While the overall average St. Cloud September temperature (62.4°F, 3.8°F above average) did not equal the August average (64.6°F, 3.比平均温度低2华氏度)，9月的大部分天气更像夏天. 第22个最温暖的9月(2004年，2013年，2015年更温暖 was tied for the 4th warmest in St. Cloud records. There were two September days (88 on September 14; 89 on September 22) that were warmer than any August day (warmest: 86 degrees on August 1). 最高气温在80度以上的天数共有10天，但在8月份只有6天. 有四个闷热的夜晚气温低于60华氏度, including September 22, when the low was 70 degrees. This was the first St. Cloud low temperature of 70 degrees or warmer since September 5, 2015 这是过去三年来第二次出现如此温和的低点. 9月22日，最低气温70华氏度，平均气温80华氏度 set September 22 daily records. The warmth around September 21-24 明尼阿波利斯圣路易斯市最近连续三次达到90华氏度的高温. 保罗还有相当一部分地区降雨.

There were no freezing temperatures in St. Cloud through the end of the month. 只有明尼苏达州中北部和东北部的气温至少有一次低于32度 date of first 2017 frost from Midwest Regional Climate Center). The last 32 degree temperature in St. 5月1日乌云密布，因此圣路易斯市已经有153天没有霜冻. Cloud growing season so far. The first frost is now later than more than 70 percent of the last 30 growing seasons. Only 20 percent of the growing seasons has had at 150 frost-free days. 只要预报今晚有大雨，圣. 至少在10月的第二周之前，云中不太可能出现霜冻.

While September began on the dry side, 之前缓慢移动的锋面最终带来了相当强的降雨. The St. Cloud Airport had 2.93 inches of rain, still 0.53 inch below average. All but 0.18 inch fell after September 14 and 2.54 inches fell from September 20 on. 仅在圣塔芭芭拉北部和西部地区就有更多的降雨. 本月多地云量超过5英寸( red colors on September rainfall chart from the National Weather Service). The 明尼苏达州西北部和中西部有降雨 was important in helping to ease the summerlong drought conditions in northwestern Minnesota. 东部达科他州在9月份也得到了帮助，但西部地区需要更多的降雨.

October has the potential to begin with a major rainfall in central Minnesota今年9月，美国的降雨量可能与圣何塞整个9月的降雨量一样多. Cloud.

SThe relentless rain that produced the 2nd wettest August and the 5th rainiest summer in St. Cloud records 至少在9月上半月放缓了一段时间. 在9月的前两周，圣巴巴拉“只有”5天出现了可测量的降雨. Cloud. 在这个月的下半月，降雨和风暴变得更加频繁, 但是最大的一次降雨花了一天多的时间才落下 NWS September daily statistics for St. Cloud). While St. Cloud ended up with 1.9月21日至25日，距离缓慢移动的风暴44英寸，降雨量低于 在明尼阿波利斯北部和西北部郊区以及明尼苏达州中南部和东南部都可以看到大量的积雪. Because of these near misses, the St. 云地区机场的月总降雨量低于平均水平. The September amount was 3.08 inches, 0.38 inch below average. 这是自6月份以来首次出现降雨量低于平均水平的月份. 尽管如此，从7月开始的大量降雨已经产生了一个生长期(4月1日至9月30日).降雨量为46英寸，比平均降雨量高出5.5英寸. 明尼苏达州中部和南部的大部分地区的降雨量是平均生长季节的110到200%.

More Than Enough Rain for the Entire Year

With another inch of rain in early October, St. 现在云量已经超过了全年的平均降水量28.37 inches (4.93 inches above average through October 4). The annual average rainfall is 27.73 inches. And, St. 云错过了局部较强的降雨. 斯特恩斯县的大部分地区今年的降雨量超过30英寸，莫拉和穆斯湖以及东部双城地铁今年到目前为止的降雨量为35-40英寸，明尼苏达州中南部和东南部的降雨量为35-50英寸 year-to-date precipitation from the National Weather Service).

Still, St. 云现在已经有104天有可测量的降雨. The annual average is 97 days. 今年剩余时间的平均降水日数将使总降雨量达到120多天, high enough to crack the 15 years with the most frequent rainfall.

9月变暖可能成为全球最温暖的20个年份

干燥的天气伴随着持续的温暖. The average September temperature was 61.7°F, 3.1°F above average. 这恢复了整个冬季持续的高于正常温度的趋势( 8th warmest winter last year) and part of the spring. 如果气温仅仅在一年的最后三个月保持平均水平，那么2016年的平均气温将会下降. Cloud temperature would be 44.8华氏度，这将是圣. Cloud records and 0.2°F short of breaking into the 10 warmest years in St. Cloud.

Through October 4, there still hasn't been a frost in St. Cloud. 9月14日的最低气温是39度, 在这个早晨，布雷纳德湖的一些地方迎来了第一场霜冻. 第一次霜冻可能会在10月8日星期六到来. 这将使第一次霜冻在90%的范围内 among the latest 10% of years in St. Cloud records. 春天的最后一次霜冻是在5月15日，所以生长期至少要持续145天.

     September 2017 Statistics

在本周发布的河流水位报告中，低降雨量是相当明显的. The weekly DNR map shows streamflow in the lowest 10% from St. 雪本县和本顿县大部分地区阴云密布 . Currently, the Mississippi River level at St. Cloud is 4.17英尺，是该仪表所见的5个最低级之一(请注意 第三低水平出现在2007年9月 , which isn't listed in the records). The Sauk River in Waite Park is down to only 1.17英尺，是这条河第六低的水位. ( In August 2007 , the Sauk River was down to 0.37 feet) The streamflow from the USGS 显示密西西比河流域从艾特金到双子城的大部分站点现在都低于25%的标志, in the St. 克罗伊河流域，以及中部和下游的明尼苏达河流域. 在明尼苏达州中北部，河流流量现在处于最低的10%, including the Duluth, Grand Rapids, and Ely areas.

与此同时，温度数据显示，今年9月是我们没有经历过的夏天. So far , St. 云层正在影响70多年来最温暖的9月. Through yesterday, the average St. Cloud temperature has been 65.5°F, 7.1°F warmer than normal. 如果我们保持这样的温暖，今年九月将是 third warmest September in St. Cloud records and the warmest since 1931.