This report describes the historical weather record at the Adelaide International Airport (Adelaide, Australia) during 1956. This station has records back to February 1955.
Adelaide has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (43%), croplands (19%), grasslands (18%), forests (10%), and built-up areas (8%)
Daylight saving time (DST) was not observed at Adelaide during 1956.
1956 was a leap year and thus has 366 days rather than the normal 365. Leap years occur every fourth year and the extra day is always February 29th. In 1956 February 29th falls on a Wednesday.
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 1956 they occurred on:
|Spring Equinox||Sunday, 23 September 1956.|
|Summer Solstice||Friday, 21 December 1956.|
|Fall Equinox||Tuesday, 20 March 1956.|
|Winter Solstice||Thursday, 21 June 1956.|
The hottest day of 1956 was January 8, with a high temperature of 98°F. For reference, on that day the average high temperature is 82°F and the high temperature exceeds 95°F only one day in ten. The hottest month of 1956 was February with an average daily high temperature of 84°F.
Relative to the average, the hottest day was February 22. The high temperature that day was 98°F, compared to the average of 81°F, a difference of 17°F. In relative terms the warmest month was February, with an average high temperature of 84°F, compared to an typical value of 81°F.
The longest warm spell was from March 20 to March 31, constituting 12 consecutive days with warmer than average high temperatures. The month of February had the largest fraction of warmer than average days with 62% days with higher than average high temperatures.
The coldest day of 1956 was June 23, with a low temperature of 37°F. For reference, on that day the average low temperature is 46°F and the low temperature drops below 39°F only one day in ten. The coldest month of 1956 was August with an average daily low temperature of 47°F.
Relative to the average, the coldest day was November 19. The low temperature that day was 45°F, compared to the average of 57°F, a difference of 12°F. In relative terms the coldest month was November, with an average low temperature of 53°F, compared to an typical value of 56°F.
The longest cold spell was from January 16 to January 24, constituting 9 consecutive days with cooler than average low temperatures. The month of November had the largest fraction of cooler than average days with 80% days with lower than average low temperatures.
The clearest month of 1956 was February, with 76% of days being more clear than cloudy. The longest spell of clear weather was from January 25 to February 5, constituting 12 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1956 was July, with 42% of days being more cloudy than clear. The longest spell of cloudy weather was from May 16 to May 20, constituting 5 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 1956 with the most precipitation observations was July 16. There were 8 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 June, with 33 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from February 7 to March 5, constituting 28 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was February, with 97% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was August, with 55% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 1956.
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 1956 was February with an average daily low humidity of 38%, and the most humid month was July with an average daily low humidity of 64%.
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 1956, January had 5 dry days, 26 comfortable days, and no humid days; April had no dry days, 30 comfortable days, and no humid days; July had 14 dry days, 17 comfortable days, and no humid days; and October had 16 dry days, 15 comfortable days, and no humid days.
The highest sustained wind speed was 40 mph, occurring on August 9; the highest daily mean wind speed was 29 mph (August 9);
The windiest month was April, with an average wind speed of 12 mph. The least windy month was May, with an average wind speed of 6 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 1956 with the lowest average visibility was July 27, with an average visibility of 5.8 mi. The month with the lowest average visibility was June, with an average visibility of 14.4 mi. With an average visibility of 22.2 mi, the month of December had the highest average visibility.
This station did not reliably report the cloud ceiling during 1956.