diff --git a/sim/components/ble/SimpleWeatherService.h b/sim/components/ble/SimpleWeatherService.h
index be0d141..1c1be02 100644
--- a/sim/components/ble/SimpleWeatherService.h
+++ b/sim/components/ble/SimpleWeatherService.h
@@ -88,6 +88,10 @@ public:
   std::optional<CurrentWeather> Current() const;
   std::optional<Forecast> GetForecast() const;
 
+  static int16_t CelsiusToFahrenheit(int16_t celsius) {
+    return celsius * 9 / 5 + 3200;
+  }
+
 private:
   // 00050000-78fc-48fe-8e23-433b3a1942d0
   //static constexpr ble_uuid128_t BaseUuid() {