September Part Mid-July, Part Halloween While Dodging Rain

2018年9月 Saint 云 天气 Summary

2018年9月 lived up to nearly no expectations in St. 云. The first half of the month was more typical of mid-summer than the first 2 weeks of fall, then there was a sudden reversal during the second half of the month. The net result was an average September temperature of 60.4度在St. 云区域机场. 总数是1.8 degrees warmer than average

Two surges of warm and humid air kept lows in the 60's on two of the first 4 days of the month. 后来，圣. 云 posted a week of high temperatures no cooler than 83 degrees with 5 straight lows in the 60's. On 9月15日 and 16, St. 云 temperatures broke 90 degrees. While there were no temperature records set, only 6 Septembers since 1984 have had a 90度高. These were also the latest 90度高s recorded in St. 云 since the temperature reached 92 on September 19, 1998. The average temperature for the first 16 days of September was 68.0 degrees (average high 79.1、平均低56.9), which would have ranked as the warmest September in St. 云记录 如果它继续.

然后, the weather changed drastically as a wet weather system dumped rain and brought in significantly cooler air to the last 10 days of the month. High temperatures only reached 70 degrees on 2 of the 13 days of the month with the high failing to reach 45 degrees on a Halloween-ish 9月29日. That 44-degree high was one degree off the record cold high for the date. On the evening of September 28, the temperature fell back into the 20's, producing the first frost and readings bottomed out at 27 degrees on 9月29日. The September 28 date was within two days of the average first frost date. This did mark a hard freeze at the St. 云机场和是 6 days earlier than the average first 28 degree low. Still, the short duration of the temperature below 28 allowed the city of St. 云 to dodge a hard freeze.

The average temperature for the last 14 days of September was 51.7 degrees (average high 60.7、平均低点42.7). If that had kept up all month, it would have tied 1993 for the second coolest September.

Since the last frost of the spring was on April 28, the growing season was 152 days long, among the longest 20 percent of growing seasons.

St. 云 rainfall was well below average, but that was misleading as well. 圣. 云机场获得2分.17英寸的雨，1.比平均水平低29英寸. 这使圣。. 云 growing season rainfall (April 1-September 30) 18.47英寸，1.比平均水平低78英寸. The annual precipitation was 22.04英寸，1英寸.比平均水平低00英寸. However, there were over 4 inches of rain near Rice and Holdingford. 更重的总数 (mostly 5 inches of more) covered an area south of Montevideo, 本森, Willmar, 阿特沃特, Monticello and Elk River. Much of this heavier rain fell between September 3 and 5 and again on September 20. That day, there was also an outbreak of 16 tornadoes in south central and southeastern Minnesota.

    2018年9月 Statistics