This report describes the historical weather record at the Logan-Cache Airport (Logan, Utah, United States) during 2005. This station has records back to November 1981.
Logan, Utah has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by forests (47%), grasslands (35%), croplands (12%), and shrublands (4%)
Daylight saving time (DST) was observed at Logan, Utah during 2005. There were two time changes during 2005:
2005 was not a leap year, so it has 365 days and no February 29th. The first leap year before 2005 was 2004 and the first after was 2008.
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 2005 they occurred on:
|Spring Equinox||Sunday, 20 March 2005.|
|Summer Solstice||Tuesday, 21 June 2005.|
|Fall Equinox||Thursday, 22 September 2005.|
|Winter Solstice||Wednesday, 21 December 2005.|
The hottest day of 2005 was July 13, with a high temperature of 99°F. For reference, on that day the average high temperature is 90°F and the high temperature exceeds 97°F only one day in ten. The hottest month of 2005 was July with an average daily high temperature of 90°F.
Relative to the average, the hottest day was December 23. The high temperature that day was 49°F, compared to the average of 31°F, a difference of 18°F. In relative terms the warmest month was October, with an average high temperature of 63°F, compared to an typical value of 62°F.
The longest warm spell was from October 13 to October 28, constituting 16 consecutive days with warmer than average high temperatures. The month of November had the largest fraction of warmer than average days with 60% days with higher than average high temperatures.
The coldest day of 2005 was February 17, with a low temperature of -14°F. For reference, on that day the average low temperature is 17°F and the low temperature drops below 2°F only one day in ten. The coldest month of 2005 was February with an average daily low temperature of 8°F.
Relative to the average, the coldest day was February 17. The low temperature that day was -14°F, compared to the average of 17°F, a difference of 31°F. In relative terms the coldest month was February, with an average low temperature of 8°F, compared to an typical value of 17°F.
The longest cold spell was from February 22 to March 17, constituting 24 consecutive days with cooler than average low temperatures. The month of February had the largest fraction of cooler than average days with 79% days with lower than average low temperatures.
The longest freezing spell was from December 3 to December 19, constituting 17 consecutive days with temperatures strictly below freezing.
The clearest month of 2005 was July, with 97% of days being more clear than cloudy. The longest spell of clear weather was from June 13 to July 31, constituting 49 consecutive days that were clearer than they were cloudy.
The cloudiest month of 2005 was January, with 90% of days being more cloudy than clear. The longest spell of cloudy weather was from January 15 to January 31, constituting 17 consecutive days that were cloudier than they were clear.
This station reports the quantity of liquid precipitation but not observations of weather events in the area. For this reason, this section will only discuss the quantity of precipitation and not its type.
The day with the largest quantity of precipitation was April 28. That day saw 1.047" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.122". The month with the most precipitation was April, with 3.327", compared to a median value of 1.744".
As determined by quantitative measurements, the longest dry spell was from February 21 to March 19, constituting 27 consecutive days with no measured precipitation. The month with the largest fraction of dry days was July, with 97% of days reporting no measured precipitation at all.
The month with the largest fraction of days with at least some measured precipitation was December, with 48% of days reporting some measured precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 2005.
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 2005 was July with an average daily low humidity of 17%, and the most humid month was January with an average daily low humidity of 79%.
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 2005, 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 2 dry days, 29 comfortable days, and no humid days; and October had 31 dry days, no comfortable days, and no humid days.
The highest sustained wind speed was 31 mph, occurring on April 8; the highest daily mean wind speed was 19 mph (April 13); and the highest wind gust speed was 48 mph (April 7).
The windiest month was April, with an average wind speed of 6 mph. The least windy month was February, with an average wind speed of 1 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 2005 with the lowest average visibility was January 20, with an average visibility of 0.1 mi. The month with the lowest average visibility was February, with an average visibility of 3.1 mi. With an average visibility of 10.0 mi, the month of July 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 2005 with the lowest average cloud ceiling was January 20, with an average cloud ceiling of 98'. The month with the lowest average cloud ceiling was February, with an average cloud ceiling of 2262'. The month of July has the highest average cloud ceiling, with an average cloud ceiling of 10626'.