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Mean temperature

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Mean Temperature The average of a series of temperatures taken over a period of time, such as a day or a month.
Measurable Precipitation of 0.01" or more.
Medium Range In forecasting, (generally) three to seven days in advance.

The average of temperature readings taken over a specified amount of time. Often the average of the maximum and minimum temperatures.

mean temperature (C)
The mean temperature in degrees Celsius (C) is defined as the average of the maximum and minimum temperature at a location for a specified time interval.
minimum relative humidity (%) ...

Mean temperature The average temperature of the air as indicated by a properly exposed thermometer for a given time period, usually a day, a month, or a year.

THICKNESS The thickness of a layer in the atmosphere is proportional to the mean temperature of that whole layer. The layer most often used in meteorology is between 1000 and 500 millibars.

Typically, heating degree days are calculated as how much colder the ~ at a location is than 65F on a given day. For example, if a location experiences a ~ of 55F on a certain day, there were 10 HDD (Heating Degree Days) that day because 65 - 55 = 10.

This is done by drawing a line through geographic points where the ~ for the warmest month (usually July) is equal to 51.4 - 0.1k, where k is equal to the ~ of the coldest month (usually January).

, 1953: The ~ of Central England, 1698 to 1952. Quart J Roy Meteorol Soc, 79, 242-261.
Manley, G. 1974: Central England Temperatures: monthly means 1659 to 1973. Quart J Roy Meteorolol Soc, 100, 389-405.
Parker, D. E., T. P. Legg, and C. K.

Degree Day- a measure of the departure of the daily mean temperature from the normal daily temperature; heating and cooling Degree Days are the departure of the daily mean temperature from sixty-five degrees Fahrenheit.
Dense Fog- a fog in which the visibility is less than one-quarter mile.

The increase in global ~, which is believed to be linked to the artificial increase in greenhouse gas concentrations.
Greenhouse gases
Gases which absorb some of the outgoing radiation from Earth and re-emit it back down towards earth. Act as a kind of insulator.

Degree days
Computed from each day's ~ (max+min/2). For each degree that a day's ~ is below or above a reference temperature is counted as one degree day.
The ratio of the mass of a substance to the volume occupied by it.

As already noted elsewhere, the values of the (total) thickness between levels at 500hPa and 1000hPa give a useful measure of the ~ of that layer.

Temperature variations over Australia during the past century have been consistent with global trends in showing an increase in the ~ (average of daytime maximum and overnight minimum temperatures) over most of the continent.

Monthly Climatic Data of the World (MCDW): This National Climatic Data Center (NCDC) publication contains monthly ~, pressure, precipitation, vapor pressure, and sunshine for approximately 2,000 surface data collection stations worldwide and monthly mean upper air temperatures, ...

A cooling degree day is given for each degree that the daily mean temperature departs above the baseline of 75 degrees Fahrenheit. It is used to estimate the energy requirements and is an indication of fuel consumption for air conditioning or refrigeration.

Hypsithermal - An extended mild episode between about 5000 and 7000 years ago when global ~ was somewhat higher (perhaps 1 Celsius degree) than at present.
Ice pellets - Frozen raindrops that bounce on impact with the ground; also called sleet.

a derived unit of measurement used to express the departure of the ~ for a day from a given reference (or base) temperature.
frozen ground or permafrost ...

The term refers to the ~ of the ocean in the upper few meters.
Seas ...

Example: If the weather has been cool, and the ~ is, say, 55 degrees, then there have 10 heating degree days (65 minus 55 equals 10). It is a good way to generally keep track of how much demand there has been for energy needed for either heating or cooling buildings.

Sea Surface Temperatures (SSTs) - The term refers to the ~ of the ocean in the upper few meters.

Growing Degree Day - A form of degree day to estimate the approximate dates when a crop will be ready to harvest. one growing degree day occurs when the daily mean temperature is one degree above the minimum temperature required for the growth of that specific crop.

However charts are also produced for thicknesses of other layers in the atmosphere as well. The thickness gives an indication of the ~ within a layer; lower thicknesses indicate colder air, higher thicknesses warmer air.

For example, if some location had a ~ of 60oF on day 1 and 80oF on day 2, there would be 5 HDD's for day 1 (65 minus 60) and 0 for day 2 (65 minus 80, set to 0). For the day 1 + day 2 period, the HDD total would be 5 + 0 = 5.

corals, ice cores and lake sediments, and historical documents, to reconstruct patterns of past surface temperature change. Due to the paucity of data in the Southern Hemisphere, recent studies have emphasized the reconstruction of Northern Hemisphere (NH) mean, rather than global ~s ...

See also: See also: What is the meaning of Temperature, Water, Surface, Cloud, Atmosphere?

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