2004年7月圣克劳德天气摘要

寒意来了!

二零零四年七月圣云天气摘要    

      2004年7月是一个相当凉爽的月份. The average temperature at the Saint Cloud Regional Airport was 67.9°F, 1.比正常温度低9°F. This made this past month the coolest July since 1996. 然而, it was not extremely cold, compared to recent history. Four of the five Julys between 1992 and 1996 had a cooler average temperature, especially July 1992 which is the coldest July in Saint Cloud records 与 an average temperature of 63.1°F. The cool July was produced by two spells of chilly weather. The first one was a short period between July 5 and 8. 温度 were 9-14°F cooler than normal and included a tie for a record cool low on the 5th and a new record cool low on the 6th. 事实上, 7月6日的最高气温只有58华氏度, tying several days for the second coldest July high in Saint Cloud records. The only July day 与 a cooler high was July 3, 1927 when the high was only 57°F. The second chilly spell covered the last 10 days of the month. 在此期间, high temperatures were only slightly below normal, but there were three days 与 a low in the 40's, 包括7月24日和25日的46华氏度, resulting in one broken and one tied record low. During the rest of July, temperatures only rebounded to near normal, except for July 19-21. That three-day period was the closest we came to real summer heat when both of the 90°+F highs occurred 与 high humidity.

      The total rainfall for 2004年7月 was actually near normal. 一共3个.49 inches fell at the Saint Cloud Regional Airport, compared to the normal total of 3.34英寸. 然而, the rainfall was quite variable throughout the area because the rain was produced by thunderstorms. The Saint 澳门威尼斯人娱乐城 rain gauge picked up 4.22英寸. This brings the growing season (April 1 - July 31) rainfall at the Saint Cloud Airport to 15.18 inches, about two and a quarter inches above normal. 然而, 明尼苏达州生长期降雨量 from the 明尼苏达州 Climatology Office shows a dramatic change across central Minnesota. While rainfall has been above normal to the south and east of a Sandstone-Mora-Milaca-Sartell-Sauk Centre-Willmar-Granite Falls-Canby, conditions rapidly change to dry conditions to the north. A large part of north central interior Minnesota, 包括北部的米勒湖, 布雷纳德, 大急流城, 和铁山脉. In this area, growing season rainfall is at least 20% below normal. 最新的 干旱监测 from the National Drought Mitigation Center rates parts of the Iron Range into the Boundary Waters Canoe Area as extremely dry, 最低阶段的干旱.

     The rainfall total may have been near normal, but the number of rainy days was not. There were 10 days 与 measurable precipitation, about a day above normal. 到7月31日, there have been 72 days 与 measurable precipitation (可测量降水的历史天数)，在7个月内比正常水平高出13天. The normal number of days 与 measurable precipitation 这一年 is 97.3. 然而，情况瞬息万变. 去年的这个时候, there were 68 days 与 measurable precipitation, but a drastic change to dry conditions only produced 36 more days 与 precipitation.

     Three days (7月6日, 7月11日, and July 28th) produced most of the July rainfall. Each day had at least half an inch of rain 与 the latter two days totalling above an inch. The total precipitation on these three days was 2.95 inches, accounting for nearly 85% of the July rainfall. Saint Cloud is also well ahead of pace in days 与 heavy rainfall. 到7月31日, there have been 13 days 与 at least half an inch of rain; the normal annual days is 16.3 (至少为0的天数.50英寸). 到7月31日, there have been 5 日子至少有一寸 of rain. 一年的正常总数是5.5 (日子至少有一寸). 然而, the record number of 日子至少有一寸 of rain is 14 days, set in 1897.

      The cause of the cool weather 与 the long dry spells in July was the persistence of northwesterly steering winds from northwestern Canada into the southern Prairie Provinces and the Northern Plains for much of the month. This was especially true during the two intense cool periods. 即使西北风减弱了, we have tended to end up along the cool side of the boundary separating the hot, 潮湿的空气. With the frequent clouds and thunderstorms in the area, even though they often missed central Minnesota in July, high temperatures were kept down (only 6 above normal highs temperatures of 83°F during the month). This pattern should generally continue through the upcoming week 与 our temperatures near normal and humid 与 thunderstorms in the area through mid-week before the northwest flow pushes cooler air into central Minnesota during the second half of the week.

    二零零四年七月统计数字