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Average Weather at Geraldton (Greenstone Regional) Airport Canada

At Geraldton (Greenstone Regional) Airport, the temperature typically varies from -10°F to 74°F over the course of the year, and is rarely below -32°F or above 83°F.

The warm season lasts for 3.8 months, from May 20 to September 15, with an average daily high temperature above 61°F. The hottest day of the year is July 25, with an average high of 74°F and low of 54°F.

The cold season lasts for 3.0 months, from December 1 to March 2, with an average daily high temperature below 23°F. The coldest day of the year is January 28, with an average low of -10°F and high of 11°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 AMJanFebMarAprMayJunJulAugSepOctNovDecfrigidfrigidfreezingfreezingchillychillycoldcoldcoolcoolcomfortablecomfortable
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 at Geraldton (Greenstone Regional) Airport varies extremely over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 6 minutes of daylight; the longest day is June 21, with 16 hours, 20 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 5:39 AM on June 16, and the latest sunrise is 3 hours, 6 minutes later at 8:45 AM on December 31. The earliest sunset is at 4:46 PM on December 11, and the latest sunset is 5 hours, 13 minutes later at 10:00 PM on June 25.

Daylight saving time (DST) is observed at Geraldton (Greenstone Regional) Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

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

At Geraldton (Greenstone Regional) Airport, 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 at Geraldton (Greenstone Regional) Airport begins around April 14 and lasts for 6.1 months, ending around October 18. On August 2, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 62% of the time, and overcast or mostly cloudy 38% of the time.

The cloudier part of the year begins around October 18 and lasts for 5.9 months, ending around April 14. On February 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 83% of the time, and clear, mostly clear, or partly cloudy 17% of the time.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 1583%Feb 1583%Aug 238%Aug 238%Apr 1461%Apr 1461%Oct 1861%Oct 1861%overcastovercastmostly cloudymostly 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 at Geraldton (Greenstone Regional) Airport varies throughout the year.

The wetter season lasts 6.0 months, from April 28 to October 27, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 38% on July 7.

The drier season lasts 6.0 months, from October 27 to April 28. The smallest chance of a wet day is 10% on February 18.

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 at Geraldton (Greenstone Regional) Airport changes throughout the year.

Rain alone is the most common for 7.1 months, from April 5 to November 7. The highest chance of a day with rain alone is 38% on July 7.

Snow alone is the most common for 4.9 months, from November 7 to April 5. The highest chance of a day with snow alone is 15% on January 3.

Daily Chance of Precipitation

snowsnowrainrainsnowsnow0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 738%Jul 738%Feb 1810%Feb 1810%Apr 518%Apr 518%Nov 722%Nov 722%Jan 116%Jan 116%snowsnowmixedmixedrainrain
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. Geraldton (Greenstone Regional) Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.6 months, from March 30 to November 19, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 5, with an average total accumulation of 3.1 inches.

The rainless period of the year lasts for 4.4 months, from November 19 to March 30. The least rain falls around January 24, with and average total accumulation of 0.0 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.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day in the year. Geraldton (Greenstone Regional) Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 7.9 months, from September 25 to May 23, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around November 24, with an average total liquid-equivalent accumulation of 0.9 inches.

The snowless period of the year lasts for 4.1 months, from May 23 to September 25. The least snow falls around July 23, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

The average liquid-equivalent snowfall (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 rainfall.

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 perceived humidity level at Geraldton (Greenstone Regional) Airport, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 2% of 2% throughout.

Humidity Comfort Levels

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMar 50%Mar 50%Jul 254%Jul 254%comfortablecomfortabledrydry
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 at Geraldton (Greenstone Regional) Airport does not vary significantly over the course of the year, remaining within 0.3 miles per hour of 2.8 miles per hour throughout.

Average Wind Speed

0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mph4.5 mphJanFebMarAprMayJunJulAugSepOctNovDecApr 23.1 mphApr 23.1 mphJul 252.4 mphJul 252.4 mph
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 at Geraldton (Greenstone Regional) Airport varies throughout the year.

The wind is most often from the north for 3.5 months, from February 14 to May 29, with a peak percentage of 38% on April 16. The wind is most often from the south for 1.7 months, from May 29 to July 21 and for 2.6 months, from August 5 to October 25, with a peak percentage of 39% on August 27. The wind is most often from the west for 2.1 weeks, from July 21 to August 5 and for 3.6 months, from October 25 to February 14, with a peak percentage of 41% on January 6.

Wind Direction

WWNNSSWWSSWW0%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).

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 3.7 months, from April 30 to August 20, with an average daily incident shortwave energy per square meter above 5.3 kWh. The brightest day of the year is June 27, with an average of 6.5 kWh.

The darker period of the year lasts for 3.8 months, from October 22 to February 16, with an average daily incident shortwave energy per square meter below 2.0 kWh. The darkest day of the year is December 16, with an average of 0.8 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 Geraldton (Greenstone Regional) Airport are 49.778 deg latitude, -86.939 deg longitude, and 1,129 ft elevation.

The topography within 2 miles of Geraldton (Greenstone Regional) Airport is essentially flat, with a maximum elevation change of 69 feet, and an average elevation above sea level of 1,121 feet. Within 10 miles contains only modest variations in elevation (420 feet). Within 50 miles contains very significant variations in elevation (1,083 feet).

The area within 2 miles of Geraldton (Greenstone Regional) Airport is covered by trees (81%) and herbaceous vegetation (12%), within 10 miles by trees (88%), and within 50 miles by trees (89%).

Data Sources

This report illustrates the typical weather at Geraldton (Greenstone Regional) Airport, 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

Geraldton (Greenstone Regional) Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Pukaskwa, Katatota Island, Cameron Falls, and Armstrong Airport.

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 .