This report describes the historical weather record at the Jordan Airport (Jordan, Montana, United States) during 2012. This station has records back to March 1979.
Jordan, Montana has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (84%) and grasslands (15%)
Daylight saving time (DST) was observed at Jordan, Montana during 2012. There were two time changes during 2012:
2012 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 2012 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 2012 they occurred on:
|Spring Equinox||Tuesday, 20 March 2012.|
|Summer Solstice||Wednesday, 20 June 2012.|
|Fall Equinox||Saturday, 22 September 2012.|
|Winter Solstice||Friday, 21 December 2012.|
The hottest day of 2012 was July 3, with a high temperature of 105°F. For reference, on that day the average high temperature is 85°F and the high temperature exceeds 93°F only one day in ten. The hottest month of 2012 was July with an average daily high temperature of 93°F.
Relative to the average, the hottest day was January 5. The high temperature that day was 65°F, compared to the average of 31°F, a difference of 34°F. In relative terms the warmest month was March, with an average high temperature of 58°F, compared to an typical value of 45°F.
The longest warm spell was from January 21 to February 6, constituting 17 consecutive days with warmer than average high temperatures. The month of March had the largest fraction of warmer than average days with 84% days with higher than average high temperatures.
The coldest day of 2012 was December 26, with a low temperature of -18°F. For reference, on that day the average low temperature is 9°F and the low temperature drops below -15°F only one day in ten. The coldest month of 2012 was December with an average daily low temperature of 10°F.
Relative to the average, the coldest day was November 12. The low temperature that day was -6°F, compared to the average of 23°F, a difference of 29°F. In relative terms the coldest month was May, with an average low temperature of 38°F, compared to an typical value of 41°F.
The longest cold spell was from August 14 to August 22, constituting 9 consecutive days with cooler than average low temperatures. The month of May had the largest fraction of cooler than average days with 65% days with lower than average low temperatures.
The longest freezing spell was from December 22 to December 31, constituting 10 consecutive days with temperatures strictly below freezing.
This station did not reliably report the cloud coverage during 2012.
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 May 27. That day saw 0.720" of liquid (or liquid equivalent) precipitation, compared to a median value of 0.122". The month with the most precipitation was May, with 1.732", compared to a median value of 1.848".
As determined by quantitative measurements, the longest dry spell was from September 2 to October 3, constituting 32 consecutive days with no measured precipitation. The month with the largest fraction of dry days was September, 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 October, with 39% of days reporting some measured precipitation.
Either snow is exceptionally rare at this location or this station did not reliably report it during 2012.
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 2012 was August with an average daily low humidity of 18%, and the most humid month was November with an average daily low humidity of 58%.
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 2012, 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 4 dry days, 27 comfortable days, and no humid days; and October had 29 dry days, 2 comfortable days, and no humid days.
The highest sustained wind speed was 40 mph, occurring on May 6; the highest daily mean wind speed was 25 mph (October 17); and the highest wind gust speed was 59 mph (July 28).
The windiest month was April, with an average wind speed of 11 mph. The least windy month was December, with an average wind speed of 6 mph.
This station did not reliably report the visibility during 2012.
This station did not reliably report the cloud ceiling during 2012.