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Average Weather in Rome Italy

In Rome, the temperature typically varies from 37°F to 89°F over the course of the year, and is rarely below 28°F or above 95°F.

The hot season lasts for 87 days, from June 16 to September 11, with an average daily high temperature above 81°F. The hottest day of the year is August 5, with an average high of 89°F and low of 66°F.

The cool season lasts for 119 days, from November 19 to March 18, with an average daily high temperature below 61°F. The coldest day of the year is January 13, with an average low of 37°F and high of 53°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillychillycoldcoldcoolcoolcomfortablecomfortablewarmwarmhothot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day in Rome varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 8 minutes of daylight; the longest day is June 21, with 15 hours, 14 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:34 AM on June 15, and the latest sunrise is 2 hours, 4 minutes later at 7:37 AM on January 3. The earliest sunset is at 4:38 PM on December 8, and the latest sunset is 4 hours, 11 minutes later at 8:49 PM on June 27.

Daylight saving time (DST) is observed in Rome during 2017, starting in the spring on March 26, lasting 216 days, and ending in the fall on October 29.

Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Clouds

In Rome, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Rome begins around June 9 and lasts for 95 days, ending around September 12. On July 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 88% of the time, and overcast or mostly cloudy 12% of the time.

The cloudier part of the year begins around September 12 and lasts for 270 days, ending around June 9. On November 29, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecNov 2948%Nov 2948%Jul 2112%Jul 2112%Jun 930%Jun 930%Sep 1230%Sep 1230%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Rome varies throughout the year.

The wetter season lasts 245 days, from September 8 to May 11, with a greater than 20% chance of a given day being a wet day. The chance of a wet day peaks at 34% on November 19.

The drier season lasts 120 days, from May 11 to September 8. The smallest chance of a wet day is 7% on August 2.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 34% on November 19.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Rome experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Rome. The most rain falls during the 31 days centered around November 18, with an average total accumulation of 3.7 inches.

The least rain falls around July 25, with and average total accumulation of 0.6 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Rome experiences very significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 109 days, from June 15 to October 2, during which time the comfort level is muggy, oppressive, or miserable at least 13% of the time. The muggiest day of the year is August 12, with muggy conditions 51% of the time.

The least muggy day of the year is December 17, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

muggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecDec 170%Dec 170%Aug 1251%Aug 1251%Jun 1514%Jun 1514%Oct 213%Oct 213%oppressiveoppressivemuggymuggycomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Rome does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 4.1 miles per hour throughout.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Rome varies throughout the year.

The wind is most often from the south for 70 days, from March 4 to May 13 and for 52 days, from September 20 to November 11, with a peak percentage of 34% on October 18. The wind is most often from the west for 130 days, from May 13 to September 20, with a peak percentage of 46% on July 24. The wind is most often from the east for 113 days, from November 11 to March 4, with a peak percentage of 33% on December 9.

Wind Direction

EESSWWSSEE0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Rome is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 86 days, from June 29 to September 23, with an average temperature above 73°F. The day of the year with the warmest water is August 12, with an average temperature of 78°F.

The time of year with cooler water lasts for 136 days, from December 15 to April 30, with an average temperature below 61°F. The day of the year with the coolest water is February 26, with an average temperature of 57°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences very significant seasonal variation over the course of the year.

The brighter period of the year lasts for 100 days, from May 10 to August 18, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest day of the year is July 6, with an average of 7.7 kWh.

The darker period of the year lasts for 111 days, from October 27 to February 15, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest day of the year is December 16, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Rome are 41.892 deg latitude, 12.511 deg longitude, and 141 ft elevation (map ).

The topography within 2 miles of Rome contains only modest variations in elevation, with a maximum elevation change of 249 feet, and an average elevation above sea level of 152 feet. Within 10 miles contains very significant variations in elevation (938 feet). Within 50 miles contains extreme variations in elevation (8,110 feet).

The area within 2 miles of Rome is covered by artificial surfaces (97%), within 10 miles by cropland (54%) and artificial surfaces (43%), and within 50 miles by cropland (36%) and water (33%).

Data Sources

This report illustrates the typical weather in Rome, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Rome.

For each station, the records are corrected for the elevation difference between that station and Rome according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Rome is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rome and a given station.

The stations contributing to this reconstruction are: Rome Urbe Airport (67%, 7 kilometers, north), Roma Ciampino Airport (22%, 12 kilometers, southeast), and Leonardo da Vinci–Fiumicino Airport (11%, 24 kilometers, southwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .