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Average Weather in June in Sitka Alaska, United States

In Sitka, the month of June is characterized by gradually rising daily high temperatures, with daily highs increasing by 3°F, from 56°F to 59°F over the course of the month, and rarely exceeding 65°F or dropping below 51°F.

Daily low temperatures increase by 5°F, from 47°F to 51°F, rarely falling below 42°F or exceeding 55°F.

For reference, on August 11, the hottest day of the year, temperatures in Sitka typically range from 54°F to 62°F, while on February 23, the coldest day of the year, they range from 33°F to 41°F.

Average High and Low Temperature in June

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.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on June. The horizontal axis is the day, 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 June

Average Hourly Temperature in June in Sitka12 AM4 AM8 AM12 PM4 PM8 PM12 AM18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030MayJulchillycoldcool
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.

Clouds

The month of June in Sitka experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 66% throughout the month.

The clearest day of the month is June 20, with clear, mostly clear, or partly cloudy conditions 35% of the time.

For reference, on January 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on August 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 38%.

Cloud Cover in June

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. In Sitka, the chance of a wet day over the course of June is essentially constant, remaining around 38% throughout.

For reference, the year's highest daily chance of a wet day is 71% on October 31, and its lowest chance is 36% on June 21.

Probability of Precipitation in June

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during June in Sitka is essentially constant, remaining about 3.5 inches throughout, and rarely exceeding 5.9 inches or falling below 1.4 inches.

The lowest average 31-day accumulation is 3.4 inches on June 9.

Average Monthly Rainfall in June

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.

Sun

Over the course of June in Sitka, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 19 minutes, implying an average daily increase of 39 seconds, and weekly increase of 4 minutes, 32 seconds.

The shortest day of the month is June 1, with 17 hours, 29 minutes of daylight and the longest day is June 20, with 17 hours, 54 minutes of daylight.

Hours of Daylight and Twilight in June

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 latest sunrise of the month in Sitka is 4:15 AM on June 1 and the earliest sunrise is 10 minutes earlier at 4:05 AM on June 18.

The earliest sunset is 9:44 PM on June 1 and the latest sunset is 16 minutes later at 10:00 PM on June 23.

Daylight saving time is observed in Sitka during 2017, but it neither starts nor ends during June, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 4:06 AM and sets 17 hours, 54 minutes later, at 10:00 PM, while on December 21, the shortest day of the year, it rises at 8:38 AM and sets 6 hours, 42 minutes later, at 3:20 PM.

Sunrise & Sunset with Twilight in June

The solar day over the course of June. 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.

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.

The chance that a given day will be muggy in Sitka is essentially constant during June, remaining around 0% throughout.

For reference, on August 29, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in June

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 Sitka is essentially constant during June, remaining within 0.2 miles per hour of 4.5 miles per hour throughout.

For reference, on December 6, the windiest day of the year, the daily average wind speed is 7.5 miles per hour, while on July 18, the calmest day of the year, the daily average wind speed is 4.2 miles per hour.

Average Wind Speed in June

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The wind direction in Sitka during June is predominantly out of the south from June 1 to June 5 and the west from June 5 to June 30.

Wind Direction in June

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

Sitka 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 surface water temperature in Sitka is increasing during June, rising by 4°F, from 48°F to 52°F, over the course of the month.

Average Water Temperature in June

The daily average water temperature (purple line), 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 in Sitka is essentially constant during June, remaining within 0.1 kWh of 5.2 kWh throughout.

The highest average daily incident shortwave solar energy during June is 5.3 kWh on June 20.

Average Daily Incident Shortwave Solar Energy in June

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 Sitka are 57.053 deg latitude, -135.331 deg longitude, and 7 ft elevation.

The topography within 2 miles of Sitka contains large variations in elevation, with a maximum elevation change of 2,411 feet and an average elevation above sea level of 274 feet. Within 10 miles contains large variations in elevation (4,806 feet). Within 50 miles also contains extreme variations in elevation (58,976 feet).

The area within 2 miles of Sitka is covered by trees (49%), water (37%), and sparse vegetation (12%), within 10 miles by water (45%) and trees (39%), and within 50 miles by water (61%) and trees (27%).

Data Sources

This report illustrates the typical weather in Sitka year round, 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 Sitka.

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

The stations contributing to this reconstruction are: Sitka Rocky Gutierrez Airport (99%, 2.1 kilometers, west); Angoon Seaplane Base (0.7%, 67 kilometers, northeast); and Kake Airport (0.5%, 87 kilometers, east).

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 .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.