STATISTICS from CTO Weather Centre - May, 2025
MONTHLY SUMMARY: MEANS AND TOTALS:
Reading
Mean
Normal
RecHi
YY
RecLo
YY
High Temp
2022
2002
Low Temp
2024
2002
Mean Temp
2022
2002
Dew Point
2024
2017
Relative Humidity
63
%
56
%
68
%
2024
44
%
2023
Barometric Pressure
2023
2017
Winds
2023
2002
- from
SSW
W
WNW
N
Total Reading
Total
Normal
RecMost
YY
RecLeast
YY
Rain
2022
2012
Snow
2015
2015
- Water Equivalent
2012
2012
Precipitation
2022
2012
Sunshine
92
h
91
h
372
h
2016
0
h
2002
MONTHLY SUMMARY: SINGLE-DAY EXTREMES AND RECORDS:
Reading
Highest
DD
Lowest
DD
RecHi
YY-DD
RecLo
YY-DD
High Temp
16
08
2020-27
2002-14
Low Temp
15
01
2020-27
2020-09
Humidex
16
2020-27
Wind Chill
n/a
2021-01
Dew Point
16
11
2015-05
2019-01
Relative Humidity
98
%
06
16
%
11
99
%
2013-23
1
%
2017-01
Barometric Pressure
11
17
2023-26
2023-01
Winds
02
2022-21
- from
ESE
W
Daily Total
Most
DD
RecMost
YY-DD
Rain
06
2023-01
Snow
01
2002-01
- Water Equivalent
01
2002-01
Precipitation
06
2023-01
Sunshine
14:05
h
11
22:00
h
2020-20
Daily Mean
Highest
DD
Lowest
DD
RecHi
YY-DD
RecLo
YY-DD
Temperature
16
08
2020-27
2002-14
Dew Point
16
11
2024-22
2017-01
Relative Humidity
84
%
18
38
%
11
87
%
2015-11
1
%
2017-01
Barometric Pressure
11
17
2023-26
2023-01
Winds
05
15
2023-01
2002-01
- from
W
E
NNW
N
EVENTS THIS MONTH (11):
First Quarter - May 4 @ 00:51
A waxing half-Moon is near the meridian (halfway across the sky) as the Sun sets.
Holland Liberated - May 7 @ 01:00
On this day in 1945, Canada accepted the surrender of German forces in the Netherlands, after a months-long campaign to dislodge them. This effort sparked a close and enduring friendship between the two countries.
V-E Day - May 8 @ 01:00
Victory-in-Europe Day celebrates the 1945 surrender by Nazi Germany to the Allied Forces. This had followed a vicious battle for the city of Berlin, and came little more than a week after Adolph Hitler had taken his own life.
Manitoba and NWT Join Confederation - May 12 @ 01:00
Today marks 155 years since Manitoba and the North West Territories joined the Canadian Confederation in 1870.
Full Moon - May 12 @ 04:55
The Moon is most-opposite the Sun in the sky, rising as the sun sets.
Eruption of Mt. St. Helens - May 18 @ 01:00
On this day in 1980 (now 45 years ago), Mount Saint Helens, a beautiful, symmetrical stratovolcano cone often referred to as "the Fuji of the Northwest," erupted explosively after months of signs that it was waking up. The eruption was triggered by a huge landslide, and the mountain blew away its summit and the southern quadrant of its cone. In many areas, for the next couple of days, it was pitch-black from the clouds of volcanic dust. Huge lahars washed down many rivers, and the showpiece of the area, Spirit Lake, was drowned in boiling debris. The eruption was extensively covered by international media. Subsequent smaller eruptions carried ash up into Canada. The sound of the eruption was heard up to 320 kilometres away, including by the Author, as he delivered papers on southern Vancouver Island.
Last Quarter - May 19 @ 23:58
A waning half-Moon is near the meridian (halfway across the sky) as the Sun rises.
Candian Derecho of 2022 - May 21 @ 01:00
On this date, in 2022, a derecho hit southern Ontario and Quebec, with winds up to 190 km/h and a number of tornadoes. Damage was widespread, with many trees down and the power grid severely damaged. The Author experienced this storm, and classed it alongside Post-Tropical Storm Blanche, in 1975.
New Moon - May 26 @ 03:02
The Moon is nearest the Sun in the sky and cannot be seen from the ground.
Victoria Day - May 19 @ 00:00
Canada takes a holiday on this date, in celebration of the life and accomplishments of Her Majesty, Queen Victoria (1819-05-24 - 1901.01.22).
Barrie Tornado - May 31 @ 01:00
Today marks 40 years since a major tornado ripped through the city of Barrie, Ontario, in 1985, causing 8 deaths and $150-million in damage.
Daily Temperatures This Month:
Daily Precipitation This Month:
This Month:
Day
High
Low
Mean
MxHx
MnWC
AvRH
AvDP
AvBP
Prec
Sunrise
Sunset
Sun
Moon
Winds
1
56%
05:51
20:10
06:15 h
Waxing Crescent
E @
2
72%
05:49
20:11
03:00 h
Waxing Crescent
W @
3
60%
05:48
20:12
01:35 h
Waxing Crescent
W @
4
44%
05:47
20:14
09:35 h
First Quarter
W @
5
62%
05:45
20:15
02:50 h
Waxing Gibbous
W @
6
80%
05:44
20:16
00:40 h
Waxing Gibbous
W @
7
78%
05:42
20:17
02:15 h
Waxing Gibbous
W @
8
64%
05:41
20:18
00:10 h
Waxing Gibbous
W @
9
68%
05:40
20:20
00:40 h
Waxing Gibbous
W @
10
54%
05:38
20:21
10:30 h
Waxing Gibbous
W @
11
38%
05:37
20:22
14:05 h
Full
E @
12
38%
05:36
20:23
12:25 h
Waning Gibbous
E @
13
46%
05:35
20:25
13:10 h
Waning Gibbous
E @
14
64%
05:33
20:26
04:50 h
Waning Gibbous
W @
15
76%
05:32
20:27
00:10 h
Waning Gibbous
E @
16
66%
05:31
20:28
10:25 h
Waning Gibbous
W @
17
80%
05:30
20:29
00:10 h
Waning Gibbous
E @
18
84%
05:29
20:30
00:35 h
Waning Gibbous
E @
19
70%
05:28
20:31
00:00 h
Last Quarter
W @
20
n/a%
05:27
20:32
n/a h
Waning Crescent
n/a @
21
n/a%
05:26
20:34
n/a h
Waning Crescent
n/a @
22
n/a%
05:25
20:35
n/a h
Waning Crescent
n/a @
23
n/a%
05:24
20:36
n/a h
Waning Crescent
n/a @
24
n/a%
05:23
20:37
n/a h
Waning Crescent
n/a @
25
n/a%
05:23
20:38
n/a h
Waning Crescent
n/a @
26
n/a%
05:22
20:39
n/a h
New
n/a @
27
n/a%
05:21
20:40
n/a h
Waxing Crescent
n/a @
28
n/a%
05:20
20:41
n/a h
Waxing Crescent
n/a @
29
n/a%
05:20
20:42
n/a h
Waxing Crescent
n/a @
30
n/a%
05:19
20:43
n/a h
Waxing Crescent
n/a @
31
n/a%
05:18
20:43
n/a h
Waxing Crescent
n/a @
May
63%
92 h
SSW @
Normals
56%
6.7°C
1015.8 mb
91 h
W @ 1 km/h
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