This report describes the typical weather at the Pärnu Airport (Pärnu, Estonia) weather station over the course of an average year. It is based on the historical records from 2014 to 2017. Earlier records are either unavailable or unreliable.
Pärnu has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (66%), oceans and seas (18%), forests (12%), and croplands (3%).
Over the course of a year, the temperature typically varies from 17Â°F to 73Â°F and is rarely below 5Â°F or above 78Â°F.
The warm season lasts from May 21 to September 15 with an average daily high temperature above 64Â°F. The hottest day of the year is August 2, with an average high of 73Â°F and low of 59Â°F.
The cold season lasts from December 25 to February 13 with an average daily high temperature below 35Â°F. The coldest day of the year is January 15, with an average low of 17Â°F and high of 25Â°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 6:23 hours of daylight; the longest day is June 21 with 18:17 hours of daylight.
The earliest sunrise is at 4:14am on June 14 and the latest sunset is at 10:34pm on June 27. The latest sunrise is at 9:12am on December 28 and the earliest sunset is at 3:28pm on December 14.
Daylight saving time (DST) is observed in this location during 2017, starting in the spring on March 26 and ending in the fall on October 29.
The median cloud cover ranges from 38% (mostly clear) to 83% (mostly cloudy). The sky is cloudiest on December 1 and clearest on June 6. The clearer part of the year begins around March 26. The cloudier part of the year begins around October 13.
On June 6, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 51% of the time, and overcast or mostly cloudy 21% of the time.
On December 1, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 69% of the time, and clear or mostly clear 11% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around December 24, occurring in 66% of days. Precipitation is least likely around September 7, occurring in 26% of days.
Over the entire year, the most common forms of precipitation are moderate rain, light rain, moderate snow, and light snow.
Moderate rain is the most severe precipitation observed during 39% of those days with precipitation. It is most likely around June 13, when it is observed during 27% of all days.
Light rain is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around November 24, when it is observed during 20% of all days.
Moderate snow is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around January 22, when it is observed during 22% of all days.
Light snow is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around January 19, when it is observed during 19% of all days.
During the warm season, which lasts from May 21 to September 15, there is a 32% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (63% of days with precipitation have at worst moderate rain) and light rain (32%).
During the cold season, which lasts from December 25 to February 13, there is a 62% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate snow (31% of days with precipitation have at worst moderate snow), light snow (26%), moderate rain (18%), and light rain (14%).
The likelihood of snow falling is highest around January 22, occurring in 42% of days. The season in which it is relatively likely for snow to fall spans from November 6 to March 15.
Either snow rarely accumulates at this location or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 42% (comfortable) to 97% (very humid) over the course of the year, rarely dropping below 28% (dry) and reaching as high as 99% (very humid).
The air is driest around April 29, at which time the relative humidity drops below 50% (mildly humid) three days out of four; it is most humid around September 7, exceeding 95% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 15Â°F (dry) to 61Â°F (comfortable) and is rarely below 1Â°F (dry) or above 65Â°F (mildy humid).
The time of the year between May 23 and September 27 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 2 mph to 16 mph (light air to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 12 mph (gentle breeze) occurs around December 15, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around September 12, at which time the average daily maximum wind speed is 10 mph (gentle breeze).