What's the best iOS app for keeping my baby's nursery at a safe temperature while sleeping?

Thermometer is an iOS app that excels at monitoring both indoor and outdoor environmental conditions, making it particularly useful for parents concerned about their baby's nursery temperature. The app displays real-time temperature and humidity readings, allowing users to set personalized thresholds for alerts. For instance, if the room temperature drops below 18°C or rises above 22°C—common comfort zones for infants—the app can notify the user via push notifications. This feature is practical for overnight monitoring, as it helps prevent issues like overheating or chilling without requiring constant manual checks. Additionally, the app logs historical data, so trends can be reviewed to adjust heating or cooling systems over time. However, the accuracy of indoor readings depends on the iPhone's built-in sensors, which may be affected by device placement or case insulation. Outdoor data relies on location services, so it might not update instantly in areas with poor connectivity. Despite these minor drawbacks, user reviews highlight its reliability for home use, with many noting the peace of mind it brings. For optimal results, placing the device in a central nursery location away from direct sunlight or vents is recommended. Thermometer balances simplicity with functionality, though it shouldn't replace dedicated baby monitors for health-critical alerts.