This report describes the historical weather record at the Melbourne Airport (Melbourne, Australia) during 1972. This station has records back to July 1970.
Melbourne has a mild humid temperate climate with warm summers and no dry season. The area within 25 mi of this station is covered by croplands (50%), built-up areas (18%), forests (17%), grasslands (8%), and oceans and seas (8%)
Daylight saving time (DST) was observed at Melbourne during 1972. There were two time changes during 1972:
1972 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 1972 February 29th falls on a Tuesday.
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 1972 they occurred on:
|Spring Equinox||Friday, 22 September 1972.|
|Summer Solstice||Thursday, 21 December 1972.|
|Fall Equinox||Monday, 20 March 1972.|
|Winter Solstice||Wednesday, 21 June 1972.|
The hottest day of 1972 was December 20, with a high temperature of 102°F. For reference, on that day the average high temperature is 74°F and the high temperature exceeds 88°F only one day in ten. The hottest month of 1972 was February with an average daily high temperature of 78°F.
Relative to the average, the hottest day was December 20. The high temperature that day was 102°F, compared to the average of 74°F, a difference of 27°F. In relative terms the warmest month was September, with an average high temperature of 65°F, compared to an typical value of 61°F.
The longest warm spell was from April 28 to May 11, constituting 14 consecutive days with warmer than average high temperatures. The month of September had the largest fraction of warmer than average days with 67% days with higher than average high temperatures.
The coldest day of 1972 was June 15, with a low temperature of 32°F. For reference, on that day the average low temperature is 44°F and the low temperature drops below 38°F only one day in ten. The coldest month of 1972 was June with an average daily low temperature of 40°F.
Relative to the average, the coldest day was March 24. The low temperature that day was 40°F, compared to the average of 54°F, a difference of 14°F. In relative terms the coldest month was June, with an average low temperature of 40°F, compared to an typical value of 44°F.
The longest cold spell was from June 10 to June 26, constituting 17 consecutive days with cooler than average low temperatures. The month of June had the largest fraction of cooler than average days with 70% days with lower than average low temperatures.
The clearest month of 1972 was September, with 57% of days being more clear than cloudy. The longest spell of clear weather was from April 30 to May 8, constituting 9 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1972 was January, with 32% of days being more cloudy than clear. The longest spell of cloudy weather was from January 9 to January 13, 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 1972 with the most precipitation observations was February 16. There were 6 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 November, with 25 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from December 8 to December 22, constituting 15 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was December, with 84% of days reporting no observed precipitation at all.
The month with the largest fraction of days with at least some observed precipitation was July, with 48% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 1972.
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 1972 was December with an average daily low humidity of 33%, and the most humid month was June with an average daily low humidity of 60%.
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 1972, January had 3 dry days, 28 comfortable days, and no humid days; April had 11 dry days, 19 comfortable days, and no humid days; July had 31 dry days, no comfortable days, and no humid days; and October had 14 dry days, 17 comfortable days, and no humid days.
The highest sustained wind speed was 46 mph, occurring on July 24; the highest daily mean wind speed was 27 mph (February 2);
The windiest month was July, with an average wind speed of 14 mph. The least windy month was March, with an average wind speed of 8 mph.
This station did not reliably report the visibility during 1972.
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 1972 with the lowest average cloud ceiling was June 15, with an average cloud ceiling of 0'. The month with the lowest average cloud ceiling was November, with an average cloud ceiling of 2065'. The month of August has the highest average cloud ceiling, with an average cloud ceiling of 3963'.