STATISTICS from CTO Weather Centre - May, 2026
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
56
%
56
%
68
%
2024
44
%
2023
Barometric Pressure
2023
2017
Winds
2023
2002
- from
N
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
52
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
05
02
2020-27
2002-14
Low Temp
06
01
2020-27
2020-09
Humidex
05
2020-27
Wind Chill
n/a
2021-01
Dew Point
05
03
2015-05
2019-01
Relative Humidity
91
%
10
21
%
03
99
%
2013-23
1
%
2017-01
Barometric Pressure
12
05
2023-26
2023-01
Winds
04
2022-21
- from
S
W
Daily Total
Most
DD
RecMost
YY-DD
Rain
04
2023-01
Snow
01
2002-01
- Water Equivalent
01
2002-01
Precipitation
04
2023-01
Sunshine
09:30
h
09
22:00
h
2020-20
Daily Mean
Highest
DD
Lowest
DD
RecHi
YY-DD
RecLo
YY-DD
Temperature
05
02
2020-27
2002-14
Dew Point
05
03
2024-22
2017-01
Relative Humidity
68
%
10
42
%
03
87
%
2015-11
1
%
2017-01
Barometric Pressure
11
04
2023-26
2023-01
Winds
09
02
2023-01
2002-01
- from
ENE
W
NNW
N
EVENTS THIS MONTH (13):
Full Moon - May 1 @ 13:23
The Moon is most-opposite the Sun in the sky, rising as the sun sets.
Star Wars Day - May 4 @ 01:00
May the fourth...
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.
Last Quarter - May 9 @ 17:10
A waning half-Moon is near the meridian (halfway across the sky) as the Sun rises.
Manitoba and NWT Join Confederation - May 12 @ 01:00
Today marks 156 years since Manitoba and the North West Territories joined the Canadian Confederation in 1870.
New Moon - May 16 @ 16:01
The Moon is nearest the Sun in the sky and cannot be seen from the ground.
Eruption of Mt. St. Helens - May 18 @ 01:00
On this day in 1980 (now 46 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.
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.
First Quarter - May 23 @ 07:10
A waxing half-Moon is near the meridian (halfway across the sky) as the Sun sets.
Barrie Tornado - May 31 @ 01:00
Today marks 41 years since a major tornado ripped through the city of Barrie, Ontario, in 1985, causing 8 deaths and $150-million in damage.
Full Moon - May 31 @ 04:45
The Moon is most-opposite the Sun in the sky, rising as the sun sets.
Victoria Day - May 18 @ 01:00
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).
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
54%
05:51
20:10
07:45 h
Full
W @
2
58%
05:49
20:11
01:00 h
Waning Gibbous
W @
3
42%
05:48
20:12
08:55 h
Waning Gibbous
W @
4
64%
05:47
20:14
02:40 h
Waning Gibbous
E @
5
59%
05:45
20:15
03:10 h
Waning Gibbous
ENE @
6
57%
05:44
20:16
00:40 h
Waning Gibbous
W @
7
50%
05:42
20:17
04:40 h
Waning Gibbous
E @
8
46%
05:41
20:18
02:55 h
Waning Gibbous
NW @
9
56%
05:40
20:20
09:30 h
Last Quarter
ENE @
10
68%
05:38
20:21
04:40 h
Waning Crescent
WNW @
11
60%
05:37
20:22
06:25 h
Waning Crescent
E @
12
47%
05:36
20:23
04:15 h
Waning Crescent
W @
13
n/a%
05:35
20:25
n/a h
Waning Crescent
n/a @
14
n/a%
05:33
20:26
n/a h
Waning Crescent
n/a @
15
n/a%
05:32
20:27
n/a h
Waning Crescent
n/a @
16
n/a%
05:31
20:28
n/a h
New
n/a @
17
n/a%
05:30
20:29
n/a h
Waxing Crescent
n/a @
18
n/a%
05:29
20:30
n/a h
Waxing Crescent
n/a @
19
n/a%
05:28
20:31
n/a h
Waxing Crescent
n/a @
20
n/a%
05:27
20:32
n/a h
Waxing Crescent
n/a @
21
n/a%
05:26
20:34
n/a h
Waxing Crescent
n/a @
22
n/a%
05:25
20:35
n/a h
Waxing Crescent
n/a @
23
n/a%
05:24
20:36
n/a h
First Quarter
n/a @
24
n/a%
05:23
20:37
n/a h
Waxing Gibbous
n/a @
25
n/a%
05:23
20:38
n/a h
Waxing Gibbous
n/a @
26
n/a%
05:22
20:39
n/a h
Waxing Gibbous
n/a @
27
n/a%
05:21
20:40
n/a h
Waxing Gibbous
n/a @
28
n/a%
05:20
20:41
n/a h
Waxing Gibbous
n/a @
29
n/a%
05:20
20:42
n/a h
Waxing Gibbous
n/a @
30
n/a%
05:19
20:43
n/a h
Full
n/a @
31
n/a%
05:18
20:43
n/a h
Waning Gibbous
n/a @
May
56%
52 h
N @
Normals
56%
6.7°C
1015.8 mb
91 h
W @ 1 km/h
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