# NightFrost — Night frost and dew point calc

> Precise local frost and dew point calculator for agriculture and gardening. (iPhone/iPad app by Heiko Matthias Maetsch.)

- Source: https://appshunter.io/ios/app/nightfrost/id6751511779 (this page in markdown: same URL + `.md`)
- Developer: [Heiko Matthias Maetsch](https://appshunter.io/developer/1835493279)
- Category: Weather, Utilities
- Price: $2.99
- Rating: 1.00/5 from 1 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 6 MB
- Languages: American English, Arabic, French (France), German (Germany), Italian, Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish
- Released: 2025-08-26
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/nightfrost/id6751511779/reviews.md

## What is NightFrost?

*** One-time purchase – no ads, no subscriptions, no in-app purchases forever ***

Protect your fields, fruit trees, and gardens with precise frost forecasts – tailored exactly to your location. The Night Frost App calculates the probability of night and ground frost and shows you the dew point, the minimum temperature at 2 m height, and at ground level.

Whether ground frost will form at night can be determined for your location using the proven Magnus formula already in the late afternoon (70–80% accuracy) and 30 minutes after sunset (90% accuracy).

Physical background:
After sunset, the earth loses heat toward the sky – especially strongly when there are no clouds. As a result, the near-ground air also cools. The cooling stops as soon as the air becomes cold enough for the contained water vapor to condense into dew or fog. This releases heat, which slows down the cooling and can prevent ground frost.

How much the temperature drops at night therefore depends on the so-called dew point. If the dew point is at 0 °C or below in the evening, ground frost is to be expected during the night. The lower the dew point, the higher the risk. The more parameters are taken into account, the more accurate the forecast.

This app extends the proven, scientifically based Magnus dew point formula, which only considers temperature and humidity, with additional parameters and thus achieves a particularly high accuracy of well over 90%.

Additional parameters are:
• Wind speed
• Cloud cover
• Topography (e.g., depressions, hills)
• Soil moisture
• Location (city, settlement, countryside)
• Unobstructed view of the sky
• Snow cover

Why this app is more accurate than a standard weather forecast:
Standard weather forecasts are regional and cannot capture every cold air accumulation, valley basin, or other local condition. They therefore only provide regional probabilities, which often do not apply locally. The Night Frost App, however, uses your own on-site measurements (temperature and humidity) in combination with the decisive local conditions and thus delivers a highly precise frost warning exactly for your field or garden.

Your benefits:
• Reliably plan frost protection measures
• Protect sensitive plants and crops
• Minimize yield and quality losses

With Night Frost, farmers, winegrowers, gardeners, and beekeepers are always one step ahead of the cold.
Night Frost – your personal early warning system against night and ground frost.

## Key features

- Local frost probability calculation
- Dew point and minimum temperature display
- Ground and 2m height temperature
- High accuracy (>90%) frost prediction
- Considers wind speed, cloud cover, topography
- Protects sensitive plants and crops

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/nightfrost/id6751511779/reviews.md

### 1/5 — Rückmeldung

*2026-05-17*

Da ist nur ein Bildschirm der immer das gleiche zeigt. Stimmt auch nicht mit den außen Temperaturen. Bezahle gerne für werbefreie Apps, aber hier…… Fehlgriff

**Developer response:** Offenbar suchen Sie eine Wetter-App und haben sich die Beschreibung meiner App nicht durchgelesen. Diese App errechnet das Nachtfrost-Risiko anhand von IHNEN lokal gemessener Temperatur und Luftfeuchtigkeit. Das ist KEINE Wetter-App! Wenn Sie nichts einstellen und offenbar auch nichts gemessen haben, ändert die App natürlich auch nichts. 

Bitte lesen Sie künftig die App-Beschreibungen, bevor Sie Apps kaufen und dann unfair schlecht bewerten.

### 1/5 — So eine blöde App!

*2025-10-12*

Ich kann nichts einstellen. Nicht den Ort, wo ich bin. Auch nicht, dass die App mich benachrichtigt. Was soll das? Ich brauche eine App, die mich warnt, wenn an meinem Wohnort Nachtfrost droht. Damit ich die Pflanzen reinholen kann. Wozu sonst sollte mich Nachtfrost interessieren?

**Developer response:** Sie suchen offensichtlich ein völlig anderes Produkt. Diese App ist keine Wetter-App mit Push-Warnungen für beliebige Orte – eine solche Funktion wird auch nirgends beworben. Stattdessen arbeitet die App ausschließlich mit eigenen Messungen von Temperatur und Luftfeuchtigkeit vor Ort und berechnet daraus die Gefahr von Nachtfrost anhand der Magnus-Formel. Genau das ist in der App-Beschreibung erläutert. Wer allgemeine Wetterwarnungen wünscht, findet dafür zahlreiche andere Apps. Diese App erfüllt den beschriebenen Zweck zuverlässig.

### 5/5 — Simple, accurate and very useful!

*2025-08-28*

This app does exactly what i need: it calculates the dew point and warns me about possible night frost. Much clearer then regular weather apps. A must-have for gardeners and anyone who wants to protect plants.

**Developer response:** Vielen Dank für Ihr positives Feedback! Es freut mich sehr, dass die App Ihnen beim Schutz Ihrer Pflanzen hilft und Sie den klaren Ansatz schätzen. Genau dafür wurde sie entwickelt. Viel Erfolg weiterhin beim Gärtnern!

Thank you very much for your positive feedback! I’m glad to hear the app helps you protect your plants and that you appreciate its clear approach. That’s exactly what it was designed for. Happy gardening!

## Frequently asked questions about NightFrost

### What is the accuracy of NightFrost's frost forecasts?

NightFrost achieves a particularly high accuracy of well over 90% by extending the Magnus dew point formula with additional parameters. The accuracy is estimated at 70-80% in the late afternoon and 90% 30 minutes after sunset.

### Does NightFrost have ads or subscriptions?

No, NightFrost is a one-time purchase with no ads, no subscriptions, and no in-app purchases forever. You pay once and have full access.

### What devices does NightFrost support?

NightFrost is supported on iPhone and iPad devices. It is designed to provide precise forecasts on Apple mobile platforms.

### How does NightFrost differ from standard weather forecasts?

Standard weather forecasts are regional and may not account for local conditions like cold air accumulation or valley basins. NightFrost uses your on-site measurements and decisive local conditions for highly precise, location-specific frost warnings.

### What factors does NightFrost consider for its forecasts?

In addition to temperature and humidity, NightFrost considers wind speed, cloud cover, topography, soil moisture, location type (city, countryside), unobstructed view of the sky, and snow cover for its forecasts.

### What is the price of NightFrost?

NightFrost is available for a one-time purchase price of $2.99. This purchase includes all features and future updates without additional costs.

### How often is NightFrost updated?

The latest version of NightFrost is 1.5, and it was last updated on September 2, 2025. Updates typically address performance improvements and feature enhancements.

### What is the age rating for NightFrost?

NightFrost has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.

## Version history (last 2 releases)

### 1.5 — 2025-09-02

- Temperature display according to system settings Temperature (C/F), °F is now displayed correctly
- Uniform format with spaces: 20 °C, 35 °F, 12 km/h, 7 mph, 80 %
- Toggles ‘Snow cover’ / ‘Manual sky view’ no longer cut off
- Calculation logic (tdPull) corrected
- Last settings are saved via @AppStorage and reloaded at start-up
- New language versions: Italian, Japanese, Korean

### 1.0 — 2025-08-27

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*