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Climate and Average Weather Year Round in Civitavecchia Italy

In Civitavecchia, the summers are short, warm, muggy, dry, and mostly clear and the winters are long, cold, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 42°F to 84°F and is rarely below 34°F or above 88°F.

Based on the beach/pool score, the best time of year to visit Civitavecchia for hot-weather activities is from late June to early September.

Climate in Civitavecchia

coolcomfortablewarmcoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow88%88%53%53%clearovercastprecipitation: 3.6 inprecipitation: 3.6 in0.6 in0.6 inmuggy: 75%muggy: 75%0%0%drydrybeach/pool score: 8.5beach/pool score: 8.50.00.0
Civitavecchia weather by month. Click on each chart for more information.

The warm season lasts for 2.8 months, from June 19 to September 13, with an average daily high temperature above 78°F. The hottest month of the year in Civitavecchia is August, with an average high of 83°F and low of 69°F.

The cool season lasts for 4.1 months, from November 25 to March 27, with an average daily high temperature below 61°F. The coldest month of the year in Civitavecchia is February, with an average low of 42°F and high of 56°F.

Average High and Low Temperature in Civitavecchia

Average High and Low Temperature in CivitavecchiawarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 955°FFeb 955°FAug 584°FAug 584°F42°F42°F70°F70°FJun 1978°FJun 1978°FSep 1378°FSep 1378°FNov 2561°FNov 2561°FMar 2761°FMar 2761°F64°F64°F64°F64°F49°F49°F47°F47°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 55°F56°F59°F64°F71°F77°F83°F83°F78°F71°F63°F58°F
Temp. 49°F49°F52°F57°F64°F71°F76°F77°F71°F65°F57°F51°F
Low 43°F42°F45°F50°F57°F63°F68°F69°F64°F58°F51°F45°F

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 in Civitavecchia

Average Hourly Temperature in CivitavecchiaJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowcoldcoldcoolcoolcomfortablewarmvery coldwarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Montevideo, Uruguay (6,844 miles away) and Tateyama, Japan (6,188 miles) are the far-away foreign places with temperatures most similar to Civitavecchia (view comparison).

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Compare Civitavecchia to another city:

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In Civitavecchia, 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 Civitavecchia begins around June 11 and lasts for 3.0 months, ending around September 10.

The clearest month of the year in Civitavecchia is July, during which on average the sky is clear, mostly clear, or partly cloudy 87% of the time.

The cloudier part of the year begins around September 10 and lasts for 9.0 months, ending around June 11.

The cloudiest month of the year in Civitavecchia is January, during which on average the sky is overcast or mostly cloudy 46% of the time.

Cloud Cover Categories in Civitavecchia

Cloud Cover Categories in CivitavecchiaclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2488%Jul 2488%Jan 2153%Jan 2153%Jun 1170%Jun 1170%Sep 1070%Sep 1070%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 46%43%43%42%39%26%13%18%32%43%46%45%
Clearer 54%57%57%58%61%74%87%82%68%57%54%55%

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

The wetter season lasts 8.2 months, from September 7 to May 14, with a greater than 19% chance of a given day being a wet day. The month with the most wet days in Civitavecchia is November, with an average of 9.1 days with at least 0.04 inches of precipitation.

The drier season lasts 3.8 months, from May 14 to September 7. The month with the fewest wet days in Civitavecchia is July, with an average of 2.3 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Civitavecchia is November, with an average of 9.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 33% on November 18.

Daily Chance of Precipitation in Civitavecchia

Daily Chance of Precipitation in CivitavecchiawetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 1833%Nov 1833%Aug 46%Aug 46%Sep 719%Sep 719%May 1419%May 1419%NowNowrain
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 6.7d6.7d6.7d6.8d5.9d3.9d2.3d2.8d6.5d8.3d9.1d7.8d

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 of the year. Civitavecchia experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Civitavecchia. The month with the most rain in Civitavecchia is November, with an average rainfall of 3.6 inches.

The month with the least rain in Civitavecchia is July, with an average rainfall of 0.6 inches.

Average Monthly Rainfall in Civitavecchia

Average Monthly Rainfall in CivitavecchiaJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 inNov 153.6 inNov 153.6 inJul 210.6 inJul 210.6 inFeb 112.2 inFeb 112.2 inApr 171.9 inApr 171.9 inNowNow
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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 2.0″2.2″1.9″1.9″1.6″1.0″0.6″1.0″2.5″3.3″3.6″2.7″

The length of the day in Civitavecchia varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 6 minutes of daylight; the longest day is June 20, with 15 hours, 15 minutes of daylight.

Hours of Daylight and Twilight in Civitavecchia

Hours of Daylight and Twilight in CivitavecchiaJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 15 minJun 2015 hr, 15 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 6 minDec 219 hr, 6 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.5h10.6h12.0h13.4h14.6h15.2h14.9h13.8h12.5h11.0h9.8h9.2h

The earliest sunrise is at 5:36 AM on June 14, and the latest sunrise is 2 hours, 5 minutes later at 7:41 AM on January 4. The earliest sunset is at 4:40 PM on December 8, and the latest sunset is 4 hours, 12 minutes later at 8:52 PM on June 27.

Daylight saving time (DST) is observed in Civitavecchia during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

Sunrise & Sunset with Twilight and Daylight Saving Time in Civitavecchia

Sunrise & Sunset with Twilight and Daylight Saving Time in CivitavecchiaJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:36 AMJun 145:36 AM8:52 PMJun 278:52 PMJun 27Dec 84:40 PMDec 84:40 PM7:41 AMJan 47:41 AMJan 4Mar 31DSTMar 31DSTDSTOct 27DSTOct 27daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. 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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Civitavecchia

Solar Elevation and Azimuth in CivitavecchiaJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM000010101020202030303040405050606000010101010202020303040405050602471NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Civitavecchia

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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.

Civitavecchia experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.3 months, from May 30 to October 8, during which time the comfort level is muggy, oppressive, or miserable at least 19% of the time. The month with the most muggy days in Civitavecchia is August, with 21.6 days that are muggy or worse.

The least muggy day of the year is February 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Civitavecchia

Humidity Comfort Levels in CivitavecchiamuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 110%Feb 110%Aug 875%Aug 875%May 3019%May 3019%Oct 819%Oct 819%NowNowoppressiveoppressivemuggymuggydrydryhumidhumidmiserablemiserable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.1d2.7d11.1d20.5d21.6d12.6d4.3d0.5d0.0d

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 Civitavecchia experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from October 17 to April 23, with average wind speeds of more than 9.6 miles per hour. The windiest month of the year in Civitavecchia is December, with an average hourly wind speed of 11.1 miles per hour.

The calmer time of year lasts for 5.8 months, from April 23 to October 17. The calmest month of the year in Civitavecchia is August, with an average hourly wind speed of 8.0 miles per hour.

Average Wind Speed in Civitavecchia

Average Wind Speed in CivitavecchiawindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphDec 2011.3 mphDec 2011.3 mphAug 117.9 mphAug 117.9 mphOct 179.6 mphOct 179.6 mphApr 239.6 mphApr 239.6 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 10.610.910.59.98.68.18.08.08.79.610.811.1

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

The wind is most often from the south for 2.3 months, from March 8 to May 18 and for 2.2 months, from September 14 to November 19, with a peak percentage of 35% on October 14. The wind is most often from the west for 3.9 months, from May 18 to September 14, with a peak percentage of 41% on July 24. The wind is most often from the north for 3.6 months, from November 19 to March 8, with a peak percentage of 35% on January 1.

Wind Direction in Civitavecchia

Wind Direction in CivitavecchiaNSWSNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Civitavecchia 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 2.7 months, from June 28 to September 20, with an average temperature above 73°F. The month of the year in Civitavecchia with the warmest water is August, with an average temperature of 77°F.

The time of year with cooler water lasts for 4.5 months, from December 12 to April 28, with an average temperature below 61°F. The month of the year in Civitavecchia with the coolest water is February, with an average temperature of 57°F.

Average Water Temperature in Civitavecchia

Average Water Temperature in CivitavecchiawarmcoolJanFebMarAprMayJunJulAugSepOctNovDec55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°FAug 1077°FAug 1077°F57°FFeb 2557°FFeb 25Jun 2873°FJun 2873°FSep 2073°FSep 2073°FDec 1261°FDec 1261°FApr 2861°FApr 2861°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 58°F57°F57°F59°F64°F71°F75°F77°F74°F70°F65°F61°F

To characterize how pleasant the weather is in Civitavecchia throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Civitavecchia for general outdoor tourist activities are from mid May to mid July and from late August to early October, with a peak score in the third week of June.

Tourism Score in Civitavecchia

Tourism Score in Civitavecchiabest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.97.92.02.07.67.66.66.6NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Civitavecchia for hot-weather activities is from late June to early September, with a peak score in the third week of July.

Beach/Pool Score in Civitavecchia

Beach/Pool Score in Civitavecchiabest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.58.50.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Civitavecchia typically lasts for 11 months (337 days), from around February 8 to around January 10, rarely starting after March 10, or ending before December 18.

Time Spent in Various Temperature Bands and the Growing Season in Civitavecchia

Time Spent in Various Temperature Bands and the Growing Season in Civitavecchiagrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 850%Feb 850%Jan 1050%Jan 1090%Mar 1090%Mar 1090%Dec 1890%Dec 18Aug 11100%Aug 11100%NowNowvery coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Civitavecchia should appear around February 12, only rarely appearing before January 26 or after March 2.

Growing Degree Days in Civitavecchia

Growing Degree Days in CivitavecchiaJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°FFeb 1287°FFeb 1287°FMay 30900°FMay 30900°FJul 111,800°FJul 111,800°FDec 314,622°FDec 314,622°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from May 8 to August 16, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest month of the year in Civitavecchia is July, with an average of 7.6 kWh.

The darker period of the year lasts for 3.6 months, from October 27 to February 14, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest month of the year in Civitavecchia is December, with an average of 1.8 kWh.

Average Daily Incident Shortwave Solar Energy in Civitavecchia

Average Daily Incident Shortwave Solar Energy in CivitavecchiabrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 57.8 kWhJul 57.8 kWhDec 151.7 kWhDec 151.7 kWhMay 86.5 kWhMay 86.5 kWhAug 166.5 kWhAug 166.5 kWhOct 272.9 kWhOct 272.9 kWhFeb 142.9 kWhFeb 142.9 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 2.03.04.45.76.87.57.66.55.03.42.21.8

For the purposes of this report, the geographical coordinates of Civitavecchia are 42.093 deg latitude, 11.797 deg longitude, and 72 ft elevation.

The topography within 2 miles of Civitavecchia contains significant variations in elevation, with a maximum elevation change of 614 feet and an average elevation above sea level of 116 feet. Within 10 miles contains significant variations in elevation (2,100 feet). Within 50 miles contains large variations in elevation (3,675 feet).

The area within 2 miles of Civitavecchia is covered by water (41%), cropland (29%), and artificial surfaces (27%), within 10 miles by water (55%) and cropland (25%), and within 50 miles by water (52%) and cropland (31%).

This report illustrates the typical weather in Civitavecchia, 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 Civitavecchia.

For each station, the records are corrected for the elevation difference between that station and Civitavecchia 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 Civitavecchia is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Civitavecchia and a given station.

The stations contributing to this reconstruction are:

  • Civitavecchia (LIQJ, 91%, 5 mi, south, -59 ft elevation change)
  • Viterbo (LIRV, 6%, 27 mi, northeast, 915 ft elevation change)
  • Monte Argentario (LIQO, 2.8%, 38 mi, northwest, 2,001 ft elevation change)

Sources mapLIQJ, 91%5 mi, -59 ftLIRV, 6%27 mi, 915 ftLIQO, 3%38 mi, 2,001 ft© OpenStreetMap contributors

To get a sense of how much these sources agree with each other, you can view a comparison of Civitavecchia and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.