The uncertainty arises mainly because weather stations were never intended to provide a climatic record.

原始数据的不确定性主要是因为气象站在以前不是以提供气温记录为目的的。

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NASA’s temperature series and another compiled by the U.S. National Climatic Data Center currently have 2005 as the warmest calendar year on record.

美国国家航空和航天局的温度数据系列和另一由美国国家气候数据中心得出的温度数据最近都把2005年作为有记录的历年来最热的。

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They note grass species, determine soil types and record climatic conditions.

他们注意草的种类，判断土壤类型，记录气候情况。

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Nationwide, there have been more than 4, 500 daily record highs in the last 30 days, according to the National Climatic Data Center.

CNN: Cold front breaks heat wave, brings storms

The cool-down follows a heat wave that roasted much of the country for more than a week and comes as the National Climatic Data Center reported the mainland United States has experienced the warmest 12 months since record-keeping began in 1895.

CNN: Northwest heat endangers crops

Nationwide, more than 4, 500 record-high daily temperatures have been set in the past 30 days, according to the National Climatic Data Center.

CNN: July 7, 2012 -- Updated 0222 GMT (1022 HKT)