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What are the sources for WeatherOnline forecasts?


The WeatherOnline forecasts are created by using a MOS system developed in-house with the most current US weather services model data (GFS). The statistical methods of the Model-Output-Statistic (MOS)-System were developed in cooperation with the Meteorological Department of the University of Bonn.

What is a MOS-System?


A Model-Output-Statistic (MOS)-System combines the data of the weather forecast model and the locally recorded data for any given point by transforming the model data from a coarse grid to detailed small scale areas.
In order to do so, one needs a large volume of past model forecast data as well as the corresponding recorded data for any given location. The MOS-System relates these two sets of data in an optimized fashion allowing development of the local weather forecast by using the most current model forecast.

What are the time intervals used in the temperature and icons of the local forecasts?


The forecasted maximum temperature always refers to a 12hour window from 6am to 6om local time.
The forecasted minimum temperature always refers to the 12hour window from 6pm of the day before the forecast day to 6 am of the forecast day.
The weather icon for the morning refers to the time between 6am and 12pm local time, the icon for the afternoon is valid from 12am to 6pm local time and the evening icon refers to the time from 6pm to 12am local time.

How often are the current weather conditions and forecasts updated?


The current weather information as well as the satellite images are updated every 30 minutes whereas the radar images are being updated every 15 minutes.
The local weather forecasts as well as the weather charts are updated 8 times a day. The updates start at 2 am CEST or 3 am CEST depending on daylight saving time and continue on a three hourly bases.


Estaciones meteorológicas cercanas - Guidonia Montecelio Distancia
Guidonia Montecelio 0.0 km
Rome/Urbe 26.5 km
Ciampino 28.9 km
Rieti 48.1 km
Pratica di Mare 50.6 km
Latina 52.3 km
Terminillo 57.8 km
Vigna Di Valle 58.8 km
Roma-Fiumicino aeropuerto 59.2 km
Frosinone 74.6 km
Viterbo 89.5 km
Civitavecchia 100.3 km
Isla de Ponza 120.0 km
Perugia 120.5 km
Radicofani 145.5 km
Frontone 164.7 km
Pescara 169.9 km
San Giovanni Teatino 170.7 km
Monte Argentario 179.1 km
Grazzanise 180.6 km
Arezzo 187.4 km
Ancona/Falconara 189.0 km
Grosseto 202.7 km
Naples/Capodichino 211.3 km
Campobasso 218.4 km
Rímini 219.8 km
Isla de Capri 226.5 km
Cervia 246.3 km
Forlì 250.4 km
Térmoli 252.3 km
Florencia/Peretola 259.9 km
Point Marina/Ravenna 270.6 km
Monte Calamita 271.8 km
Calamita 273.8 km
Salerno Costa d'Amalfi aeropuerto 284.7 km
Trevico 296.6 km
Foggia "Gino Lisa" aeropuerto 317.8 km
Bologna/Borgo 318.6 km
Pisa 319.6 km
Monte Cimone 329.2 km
Ferrara 332.4 km
Mali Lošinj 335.2 km
Amendola 335.9 km
Pula aeropuerto 340.9 km
Alistro 357.4 km
Zadar 358.7 km
Monte Sant'Angelo 359.2 km
Ustica 360.6 km
Bastia-Poretta aeropuerto 366.8 km
Zara aeropuerto 369.4 km
Solenzara 371.2 km
Rab 374.8 km
Pazin 376.1 km
Olbia 377.7 km
Sarzana/Luni 381.3 km
Vieste 382.2 km
Padua aeropuerto 382.3 km
Marco Polo aeropuerto 382.9 km
Portorož aeropuerto 389.3 km
Cap Corse 389.6 km
Komiža 390.1 km
Portorož 392.3 km
Palagruža 393.0 km
Zavizan 394.2 km
Šibenik 400.6 km
Capo Pertusato 401.2 km
Treviso 401.4 km
Gospić 402.2 km
Senj 402.7 km
Rijeka aeropuerto 403.6 km
Capo Bellavista 405.1 km
Istrana 406.6 km
Rijeka 408.1 km
Figari 408.4 km
Parma 410.8 km
Trieste 411.4 km
Palermo-Punta Raisi aeropuerto 416.8 km
Latronico 419.9 km
Ronchi Legionari 422.1 km
Villafranca 423.3 km
Split aeropuerto 430.4 km
L'Île-Rousse 430.5 km
Hvar 432.4 km
Codroipo 432.8 km
City 434.4 km
Bonifati 437.5 km
Ajaccio-Napoleón Bonaparte aeropuerto 437.6 km
Aviano Aeropuerto 437.8 km
Postojna 438.9 km
Capo S. Lorenzo 440.5 km
Marjan 442.0 km
Parg 442.3 km
Calvi/St Catherine 442.7 km
Ogulin 449.4 km
Vojsko 455.0 km
Kočevje 459.6 km
Brescia aeropuerto 459.8 km
Bari/Palese Macchie 460.4 km
Plasencia 461.4 km
Bihać 463.9 km