This report describes the historical weather record at the Los Angeles International Airport (Los Angeles, California, United States) during 1958. This station has records back to December 1947.
Los Angeles, California 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%), built-up areas (40%), shrublands (11%), and forests (5%)
Daylight saving time (DST) was observed at Los Angeles, California during 1958. There were two time changes during 1958:
1958 was not a leap year, so it has 365 days and no February 29th. The first leap year before 1958 was 1956 and the first after was 1960.
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 1958 they occurred on:
|Spring Equinox||Friday, 21 March 1958.|
|Summer Solstice||Saturday, 21 June 1958.|
|Fall Equinox||Tuesday, 23 September 1958.|
|Winter Solstice||Monday, 22 December 1958.|
The hottest day of 1958 was October 3, with a high temperature of 102°F. For reference, on that day the average high temperature is 74°F and the high temperature exceeds 82°F only one day in ten. The hottest month of 1958 was September with an average daily high temperature of 81°F.
Relative to the average, the hottest day was October 3. The high temperature that day was 102°F, compared to the average of 74°F, a difference of 28°F. In relative terms the warmest month was October, with an average high temperature of 81°F, compared to an typical value of 73°F.
The longest warm spell was from May 10 to September 23, constituting 137 consecutive days with warmer than average high temperatures. The month of June had the largest fraction of warmer than average days with 100% days with higher than average high temperatures.
The coldest day of 1958 was November 17, with a low temperature of 42°F. For reference, on that day the average low temperature is 54°F and the low temperature drops below 49°F only one day in ten. The coldest month of 1958 was January with an average daily low temperature of 50°F.
Relative to the average, the coldest day was November 17. The low temperature that day was 42°F, compared to the average of 54°F, a difference of 12°F. In relative terms the coldest month was March, with an average low temperature of 50°F, compared to an typical value of 52°F.
The longest cold spell was from February 26 to March 16, constituting 19 consecutive days with cooler than average low temperatures. The month of March had the largest fraction of cooler than average days with 81% days with lower than average low temperatures.
The clearest month of 1958 was September, with 77% of days being more clear than cloudy. The longest spell of clear weather was from September 4 to September 18, constituting 15 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1958 was July, with 45% of days being more cloudy than clear. The longest spell of cloudy weather was from August 27 to September 4, constituting 9 consecutive days that were cloudier than they were clear.
This station reports both the quantity of liquid precipitation and categorical observations of precipitation (e.g., moderate rain, or heavy snow). Both are subject to erroneous reports, but the former is particularly prone to false reports, especially ones indicating an excessive quantity of precipitation. Please bear this in mind when reading the extrema reported in this section.
The day with the largest quantity of precipitation was February 19. That day saw 3.492" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.225". The month with the most precipitation was February, with 6.291", compared to a median value of 2.409".
As determined by quantitative measurements, the longest dry spell was from May 12 to August 13, constituting 94 consecutive days with no measured precipitation. The months June, July, and November were completely without measured precipitation.
The month with the largest fraction of days with at least some measured precipitation was March, with 52% of days reporting some measured precipitation.
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 1958 with the most precipitation observations was March 15. There were 20 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 March, with 74 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from November 12 to December 27, constituting 46 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was May, 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 March, with 58% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 1958.
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 1958 was November with an average daily low humidity of 31%, and the most humid month was August with an average daily low humidity of 56%.
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 1958, January had 12 dry days, 19 comfortable days, and no humid days; April had 5 dry days, 25 comfortable days, and no humid days; July had no dry days, 31 comfortable days, and no humid days; and October had no dry days, 31 comfortable days, and no humid days.
The highest sustained wind speed was 35 mph, occurring on February 25; the highest daily mean wind speed was 20 mph (February 25);
The windiest month was April, with an average wind speed of 9 mph. The least windy month was December, with an average wind speed of 5 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 1958 with the lowest average visibility was February 16, with an average visibility of 0.4 mi. The month with the lowest average visibility was July, with an average visibility of 6.6 mi. With an average visibility of 15.5 mi, the month of March had the highest average visibility.
This station did not reliably report the cloud ceiling during 1958.