<%@LANGUAGE="JAVASCRIPT" CODEPAGE="1252"%> August 2004 Saint Cloud Weather Summary
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This Month's Daily Statistics

Issued: Wednesday, September 1, 2004 8:47 AM

Subject: Saint Cloud Weather Summary for August 2004 and Summer 2004

Saint Cloud's Coldest August Since 1886

Tied for Fourth Coldest Summer on Record

     If you didn't like July 2004, you really hated August 2004. The upper-air flow that brought cool air frequently into central Minnesota in July became stronger and more persistent in August. For this reason, the average August temperature at the Saint Cloud Municipal Airport was only 62.3°F, 4.9°F colder than normal. This reading made August 2004 the second coldest August in 123 years of Saint Cloud temperature records.(Ten coldest/warmer Augusts are here.) The only August that has ever been colder was in the early settlement days of 1886 when the average temperature was more than three degrees colder than this past month. The August average high of 73.8°F and the average low of 50.8°F are the normal temperatures for September third and fourth.

     There were two major cold surges in August 2004 statewide. The first cold air surge was on August 9-15, and was marked by a cold air mass that had a lot of residual moisture. (See August 2004 daily highs and lows here.) The persistent cloud cover allowed Saint Cloud to tie or set three daily cold records, including the high of 57°F on August 10, tying August 21, 1966 and August 23-24, 1940 for the second coldest Saint Cloud August high temperature. The only colder high temperature was 55°F, set on August 25, 1958. (See August daily temperature records here.) The skies slowly cleared during the last 3 days of the outbreak, but clear skies allowed low temperatures to approach record lows in the 40's. In all, Saint Cloud had 5 days averaging more than 10 degrees below normal. While Saint Cloud fell two degrees short of its coldest August high temperature, International Falls had a high of only 49°F on August 10, setting a new August record for the coldest high temperature and marking only the 6th time the high temperature failed to reach 50°F in their history. (See NWS Duluth summary on this record.) Embarrass and Tower had low temperatures drop into the upper 20's, producing daily Minnesota record low temperatures on several dates.

    The second cold outbreak, on August 18-21, had drier, but colder air. For this reason, Saint Cloud high temperatures were able to climb to the upper 60's to low 70's, but plunged into the 30's on three straight mornings. (See August 2004 daily highs and lows here.) Four daily cold temperature records were set during this period (See August daily temperature records here.), plus the coldest August low temperature of 33°F was tied on August 21. The only other August day that has had a low of 33°F was August 31, 1974. While the official Saint Cloud thermometer escaped its first August frost ever, many neighboring cities and townsto the north and east of Saint Cloud had sub-freezing temperatures, including Brainerd, Pierz, and Garrison. In addition, many personal accounts from the rural areas to the north and east of Saint Cloud confirmed a frost and temperatures in the upper 20's. (See statement on cold August 19-21 lows from the State Climatology office). On this morning, Hibbing managed to set its coldest August low temperature in history with a reading of 27°F. The previous night, frost and, in some places a freeze with lows in the middle to upper 20's, hit the northern Red River Valley and other non-forested parts of northwest Minnesota. During this period, Embarrass again set three statewide daily record lows with the coldest being 20°F on August 21.

   Unlike many months of recent years, the cold statistics for August 2004 were representative of the entire month's weather. The high temperature never got above 83°F. The only high temperature that was more than 4°F above normal was Tuesday's (August 31st) 82°F, 8°F above normal.

     The cool August helped drag the meteorological summer (June 1 - August 31) average temperature to 64.4°F, 3.0°F colder than normal. So, summer 2004 tied the summer of 1945 as the fourth coldest summer in the 123 years of Saint Cloud temperature records.(Ten coldest/warmer summers are here.) (Note that the SCSU monthly temperature statistics are more complete than those of the NWS, so tied for 4th is the correct rank). In the past 90 summers, only the summer of 1992, the coolest summer on record, has been colder. While there have been only 4 highs of at least 90 degrees during this warm season, and one of these days was in April, there have now been 12 cold records set in July and August. There are now links to other Minnesota cold season statements including the coldest August and Summer 2004 on record at both Alexandria and International Falls, the 5th coldest August and 11th coldest summer in Duluth, the 6th or 7th coldest, at the bottom of this summary. Note that these links will move from temporary pages to permanent pages during the first couple of days of September.

    One weather statistic that has been underpublicized during the cool summer is the relative lack of rainfall. In August, only 1.64 inches fell at the Saint Cloud Regional Airport. This total, more than 2.3 inches below normal, was the 20th driest August in Saint Cloud history. Moreover, the summer 2004 rainfall ended up being just about three inches below normal. The growing season rainfall (April 1 - August 31) was very close to normal (16.82 inches of rain compared to the normal of 16.88 inches). Much like last year, most of the rain fell during a relatively short period. Between May 16 and June 16, 9.72 inches of rain fell, accounting for 58% of the warm season rain. Without the rainfall from those 32 days, this warm season has been more than 5.7 inches below normal. In fact, the monthly rainfall statistics through August look a lot like those from last year. The cause of this year's dryness has been the persistent northwest flow of weather from northern Canada. True moisture from the Gulf of Mexico has been pushed much further south than normal. So, when fronts come through, few of them have had access to enough moisture to produce widespread heavy rainfall. Given the sporadic nature of thunderstorms, areas have been frequently missed.

    The dry August has allowed the dry conditions in the north central part of the state to greatly expand over the past two months. The August 30 growing season precipitation map from the Minnesota State Climatology Office shows that the worst conditions remained from the northern half of Morrison County to Leech Lake and eastward through Grand Rapids and the Iron Range, similar to the area that has been short of rain all year. However, this dry area, with less than 80% of the normal rainfall, has spread into the Bemidji, Bagley, and Park Rapids. In addition, the area of slightly below normal rainfall has extended southwestward from Wheaton and Ortonville northwestward through Alexandria and Saint Cloud. In all of this area, rainfall has been short over the past month. However, conditions are not as bad as last year because of the cooler weather, which limits moisture loss due to evaporation.

    What are the consequences of the cool, dry weather this summer, aside from the complaints I get? The first consequence is the potential crop loss. The cool, rainy May and June delayed crop germination and the early frost has damaged much of the crops in northwestern Minnesota. Crop damage from the August 19-21 cold period is still being assessed in north central and central Minnesota.

     The cool conditions will apparently be good for the foliage, increasing the likelihood of leaves turning brightly at the same time. The negative factor is the dry conditions, tending to have leaves shrivel. Based on recent weather, there will be spectacular foliage viewing potential except possibly in the dry areas of north central Minnesota. However, that does not include the North Shore which has had plenty of rain.

     Finally, the dry conditions is of some immediate concern due to the hot and windy conditions expected later this week. This morning, these conditions are producing a red flag warning for a high forest fire danger in western North Dakota. While we won't get as hot, the combination of winds and heat will increase fire danger into the high to very high category on the Minnesota DNR wildfire forecast on Thursday and Friday.

    Ironically, weather conditions for the first few days of September are expected to approach levels we haven't seen for most of the summer. According to my latest forecast, high temperatures will be near normal on Wednesday, then well above normal at least on Thursday and Friday with a chance of 90 degrees for the first time since July 21 on both days.

Links to Other Cold August and Summer Statements

 

    August 2004 Statistics

Temperatures (°F)
August 2004
Normal
August 2004 Average High Temperature (°F)
73.8
78.9
August 2004 Average Low Temperature (°F)
50.8
55.5
August 2004 Mean Temperature for August (°F)
62.3*
*Second coldest August on record
67.2
August Extremes
Temperature(°F)
Date
Warmest High Temperature for August 2004 (°F)
83
August 1st,2nd
Coldest High Temperature for August 2004 (°F)
57 (broke daily record; see below)
August 10th
Warmest Low Temperature for August 2004 (°F)
62
August 24th
Coldest Low Temperature for August 2004 (°F)
33 (tied August record for coldest low in month; see below)
August 21st
Record Temperatures in August 2004
Temperature(°F)
Date
Old Record
August Record Cold High
33 (tied record)
August 21
August 31, 1974
Daily Record Cold High
57
August 10
66 in 1994
Daily Record Cold Average
54
August 10
57 in 1903
56 (tied record)
August 11
1964
51
August 20
53 in 1950
52
August 21
53 in 1923
Daily Record Cold Low
37
August 19
40 in 1950,1967
33
August 21
42 in 1923
Temperature Thresholds
Number of Days
Normal
August 2004 Days with High Temperatures >= 90°F
0
3.13
2004 Total Days with High Temperature of At Least 90°F
4
10.57
August 2004 Days with Low Temperatures >= 70°F
0
0.68
August 2004 Days with Low Temperatures >= 75°F
0
0.07
Precipitation (in)
August 2004
Normal
August 2004 Precipitation (in)
1.64
3.93
August Extremes
Precipitation (in)
Date
Most Daily Precipitation in August 2004
0.59
August 16th
Record Precipitation in August 2004
Precipitation (in)
Date
Old Record
No Precipitation Records Set
Precipitation Thresholds
Number of Days
Normal
August 2004 Days with Measurable (>= 0.01 inch) Precipitation
13
9.0
Total 2004 Days with Measurable (>= 0.01 inch) Precipitation
85
68.2
(Annual Normal: 97.3)
August 2004 Days with >= 0.10 inch Precipitation
4
5.6
August 2004 Days with >= 0.25 inch Precipitation
3
3.9
August 2004 Days with >= 0.50 inch Precipitation
1
2.4
Total 2004 Days with >= 0.50 inch Precipitation
14
12.7
(Annual Normal: 16.8)
August 2004 Days with >= 1.00 inch Precipitation
0
1.0
Total 2004 Days with >= 1.00 inch Precipitation
5
4.1
(Annual Normal: 5.5)

Summer (June 1-August 31) 2004 Statistics

Temperatures (°F)
Summer 2004
Normal
Summer 2004 Average High Temperature (°F)
75.3
79.3
Summer 2004 Average Low Temperature (°F)
53.4
55.4
Summer 2004 Mean Temperature for Summer (°F)
64.4*
67.4
Temperature Thresholds
Number of Days
Normal
Summer 2004 Days with High Temperatures >= 90°F
3
10.00
Summer 2004 Days with Low Temperatures >= 70°F
0
2.81
Summer 2004 Days with Low Temperatures >= 75°F
0
0.45

*tied with 1945 as the 4th coldest summer in Saint Cloud history

Link to Table of Top 10 Warmest/Coldest Summers
Liquid Equivalent Precipitation (in)
Summer 2004
Normal
Summer 2004 Precipitation (in)
8.80
11.78
2004 Heavy Rainfall Period (May 16 - June 16) (in)
9.72
4.16
2004 Growing Season (April 1 - August 31) Precipitation (in)
16.82
16.88
2004 Growing Season Without Rainiest 32 Days (May 16 - June 16)(in)
7.10
12.72
2004 Total Precipitation (in)
19.36
19.73
Precipitation Thresholds
Number of Days
Normal
Summer 2004 Days with Measurable (>= 0.01 inch) Precipitation
11
9.3
Summer 2004 Days with >= 0.10 inch Precipitation
17
18.9
Summer 2004 Days with >= 0.25 inch Precipitation
11
13.1
Summer 2004 Days with >= 0.50 inch Precipitation
7
7.8
Summer 2004 Days with >= 1.00 inch Precipitation
0
3.1

 



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Last updated: Wednesday, September 1, 2004 8:47 AM
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