Historical Weather For 1972 in Melbourne, Australia

Location

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%)

Calendar

Daylight saving time (DST) was observed at Melbourne during 1972. There were two time changes during 1972:

  • DST ended on Sunday February 27, 1972 at 2:00 am, from EST (GMT+11) to EST (GMT+10).
  • DST started on Sunday October 29, 1972 at 3:00 am, from EST (GMT+10) to EST (GMT+11).

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.

Temperature

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.

Temperature

The daily low (blue) and high (red) temperature during 1972 with the area between them shaded gray and superimposed over the corresponding averages (thick lines), and with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile). The bar at the top of the graph is red where both the daily high and low are above average, blue where they are both below average, and white otherwise.

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.

Hourly Temperature Bands

The full year of hourly temperature reports with the days of the year on the horizontal and the hours of the day on the vertical. The hourly temperature measurement is color coded into meaningful temperature bands: frigid is purple (below 15°F), freezing is blue (15°F to 32°F), cold is dark green (32°F to 50°F), cool is light green (50°F to 65°F), comfortable is yellow (65°F to 75°F), warm is light red (75°F to 85°F), hot is medium red (85°F to 100°F), sweltering is dark red (above 100°F), and missing data is pink.

Clouds

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.

Cloud Coverage

The fraction of time spent in each of the five sky cover categories over the course of 1972 on a daily basis. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data. The bar at the top of the graph is gray if the sky was cloudy or mostly cloudy for more than half the day, blue if it is clear or mostly clear for more than half the day, and blue-gray otherwise.

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.

Hourly Cloud Coverage

The full year of hourly cloud coverage reports with the days of the year on the horizontal and the hours of the day on the vertical. The sky cover is color coded: from most blue to most gray, the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

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.

Present Weather Reports

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.

Precipitation Reports

The daily number of hourly observed precipitation reports during 1972, color coded according to precipitation type, and stacked in order of severity. From the bottom up, the categories are thunderstorms (orange); heavy, moderate, and light snow (dark to light blue); heavy, moderate, and light rain (dark to light green); and drizzle (lightest green). Not all categories are necessarily present in this particular graph. The faint shaded areas indicate climate normals. The bar at the top of the graph is green if any precipitation was observed that day and white otherwise.

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.

Hourly Weather Reports

The full year of hourly present weather reports with the days of the year on the horizontal and the hours of the day on the vertical. The color-coded categories are thunderstorms (orange); heavy, moderate, and light snow (dark to light blue); heavy, moderate, and light rain (dark to light green); drizzle (lightest green); freezing rain and sleet (light and dark cyan); snow grains (lightest blue); hail (red); fog (gray); and haze (brownish gray).

Snow

Either snow is exceptionally rare at this location or this station did not reliably report it during 1972.

Humidity

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.

Humidity

The daily low (brown) and high (blue) relative humidity during 1972 with the area between them shaded gray and superimposed over the corresponding averages (thick lines), and with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Dew 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.

Dew Point

The daily low (blue) and high (red) dew point during 1972 with the area between them shaded gray and superimposed over the corresponding averages (thick lines), and with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

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.

Wind Speed

The daily low and high wind speed (light gray area) and the maximum daily wind gust speed (tiny blue dashes).

Other Measurements

This station did not reliably report the visibility during 1972.

Cloud Ceiling

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'.

Cloud Ceiling

The daily average cloud ceiling, depicted as gray bars encroaching down from the top of the graph. Missing data or days with insufficient clouds to define a cloud ceiling are shown as white columns.