Top 30 Warmest AUGUSTS - WINNIPEG (since 1873)

Rank	Daily high		Daily mean		Daily low		Rank
1	29.7	1983	22.5	1983	15.2	1983	1
2	29.5	1961	21.6	1961	14.8	1955	2
3	28.7	2003	21.6	2003	14.4	1947	3
4	28.4	1920	21.3	1949	14.4	1949	4
5	28.2	1949	21.3	1955	14.4	1969	5
6	28.2	1984	21.0	1920	14.4	2003	6
7	28.0	1991	21.0	1984	14.1	1959	7
8	28.0	1998	20.9	1930	13.9	1937	8
9	27.9	1930	20.9	1969	13.8	1930	9
10	27.8	2011	20.9	1991	13.8	1991	10
11	27.7	1915	20.8	1937	13.7	1953	11
12	27.7	1929	20.7	1998	13.7	1984	12
13	27.7	1955	20.3	2011	13.6	1920	13
14	27.6	1937	20.2	1929	13.6	1960	14
15	27.5	1990	20.2	1953	13.6	1961	15
16	27.3	1969	20.2	1988	13.6	1981	16
17	27.0	1988	20.1	1947	13.4	1925	17
18	27.0	2006	20.1	1959	13.3	1939	18
19	27.0	2012	20.1	1981	13.3	1998	19
20	26.9	1878	20.0	1990	13.2	1948	20
21	26.9	1889	19.9	1939	13.2	1988	21
22	26.9	1894	19.9	1973	13.1	1900	22
23	26.9	2018	19.9	1995 C	13.1	1931	23
24	26.8	1882	19.8	1948	13.1	1940	24
25	26.8	1995	19.8	1960	13.1	1957	25
26	26.7	1938	19.8	2006	13.1	1973	26
27	26.7	1953	19.7	1900	13.1	2014	27
28	26.7	1973	19.7	1922	13.0	1963	28
29	26.7	2020	19.7	1925	13.0	2008	29
30	26.6	1981	19.7	1940	13.0	2010	30

Data Notes:
1872 - James Stewart recorded an average high of about 27.7°C. I am unsure of the accuracy. The mean temperature graph includes 1872 using James Stewart's data. 
1995 - Erroneous low on the 1st (19.0°C) and erroneous high (22.7°C) on the 25th. Synops used as replacement (12.6°C low on the 1st and 23.4°C high on the 25th). The values from synops make more sense when compared with hourly observations. These corrections lowered the mean temperature for the month from 20.0°C to 19.9°C and the average low from 13.1°C to 12.9°C. 

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