Climate and Average Weather Year Round at St. John's West CDA CS, Nfld. Canada

At St. John's West CDA CS, Nfld., the summers are short and comfortable; the winters are long, freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 18°F to 70°F and is rarely below 6°F or above 79°F.

Based on the tourism score, the best time of year to visit St. John's West CDA CS, Nfld. for warm-weather activities is from mid July to late August.

The warm season lasts for 2.9 months, from June 20 to September 16, with an average daily high temperature above 62°F. The hottest month of the year at St. John's West CDA CS, Nfld. is August, with an average high of 68°F and low of 54°F.

The cold season lasts for 3.9 months, from December 3 to March 31, with an average daily high temperature below 38°F. The coldest month of the year at St. John's West CDA CS, Nfld. is February, with an average low of 19°F and high of 31°F.

At St. John's West CDA CS, Nfld., 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 St. John's West CDA CS, Nfld. begins around June 27 and lasts for 5.4 months, ending around December 8.

The clearest month of the year at St. John's West CDA CS, Nfld. is September, during which on average the sky is clear, mostly clear, or partly cloudy 50% of the time.

The cloudier part of the year begins around December 8 and lasts for 6.6 months, ending around June 27.

The cloudiest month of the year at St. John's West CDA CS, Nfld. is May, during which on average the sky is overcast or mostly cloudy 69% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at St. John's West CDA CS, Nfld. varies throughout the year.

The wetter season lasts 5.6 months, from September 22 to March 10, with a greater than 36% chance of a given day being a wet day. The month with the most wet days at St. John's West CDA CS, Nfld. is November, with an average of 12.1 days with at least 0.04 inches of precipitation.

The drier season lasts 6.4 months, from March 10 to September 22. The month with the fewest wet days at St. John's West CDA CS, Nfld. is August, with an average of 9.6 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. Based on this categorization, the most common form of precipitation at St. John's West CDA CS, Nfld. changes throughout the year.

Rain alone is the most common for 9.1 months, from March 25 to December 27. The month with the most days of rain alone at St. John's West CDA CS, Nfld. is October, with an average of 11.5 days.

Snow alone is the most common for 1.5 months, from January 9 to February 24. The month with the most days of snow alone at St. John's West CDA CS, Nfld. is February, with an average of 4.7 days.

Mixed snow and rain is the most common for 1.4 months, from February 24 to March 25 and from December 27 to January 9. The month with the most days of mixed snow and rain at St. John's West CDA CS, Nfld. is January, with an average of 4.4 days.

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 of the year. St. John's West CDA CS, Nfld. experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at St. John's West CDA CS, Nfld.. The month with the most rain at St. John's West CDA CS, Nfld. is October, with an average rainfall of 4.2 inches.

The month with the least rain at St. John's West CDA CS, Nfld. is February, with an average rainfall of 1.5 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. St. John's West CDA CS, Nfld. experiences extreme seasonal variation in monthly snowfall.

The snowy period of the year lasts for 6.8 months, from October 29 to May 21, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at St. John's West CDA CS, Nfld. is February, with an average snowfall of 20.2 inches.

The snowless period of the year lasts for 5.2 months, from May 21 to October 29. The least snow falls around August 9, with an average total accumulation of 0.0 inches.

The length of the day at St. John's West CDA CS, Nfld. varies significantly over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 26 minutes of daylight; the longest day is June 20, with 15 hours, 58 minutes of daylight.

The earliest sunrise is at 5:03 AM on June 15, and the latest sunrise is 2 hours, 46 minutes later at 7:49 AM on January 2. The earliest sunset is at 4:09 PM on December 10, and the latest sunset is 4 hours, 53 minutes later at 9:02 PM on June 25.

Daylight saving time (DST) is observed at St. John's West CDA CS, Nfld. during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

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.

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 St. John's West CDA CS, Nfld., 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 3% of 3% throughout.

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 St. John's West CDA CS, Nfld. experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from October 13 to April 9, with average wind speeds of more than 12.2 miles per hour. The windiest month of the year at St. John's West CDA CS, Nfld. is January, with an average hourly wind speed of 15.0 miles per hour.

The calmer time of year lasts for 6.1 months, from April 9 to October 13. The calmest month of the year at St. John's West CDA CS, Nfld. is July, with an average hourly wind speed of 9.5 miles per hour.

The predominant average hourly wind direction at St. John's West CDA CS, Nfld. varies throughout the year.

The wind is most often from the south for 4.5 months, from April 8 to August 23, with a peak percentage of 42% on July 15. The wind is most often from the west for 7.5 months, from August 23 to April 8, with a peak percentage of 51% on January 1.

St. John's West CDA CS, Nfld. 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 2.4 months, from July 17 to September 28, with an average temperature above 52°F. The month of the year at St. John's West CDA CS, Nfld. with the warmest water is August, with an average temperature of 57°F.

The time of year with cooler water lasts for 5.0 months, from December 14 to May 15, with an average temperature below 37°F. The month of the year at St. John's West CDA CS, Nfld. with the coolest water is March, with an average temperature of 32°F.

To characterize how pleasant the weather is at St. John's West CDA CS, Nfld. 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 time of year to visit St. John's West CDA CS, Nfld. for general outdoor tourist activities is from mid July to late August, with a peak score in the first week of August.

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 St. John's West CDA CS, Nfld. for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.

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 at St. John's West CDA CS, Nfld. typically lasts for 4.9 months (150 days), from around May 23 to around October 20, rarely starting before April 29 or after June 15, and rarely ending before September 28 or after November 10.

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 at St. John's West CDA CS, Nfld. should appear around June 11, only rarely appearing before May 28 or after June 26.

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 11 to August 21, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest month of the year at St. John's West CDA CS, Nfld. is July, with an average of 6.0 kWh.

The darker period of the year lasts for 3.7 months, from October 29 to February 19, with an average daily incident shortwave energy per square meter below 2.0 kWh. The darkest month of the year at St. John's West CDA CS, Nfld. is December, with an average of 1.0 kWh.