It could be partly due to temperature change and weather patterns.
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The National Oceanic and Atmospheric Administration (Noaa) said that their analysis of temperature data from a global network of weather stations indicated that the average temperature for 2012 was 0.57C above the 20th Century average.
Crossing expanses never remotely surveyed, they will gather 2.25 million data points about salinity, water temperature, waves, weather, fluorescence and dissolved oxygen.
For example, scientists can tell by the way ice crystallizes what the weather and temperature was like thousands of years ago in ice core samples from polar regions.
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The timing presents a weather-temperature challenge for shoppers and retailers.
If a temperature reading can't account for wind, humidity and even how individuals experience weather, then an average temperature for a city is even more limited.
Baron understood well the relationships between lightning strikes and weather patterns, including temperature, precipitation and wind.
In recent weeks Dr Smith and Dr Sample, working with Scott Southwood, another researcher at the University of Washington, have built a weather sensor that measures temperature and light levels and sends a packet of data every five seconds by radio.
The strong cold front causing the severe weather brought huge extremes in temperature readings.
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The BBC weather centre said the highest temperature recorded so far on Sunday was 30.9 (87.6F) in Cambridge.
BeagleBone Weather Cape provides data including temperature, barometric pressure, humidity and ambient light.
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The coldest weather so far this winter is creeping over the northern United States this week, the National Weather Service said , sending the temperature plunging below zero in Chicago for the first time in 711 days.
The study analyzes various allergenic plants being grown in climate chambers modeling future conditions, and researchers are incorporating factors including weather patterns and changes in precipitation and temperature.
According to the National Weather Service, the current record high temperature for June in Manhattan's Central Park is 101 degrees, which was reached on June 27, 1966, and June 29, 1934.
During spring and fall, temperature extremes in the Atacama are mitigated, and the weather in Patagonia is relatively predictable.
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We factored in income tax rates and the weather in each metro on factors relating to temperature, precipitation and humidity.
In another demo, when the letter "w" was entered, a list of links offering the "weather" appeared along with images showing the temperature.
Baseball players deal with temperature variations between April and October, but any really bad weather day means a postponement.
Below the cameras is a weather-monitoring station to measure wind, humidity, temperature and radiation.
"We definitely have a temperature dichotomy across the U.S., " the National Weather Service said.
How will it affect local climates - the sum of temperature, rainfall, and everything else that makes up the local weather.
Hurtling towards the stratosphere the balloon was fitted with weather instruments designed to measure, among other things, temperature, pressure and wind speed.
Scientists say the temperature increase, in turn, is causing Atlanta to produce its own weather.
He recognizes that the established temperature authorities mentioned above today use data from only about 2, 000 weather stations, down from 6, 000 in 1970, which raises questions about their selections among available sites.
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Analysis in the 70s and 80s variously suggested that high pressure, high temperature and low humidity were associated with positive emotions - basically, nice weather seemed to put people in a good mood.
Weather Channel competitor Accuweather, meanwhile, uses an index it calls RealFeel Temperature, which it introduced in 1997.
You may have noticed Google's forecast feature on your HTML5-capable smartphone browser -- simply typing "weather" into the search field brings up a basic real-time temperature tool, complete with hourly and five-day forecasts for your current location.
As reported on the website Real Science, forty percent of weather stations in the Historical Climatology Network set their all-time record maximum temperature during the 1930s.
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Today Argo provides the first-ever global-scale, all-weather subsurface observations of the oceans, an unprecedented dataset for researchers studying the temperature, salinity, and circulation of the global oceans and how these change over periods ranging from days to decades.
In the meantime, Weather Channel has used a simpler measure, called "feels like, " to express temperature in a temperature-like number, taking into account wind chill at low temperatures and humidity at high temperatures.
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