This report describes the historical weather record at the Greater Sudbury Airport (Greater Sudbury, Ontario, Canada) during 2013. This station has records back to July 1955.
Greater Sudbury, Ontario has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by forests (86%), lakes and rivers (6%), and croplands (5%)
Daylight saving time (DST) was observed at Greater Sudbury, Ontario during 2013. There were two time changes during 2013:
2013 was not a leap year, so it has 365 days and no February 29th. The first leap year before 2013 was 2012 and the first after was 2016.
The summer and winter solstices and the spring and fall equinoxes mark the passing of the seasons. They fall on nearly the same day each year, with differences of a day or two depending on the year. In 2013 they occurred on:
|Spring Equinox||Wednesday, 20 March 2013.|
|Summer Solstice||Friday, 21 June 2013.|
|Fall Equinox||Sunday, 22 September 2013.|
|Winter Solstice||Saturday, 21 December 2013.|
The hottest day of 2013 was July 16, with a high temperature of 91°F. For reference, on that day the average high temperature is 76°F and the high temperature exceeds 85°F only one day in ten. The hottest month of 2013 was July with an average daily high temperature of 77°F.
Relative to the average, the hottest day was January 12. The high temperature that day was 45°F, compared to the average of 17°F, a difference of 28°F. In relative terms the warmest month was October, with an average high temperature of 54°F, compared to an typical value of 50°F.
The longest warm spell was from October 6 to October 19, constituting 14 consecutive days with warmer than average high temperatures. The month of October had the largest fraction of warmer than average days with 61% days with higher than average high temperatures.
The coldest day of 2013 was January 23, with a low temperature of -33°F. For reference, on that day the average low temperature is 1°F and the low temperature drops below -18°F only one day in ten. The coldest month of 2013 was December with an average daily low temperature of 1°F.
Relative to the average, the coldest day was January 23. The low temperature that day was -33°F, compared to the average of 1°F, a difference of 33°F. In relative terms the coldest month was December, with an average low temperature of 1°F, compared to an typical value of 10°F.
The longest cold spell was from August 8 to August 19, constituting 12 consecutive days with cooler than average low temperatures. The month of December had the largest fraction of cooler than average days with 71% days with lower than average low temperatures.
The longest freezing spell was from December 6 to December 31, constituting 26 consecutive days with temperatures strictly below freezing.
The clearest month of 2013 was September, with 30% of days being more clear than cloudy. The longest spell of clear weather was from September 23 to September 29, constituting 7 consecutive days that were clearer than they were cloudy.
The cloudiest month of 2013 was March, with 81% of days being more cloudy than clear. The longest spell of cloudy weather was from February 22 to March 14, constituting 21 consecutive days that were cloudier than they were clear.
This station provides hourly reports of significant weather events at and around the station, but does not report the quantity of precipitation at the station itself. This is common for weather stations located outside of the United States, and for a small subset of stations in the United States that are located at lesser used and smaller airports.
This station reports when significant weather events (including precipitation) are visually observed at or near the station. Such events do not always correspond to measured quantities of liquid equivalent precipitation, such as when the event is near by not at the station, or in the case of solid precipitation that does not melt in the collection basin.
The day in 2013 with the most precipitation observations was January 19. There were 24 hourly weather reports that day (out of a maximum of 24) in which some form of precipitation was observated at or near the station. The month with the most precipitation observations was December, with 408 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from May 1 to May 10, constituting 10 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was May, with 65% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was December, with 94% of days reporting some observed precipitation.
In this section we consider only those weather reports that indicate liquid precipitation. For the purposes of this analysis, we include thunderstorms even though some thunderstorms are not accompanied by liquid precipitation.
The month of 2013 with the largest number of those reports was October, with a total of 129 reports. The day with the largest number of those reports was March 11, with a total of 24 reports.
This station reports when snow is observed falling but does not report the quantity of snow that has fallen or the depth of snow on the ground.
In this section we consider hourly weather reports that contain an observation of falling snow. These reports do not necessarily correspond to accumulation.
The first reported snow fall in 2013 was on October 22; the last was on May 23. The month of 2013 with the largest number of those reports was December, with a total of 390 reports. The day with the largest number of those reports was January 19, with a total of 24 reports.
Humidity is an important factor in determining how weather conditions feel to a person experiencing them. Hot and humid days feel even hotter than hot and dry days because the high level of water content in humid air discourages the evaporation of sweat from a person's skin.
When reading the graph below, keep in mind that the hottest part of the day tends to be the least humid, so the daily low (brown) traces are more relevant for understanding daytime comfort than the daily high (blue) traces, which typically occur during the night. Applying that observation, the least humid month of 2013 was May with an average daily low humidity of 43%, and the most humid month was December with an average daily low humidity of 67%.
But it is important to keep in mind that humidity does not tell the whole picture and the dew point is often a better measure of how comfortable a person will find a given set of weather conditions. Please see the next section for continued discussion of this point.
Dew point is the temperature below which water vapor will condense into liquid water. It is therefore also related to the rate of evaporation of liquid water. Since the evaporation of sweat is an important cooling mechanism for the human body, the dew point is an important measurement for understanding how dry, comfortable, or humid a given set of weather conditions will feel.
Generally speaking, dew points below 50°F will feel a bit dry to some people, but comfortable to people accustomed to dry conditions; dew points from 50°F to 68°F are fairly comfortable to most people, and dew points above 68°F are increasingly uncomfortable, becoming oppressive around 77°F.
To take some examples, and basing our categorization on the daily high dew point in 2013, January had 31 dry days, no comfortable days, and no humid days; April had 27 dry days, 3 comfortable days, and no humid days; July had 2 dry days, 23 comfortable days, and 6 humid days; and October had 18 dry days, 13 comfortable days, and no humid days.
The highest sustained wind speed was 33 mph, occurring on January 30; the highest daily mean wind speed was 22 mph (December 22); and the highest wind gust speed was 52 mph (January 30).
The windiest month was November, with an average wind speed of 13 mph. The least windy month was August, with an average wind speed of 8 mph.
Visibility is the maximum distance at which a given reference object or light can be clearly discerned. In the United States, visibilities that are greater than or equal to 10 miles are typically reported as 10 miles.
The day of 2013 with the lowest average visibility was October 31, with an average visibility of 0.7 mi. The month with the lowest average visibility was January, with an average visibility of 11.3 mi. With an average visibility of 16.0 mi, the month of June had the highest average visibility.
The cloud ceiling is the altitude of the lowest layer of clouds that are at categorized as broken (mostly cloudy) or overcast (cloudy). If no such cloud layer exists then the ceiling is unlimited and no value is reported.
The day of 2013 with the lowest average cloud ceiling was October 31, with an average cloud ceiling of 146'. The month with the lowest average cloud ceiling was January, with an average cloud ceiling of 4370'. The month of May has the highest average cloud ceiling, with an average cloud ceiling of 12907'.