September 1998 Saint Cloud Weather Summary

This Month's Daily Statistics

SUBJECT: Warmest September in 50 years
Saint Cloud September 1998 weather summary

September 1998 in Saint Cloud was an extremely warm month. The average
temperature of 62.9 degrees for the month was more than 5 and 1/2 degrees
above normal, making September 1998 the warmest September since 1948 and
placing this September 14th warmest out of the 119 years on record.

Most of the warmth came from high temperatures, which averaged over 8
degrees above normal. Two record daily highs were tied and there were three
days with highs of at least 90 degrees. This is the most number of 90-degree
high temperatures since 1978, which had 7 days (the all-time record). Also, it
makes for a rather strange warm season of 90+-degree highs. There were 8 days
this warm season with a high of 90+, but only 2 took place during the
meteorological summer (both in July). May had 3 90+ highs and September did
likewise. The only other year I could find with more 90+ highs outside of the
normal warmest months than during the normal summer was in 1978. Still, we had
only 8 90+ high days, which is 2 days below normal. This continues the trend
in the 1990's. Only 1995 has had at least 10 90+-days during the year.

Actually, September 1998 could have been even warmer. During the
first 19 days of September, the average temperature was 67.0 degrees, which
would have been the warmest September of all time. The average high for the
first 19 days was 82.0 degrees which is higher than the average high for any
summer month. However, two periods of cooler air surges dropped 1998 out of
the top 10.

Rainfall was relatively scarce in September 1998. Only 1.25 inches
fell, a little more than a third of the normal rainfall. It would have
been one of the 10 driest Septembers on record if not for the .41 inches
which fell with the cold front on the 30th. The dry conditions kept the
soil dry, enabling strong sunshine to raise the high temperature substantially,
despite some cool mornings.

The low September rainfall total continues the '90's trend of dry
Septembers. Seven of the 9 '90's Septembers have had less than normal rainfall
and 5 of these years have had less than 2 inches of rain. However, this
could be seen as counteracting the '80's trend in which 5 of the 10 years
had September rainfall between 4.3 and 9.4 inches.

SUMMARY FOR SEPTEMBER 1998             SEP 1998         NORMAL
Average high temperature ( F)           77.2             69.1
Average low temperature ( F)            48.6             45.4
Average temperature ( F)                62.9             57.3
Warmest high for this month ( F)        92 on the 19th 
Coolest high for this month ( F)        58 on the 21st, 30th
Mildest low for this month ( F)         64 on the 12th
Coldest low for this month ( F)         32 on the 22nd

Records broken:
Daily warm high                 91 (tie) on the 13th (previously in 1927, 1939)
                                88 (tie) on the 18th (previously in 1984)

September                               1.25              3.14
Greatest in 24 hours (Sept 1998)         .41 on the 30th

Historic temperature data provided courtesy of the Saint Cloud National Weather Service Office, and NOAA/NWS
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