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本月每日统计
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日期:2000年10月2日
SUBJECT: Driest 9月 Since 1952 Further Fuels Drought
Saint 云 9月 2000 weather summary
The localized drought in east central Minnesota continued through 9月 in St. 云. The Saint 云 Municipal Airport only received 0.93 inches of rainfall during 9月, more than 2.比正常低2英寸. This low rainfall tied 1923 for the 9th driest 9月 on record and was the driest 9月 since 1952, the driest 9月 in 108 years of St. 云天气记录(见下表). There were no really large rainfall events during the past month. 下雨最多的一天是9日，那天圣. 云收到 .离雷雨还有35英寸.
圣. 云 area missed a potential major rainfall event on the 22nd and 23rd. A storm system set up an inverted trough, a focus of ongoing research by the 国家气象局 Sioux Falls Office and SCSU. This feature distorted the normal frontal rainfall distribution, so only the northwestern and the southeastern parts of Minnesota received significant rain. 相反，从圣巴巴拉开始的干旱地区. 云 to the northern Twin Cities suburbs got less than 0.2英寸.
干燥的九月离开了圣. 云 with a 2000 growing season (Apr 1- Sep 30) of 12.46英寸，比正常水平低了近8英寸. This is the 6th lowest growing season rainfall in St. 云 in the 109 years of records (see table below). Combined with the rainfall deficit from last fall (2.1英寸)，St. 云 is now more than 10 inches of rainfall behind during the growing season since 9月 of last year. 也, 请注意，过去10年中有3年(1992年), 1996, 2000) rank in the 7 driest growing seasons to date.
The average temperature during 9月 2000 in St. 云是57岁.6 degrees, which was very close to normal. This means that the cold outbreak of 9月 20-27 (highs of 61 or colder on 6 days; lows in the 20's on 3 mornings) was balanced by 8 days with highs in the 80's including 3 days in a row twice (Sept 16-18 and Sept 28-30). Note, however, that the average high (71.9度)等于2.8 degrees above normal while the average low (43.2度)等于2.比正常低2度. This range of temperatures can be attributed to the dry conditions: less water vapor in the air means more of the sun's heat gets through during the day and more of the earth's warmth escapes at night. The "jaw dropper" of temperature range occurred on the 16th with an afternoon high of 85 after a morning low of 35. Four other days had a high at least 40 degrees warmer than the low.
The growing season came to an abrupt halt in St. 云 with a 28 degree low on the morning of 9月 21. Whatever survived stopped 3 days later thanks to a record cold low of 24 on the 24th. While the first frost was close to the normal date of 9月 26, the late start to the growing season with the last frost coming with a record low of 28 on May 19, led to a frost-free season which was more than 2 weeks shorter than normal and a freeze-free season which was more than a month shorter than normal (see table below). The late freeze was also indicative of the rather cool conditions which dominated large portions of May and June.
SUMMARY FOR SEPTEMBER 2000 SEP 2000 NORMAL
温度
Average high temperature ( F) 71.9 69.1
Average low temperature ( F) 43.2 45.4
Average temperature ( F) 57.6 57.3
Warmest high for this month ( F) 89 on the 9th
Coolest high for this month ( F) 50 on the 23rd
Mildest low for this month ( F) 61 on the 9th
Coldest low for this month ( F) 24 on the 24th (broke record;
见下文)
记录了:
Daily high temperature: 88 (tie) on the 18th (1984 and 1998)
Daily low temperature: 24 on the 24th (old record: 25 in 1942)
降水(中)
9月 .93* 3.14
24小时内最高纪录(2000年9月) .9日35分
Growing season rainfall (Apr 1-Sep 30) 12.46** 20.32
*-(tie) 9th driest Sept on record (见下文)
**-6th driest growing season thru Sep 30 (见下文)
生长期统计
Temperature cutoff last day in spring first day in fall no of days
32度
2000 May 19 Sept 21 125
normal May 10 Sept 26 142
28度
2000 May 19 Sept 21 125
normal April 28 Oct 8 161
ST. CLOUD PRECIP--SEPTEMBER (108 YEARS; AVG = 2.95 IN; SDEV = 1.88 IN)
WETTEST DRIEST
10.72 IN 1926 0.07 IN 1952
9.48 IN 1985 0.68 IN 1943
7.12 IN 1900 0.74 IN 1922
6.60 IN 1929 0.78 IN 1932
6.55 IN 1983 0.80 IN 1919
6.49 IN 1914 0.81 IN 1893
6.28 IN 1986 0.84 IN 1918
6.12 IN 1934 0.90 IN 1935
6.10 IN 1921 0.93 IN 1923
5.99 IN 1980 0.93 IN 2000 <-- TIED 9TH DRIEST;
48年来最干旱的一次
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生长季节降水:4月1日至9月30日
Avg = 19.95 sdev = 4.99; 111 YRS; 108 GOOD YRS
10 DRIEST GROWING SEASONS - APR 1-SEP 30
10.52 1922
10.58 1976
11.29 1931
11.57 1996
12.33 1910
12.46 2000 <--6TH DRIEST; 3RD YR IN 1991-2000
12.47 1992
13.82 1930
14.16 1950
14.17 1933
10 WETTEST GROWING SEASONS - APR 1-SEP 30
26.71 1906
26.73 1912
27.17 1990
27.44 1928
27.98 1926
28.77 1985
28.83 1903
29.76 1897
30.70 1905
30.90 1965
31.17 1986
