Historical Weather For 1956 in Adelaide, Australia

Location

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%)

Calendar

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.

Temperature

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.

Temperature

The daily low (blue) and high (red) temperature during 1956 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 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.

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 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.

Cloud Coverage

The fraction of time spent in each of the five sky cover categories over the course of 1956 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 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.

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 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.

Precipitation Reports

The daily number of hourly observed precipitation reports during 1956, 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 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.

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 1956.

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 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.

Humidity

The daily low (brown) and high (blue) relative humidity during 1956 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 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.

Dew Point

The daily low (blue) and high (red) dew point during 1956 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 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.

Wind Speed

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

Visibility

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.

Visibility

The daily average visibility, depicted as gray bars encroaching down from the top of the graph.

Cloud Ceiling

This station did not reliably report the cloud ceiling during 1956.