This report describes the historical weather record at the Eppley Airfield (Omaha, Nebraska, United States) during 1984. This station has records back to January 1948.
Omaha, Nebraska has a humid continental climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (92%) and built-up areas (6%)
Daylight saving time (DST) was observed at Omaha, Nebraska during 1984. There were two time changes during 1984:
1984 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 1984 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 1984 they occurred on:
|Spring Equinox||Tuesday, 20 March 1984.|
|Summer Solstice||Thursday, 21 June 1984.|
|Fall Equinox||Saturday, 22 September 1984.|
|Winter Solstice||Friday, 21 December 1984.|
The hottest day of 1984 was July 8, with a high temperature of 100°F. For reference, on that day the average high temperature is 87°F and the high temperature exceeds 96°F only one day in ten. The hottest month of 1984 was August with an average daily high temperature of 89°F.
Relative to the average, the hottest day was December 28. The high temperature that day was 68°F, compared to the average of 32°F, a difference of 36°F. In relative terms the warmest month was February, with an average high temperature of 42°F, compared to an typical value of 37°F.
The longest warm spell was from February 7 to February 17, constituting 11 consecutive days with warmer than average high temperatures. The month of August had the largest fraction of warmer than average days with 74% days with higher than average high temperatures.
The coldest day of 1984 was January 20, with a low temperature of -13°F. For reference, on that day the average low temperature is 14°F and the low temperature drops below -3°F only one day in ten. The coldest month of 1984 was January with an average daily low temperature of 11°F.
Relative to the average, the coldest day was March 10. The low temperature that day was -4°F, compared to the average of 27°F, a difference of 31°F. In relative terms the coldest month was March, with an average low temperature of 23°F, compared to an typical value of 29°F.
The longest cold spell was from January 10 to January 23, constituting 14 consecutive days with cooler than average low temperatures. The month of March had the largest fraction of cooler than average days with 74% days with lower than average low temperatures.
The longest freezing spell was from January 8 to January 23, constituting 16 consecutive days with temperatures strictly below freezing.
The clearest month of 1984 was August, with 35% of days being more clear than cloudy. The longest spell of clear weather was from January 18 to January 22, constituting 5 consecutive days that were clearer than they were cloudy.
The cloudiest month of 1984 was March, with 94% of days being more cloudy than clear. The longest spell of cloudy weather was from March 11 to April 1, constituting 22 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 1984 with the most precipitation observations was April 2. There were 24 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 April, with 156 hourly present weather reports involving some form of precipitation.
As determined by the present weather reports, the longest dry spell was from August 10 to August 21, constituting 12 consecutive days with no observed precipitation. The month with the largest fraction of days without observed precipitation was August, with 84% 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.
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 1984 with the largest number of those reports was April, with a total of 148 reports. The day with the largest number of those reports was April 2, with a total of 22 reports.
This station reports when snow is observed falling but does not report the quantity of snow that has fallen or the depth of snow on the ground.
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 1984 was on October 16; the last was on April 29. The month of 1984 with the largest number of those reports was March, with a total of 97 reports. The day with the largest number of those reports was March 7, with a total of 18 reports.
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 1984 was August with an average daily low humidity of 40%, and the most humid month was January with an average daily low humidity of 66%.
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 1984, January had 31 dry days, no comfortable days, and no humid days; April had 26 dry days, 4 comfortable days, and no humid days; July had no dry days, 18 comfortable days, and 13 humid days; and October had 14 dry days, 17 comfortable days, and no humid days.
The highest sustained wind speed was 35 mph, occurring on January 29; the highest daily mean wind speed was 21 mph (December 12); and the highest wind gust speed was 51 mph (April 29).
The windiest month was April, with an average wind speed of 11 mph. The least windy month was August, with an average wind speed of 7 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 1984 with the lowest average visibility was February 11, with an average visibility of 1.4 mi. The month with the lowest average visibility was March, with an average visibility of 5.3 mi. With an average visibility of 8.1 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 1984 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 March, with an average cloud ceiling of 4487'. The month of August has the highest average cloud ceiling, with an average cloud ceiling of 15683'.