This report describes the historical weather record at the Goodyear Municipal Airport (Phoenix, Arizona, United States) during 1989. This station has records back to June 1987.
Phoenix, Arizona has a hot desert climate. The area within 25 mi of this station is covered by shrublands (93%), croplands (3%), and grasslands (2%)
Daylight saving time (DST) was not observed at Phoenix, Arizona during 1989.
1989 was not a leap year, so it has 365 days and no February 29th. The first leap year before 1989 was 1988 and the first after was 1992.
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 1989 they occurred on:
|Spring Equinox||Monday, 20 March 1989.|
|Summer Solstice||Wednesday, 21 June 1989.|
|Fall Equinox||Saturday, 23 September 1989.|
|Winter Solstice||Thursday, 21 December 1989.|
The hottest day of 1989 was July 4, with a high temperature of 115°F. For reference, on that day the average high temperature is 107°F and the high temperature exceeds 112°F only one day in ten. The hottest month of 1989 was July with an average daily high temperature of 106°F.
Relative to the average, the hottest day was April 7. The high temperature that day was 101°F, compared to the average of 82°F, a difference of 19°F. In relative terms the warmest month was April, with an average high temperature of 91°F, compared to an typical value of 85°F.
The longest warm spell was from March 6 to March 26, constituting 21 consecutive days with warmer than average high temperatures. The month of March had the largest fraction of warmer than average days with 81% days with higher than average high temperatures.
The coldest day of 1989 was January 1, with a low temperature of 29°F. For reference, on that day the average low temperature is 41°F and the low temperature drops below 34°F only one day in ten. The coldest month of 1989 was December with an average daily low temperature of 39°F.
Relative to the average, the coldest day was September 20. The low temperature that day was 57°F, compared to the average of 73°F, a difference of 16°F. In relative terms the coldest month was August, with an average low temperature of 78°F, compared to an typical value of 81°F.
The longest cold spell was from October 25 to November 11, constituting 18 consecutive days with cooler than average low temperatures. The month of December had the largest fraction of cooler than average days with 68% days with lower than average low temperatures.
The clearest month of 1989 was June, with 57% of days being more clear than cloudy. The longest spell of clear weather was from May 24 to May 29, constituting 6 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1989 was February, with 21% of days being more cloudy than clear. The longest spell of cloudy weather was from February 7 to February 11, 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 1989 with the most precipitation observations was January 4. There were 3 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 January, with 5 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from July 26 to October 21, constituting 88 consecutive days with no observed precipitation. The months February, April, June, August, September, and November were completely without observed precipitation.
The month with the largest fraction of days with at least some observed precipitation was January, with 10% of days reporting some observed precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 1989.
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 1989 was June with an average daily low humidity of 10%, and the most humid month was April with an average daily low humidity of 68%.
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 1989, January had 30 dry days, 1 comfortable day, and no humid days; April had 11 dry days, no comfortable days, and no humid days; July had 3 dry days, 23 comfortable days, and 5 humid days; and October had 19 dry days, 11 comfortable days, and 1 humid day.
The highest sustained wind speed was 32 mph, occurring on March 3; the highest daily mean wind speed was 26 mph (March 3); and the highest wind gust speed was 44 mph (March 3).
The windiest month was May, with an average wind speed of 10 mph. The least windy month was December, 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 1989 with the lowest average visibility was January 28, with an average visibility of 13.1 mi. The month with the lowest average visibility was December, with an average visibility of 31.9 mi. With an average visibility of 49.0 mi, the month of August had the highest average visibility.
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 1989 with the lowest average cloud ceiling was August 16, with an average cloud ceiling of 49'. The month with the lowest average cloud ceiling was January, with an average cloud ceiling of 11945'. The month of April has the highest average cloud ceiling, with an average cloud ceiling of 23115'.