August 2020 In Review

August 2020 finished near to as much as four degrees above average on a whole across the area. An extended period of near to above average temperatures took place from the middle of the month until around the 27^th. Of note, Pierre reached 90 degrees 17 times this August (above average) compared to just one time last August (record fewest). Pierre’s warmest temperature this August was 106 F on the 25^th, which was the warmest day since July 9^th, 2017 (also 106 F).

Precipitation-wise, the area ranged quite a bit from pockets of up to 2” above average to pockets of up to 1.5” below average. Abnormally dry to drought conditions persisted or slightly worsened through the month for many, due to the generally spotty nature of precipitation. Thanks in part to the drier than average weather, the James River at Columbia finally fell below flood stage on August 30^th, after 518 consecutive days of being in flood stage (began March 31^st, 2019).

Two significant severe weather events took place late in the month. The first involved an overnight line of thunderstorms from the 27^th-28^th, responsible for 100+ mph wind gusts as well as tornadoes across central into east central South Dakota (https://www.weather.gov/abr/SummaryOfTheAugust26-282020SevereWeather). The second involved a significant tornado in Hand County on August 30^th (https://www.weather.gov/abr/August30_2020_Tornado).

*August 2020*
Temperature Data	Aberdeen	Sisseton	Wheaton	Watertown
Warmest Temperature / Date	96 / 22^nd	93 / 22^nd	89/13, 22, 23	92 / 23^rd
Coldest Temperature / Date	50 / 4^th	47 / 3, 4^th	53 / 3, 4^th	48 / 3^rd
Average High / Departure from Normal	86.3 / +4.5	82.4 / +1.6	81.5 / +0.8	82.2 / +2.3
Average Low / Departure from Normal	59.6 / +3.4	57.5 / +0.1	61.5 / +3.3	59.3 / +2.1
Monthly Average / Departure from Normal	73 / +4.0	70.0 / +0.9	71.5 / +2.1	70.7 / +2.1
Precipitation Data
Monthly Precipitation / Departure from Normal	1.19 / -1.24	2.28 / -0.16	3.83 / +1.01	1.82 / -0.96
Most Precipitation in 24 hours / Date	0.49 / 12^th	0.49 / 24^th	1.43 / 1^st	0.59 / 30^th
Monthly Snowfall / Departure from Normal	N/A	N/A	N/A	N/A
Most Snow in 24 hours / Date	N/A	N/A	N/A	N/A

Temperature Data	Pierre	Kennebec	Mobridge	Timber Lake
Warmest Temperature / Date	106 / 25^th	104 / 25^th	98/22,23,25	98 / 19, 25^th
Coldest Temperature / Date	45 / 31^st	45 / 31^st	49 / 29^th	43 / 31^st
Average High / Departure from Normal	90.0 / +2.7	91.7 / +3.3	88.4 / +3.6	88.0 / +2.6
Average Low / Departure from Normal	59.6 / -0.5	59.8 / -0.2	60.6 / +2.7	59.1 / +1.2
Monthly Average / Departure from Normal	74.8 / +1.1	75.6 / +1.4	74.5 / +3.1	73.8 / +2.2
Precipitation Data
Monthly Precipitation / Departure from Normal	1.12 / -0.68	1.16 / -0.77	1.04 / -0.99	2.27 / +0.56
Most Precipitation in 24 hours / Date	0.65 / 7^th	0.36 / 28^th	0.39 / 12^th	1.11 / 26^th
Monthly Snowfall / Departure from Normal	N/A	N/A	N/A	N/A
Most Snow in 24 hours / Date	N/A	N/A	N/A	N/A

Temperature departures from normal for August 2020, from the Midwestern Regional Climate Center

Daily max temperatures (values) and departures from normal (shading) in August for Aberdeen, Pierre and Watertown (in that order from top to bottom).

A new climate visualization tool from NWS Rapid City, SD which displays every year in the climate database as an individual dots. These dots are placed on the chart based on the number of 90+ degree days (x axis) and total precipitation (y axis), both year-to-date. Notice in the example below for Pierre how this year (larger white dot) falls near the cross hairs of the thickest red and green lines, which represent the average, whereas 2019 (the large grey dot) was an extreme in terms of very few 90+ degree days and nearly 25" of precipitation. This page has several different climate locations for viewing, and updates daily.

Precipitation totals (left) and departures from normal (right) for August 2020, from the Midwestern Regional Climate Center

US Drought Monitor, released August 27th, showing a large portion of Abnormally Dry or Moderate Drought across the area.

After a period of abnormally dry/drought conditions, the James River at Columbia finally fell below flood stage on August 30th (began March 31st, 2019).

A comparison of precipitation totals through Aug 31st between 2019 and 2020, etc.