WeatherPro for iPhone and WeatherPro for iPad are not identical apps. Currently the forecast summaries on WeatherPro for iPhone are split into 12 hour periods (day: 6-18 and night: 18-6 UTC) whereas the summaries on iPad are for 24 hours (18-18 UTC). Total rainfall during a full day will be higher than the rainfall during the morning or the night hence the discrepancy between the iPhone and iPad summaries.
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