: %w", c.Site.Timezone, err)