This report describes the historical weather record at the Cedar City Regional Airport (Cedar City, Utah, United States) during 1980. This station has records back to November 1948.
Cedar City, Utah has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (50%), forests (30%), and grasslands (17%)
Daylight saving time (DST) was observed at Cedar City, Utah during 1980. There were two time changes during 1980:
1980 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 1980 February 29th falls on a Friday.
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 1980 they occurred on:
|Spring Equinox||Thursday, 20 March 1980.|
|Summer Solstice||Saturday, 21 June 1980.|
|Fall Equinox||Monday, 22 September 1980.|
|Winter Solstice||Sunday, 21 December 1980.|
The hottest day of 1980 was July 27, with a high temperature of 99°F. For reference, on that day the average high temperature is 89°F and the high temperature exceeds 95°F only one day in ten. The hottest month of 1980 was July with an average daily high temperature of 90°F.
Relative to the average, the hottest day was December 27. The high temperature that day was 66°F, compared to the average of 40°F, a difference of 26°F. In relative terms the warmest month was December, with an average high temperature of 53°F, compared to an typical value of 42°F.
The longest warm spell was from July 15 to August 14, constituting 31 consecutive days with warmer than average high temperatures. The month of December had the largest fraction of warmer than average days with 84% days with higher than average high temperatures.
The coldest day of 1980 was February 9, with a low temperature of 11°F. For reference, on that day the average low temperature is 22°F and the low temperature drops below 9°F only one day in ten. The coldest month of 1980 was December with an average daily low temperature of 26°F.
Relative to the average, the coldest day was March 31. The low temperature that day was 13°F, compared to the average of 31°F, a difference of 18°F. In relative terms the coldest month was March, with an average low temperature of 26°F, compared to an typical value of 29°F.
The longest cold spell was from March 25 to April 5, constituting 12 consecutive days with cooler than average low temperatures. The month of March had the largest fraction of cooler than average days with 61% days with lower than average low temperatures.
The clearest month of 1980 was October, with 71% of days being more clear than cloudy. The longest spell of clear weather was from September 19 to October 12, constituting 24 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1980 was January, with 77% of days being more cloudy than clear. The longest spell of cloudy weather was from January 5 to January 23, constituting 19 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 1980 with the most precipitation observations was February 7. There were 21 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 115 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from May 25 to June 30, constituting 37 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was June, 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 45% of days reporting some observed precipitation.
In this section we consider only those weather reports that indicate liquid precipitation. For the purposes of this analysis, we include thunderstorms even though some thunderstorms are not accompanied by liquid precipitation.
The month of 1980 with the largest number of those reports was February, with a total of 57 reports. The day with the largest number of those reports was February 14, with a total of 20 reports.
This station reports both when snow is observed to be falling and the measured depth of the snow on the ground. Both are subject to erroneous reports, but the latter is significantly less reliable. Please bear this in mind when reading this section.
In this section we consider hourly weather reports that contain an observation of falling snow. These reports do not necessarily correspond to accumulation.
The first reported snow fall in 1980 was on October 15; the last was on May 24. The month of 1980 with the largest number of those reports was January, with a total of 79 reports. The day with the largest number of those reports was February 7, with a total of 21 reports.
Snow depth on the ground is an optional and inconsistently reported part of standard weather reports. It is rarely reported more often than every six hours, it is often skipped, it is often reported erroneously, and a snow depth of zero is normally not distinguished from a missing report. These issues (particularly the last one) make it hard to collect statistics on snow depth with any confidence. To overcome this issue, we base our statistics on only those reports with present non-zero measurements of snow depth. Reports that fail to mention snow that is present, and reports that do not report snow depth because there is no snow on the ground are excluded because they cannot be distinguished from one another.
The first reported accumulation in 1980 was on December 7. The last day of the snow season with snow reported on the ground was March 28. The day with the deepest snow depth was February 7, with an average snow depth of 6.6" over the course of the day. The longest stretch of time during which there was always snow on the ground was from February 7 to February 11 (5 consecutive days).
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 1980 was June with an average daily low humidity of 11%, and the most humid month was January with an average daily low humidity of 54%.
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 1980, January had 31 dry days, no comfortable days, and no humid days; April had 30 dry days, no comfortable days, and no humid days; July had 22 dry days, 9 comfortable days, and no humid days; and October had 30 dry days, 1 comfortable day, and no humid days.
The highest sustained wind speed was 40 mph, occurring on January 10; the highest daily mean wind speed was 23 mph (January 10); and the highest wind gust speed was 59 mph (February 6).
The windiest month was June, with an average wind speed of 12 mph. The least windy month was October, 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 1980 with the lowest average visibility was January 19, with an average visibility of 4.8 mi. The month with the lowest average visibility was January, with an average visibility of 16.4 mi. With an average visibility of 24.5 mi, the month of June 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 1980 with the lowest average cloud ceiling was January 2, with an average cloud ceiling of 49'. The month with the lowest average cloud ceiling was January, with an average cloud ceiling of 9872'. The month of June has the highest average cloud ceiling, with an average cloud ceiling of 21862'.