STATISTICS from CTO Weather Centre - December, 2025
MONTHLY SUMMARY: MEANS AND TOTALS:
Reading
Mean
Normal
RecHi
YY
RecLo
YY
High Temp
2015
2007
Low Temp
2015
2007
Mean Temp
2015
2007
Dew Point
2015
2013
Relative Humidity
75
%
63
%
78
%
2018
23
%
2013
Barometric Pressure
2023
2016
Winds
2023
2001
- from
S
E
WNW
N
Total Reading
Total
Normal
RecMost
YY
RecLeast
YY
Rain
2020
2016
Snow
2022
2022
- Water Equivalent
2022
2020
Precipitation
2022
2016
Sunshine
30
h
105
h
199
h
2016
0
h
2001
MONTHLY SUMMARY: SINGLE-DAY EXTREMES AND RECORDS:
Reading
Highest
DD
Lowest
DD
RecHi
YY-DD
RecLo
YY-DD
High Temp
03
08
2019-23
2004-20
Low Temp
06
09
2015-11
2004-20
Humidex
09
2019-23
Wind Chill
08
2017-28
Dew Point
03
04
2019-23
2020-21
Relative Humidity
92
%
03
39
%
04
100
%
2022-30
0
%
2020-21
Barometric Pressure
01
09
2022-14
2022-23
Winds
06
2015-24
- from
SSW
S
Daily Total
Most
DD
RecMost
YY-DD
Rain
08
2020-25
Snow
08
2015-29
- Water Equivalent
08
2015-29
Precipitation
08
2020-25
Sunshine
08:00
h
08
15:55
h
2016-15
Daily Mean
Highest
DD
Lowest
DD
RecHi
YY-DD
RecLo
YY-DD
Temperature
06
08
2015-24
2004-20
Dew Point
03
05
2019-23
2020-21
Relative Humidity
86
%
03
64
%
04
100
%
2022-31
20
%
2013-01
Barometric Pressure
08
06
2022-14
2022-24
Winds
06
05
2022-23
2001-01
- from
W
W
WNW
N
EVENTS THIS MONTH (11):
Full Moon - December 4 @ 08:14
The Moon is most-opposite the Sun in the sky, rising as the sun sets.
Pearl Harbour - December 7 @ 00:00
On this day in 1941, Japan achieved complete surprise in its attack on Pearl Harbour, sinking most of the US Pacific Fleet stationed at Hawaii. Fortunately, the four American aircraft carriers were out to sea on that Sunday morning, and survived to wreak havoc on the Japanese in later battles. The United States declared war the following day, eventually winning the Pacific War in 1945.
Last Quarter - December 10 @ 22:51
A waning half-Moon is near the meridian (halfway across the sky) as the Sun rises.
New Moon - December 19 @ 10:43
The Moon is nearest the Sun in the sky and cannot be seen from the ground.
Happy Festivus! - December 23 @ 00:00
Festivus, the Festival for, as the saying goes, the rest of us.
Sir Isaac Newton Born - December 25 @ 00:00
On this day in 1642, Sir Isaac Newton was born. He went on to give birth to modern physics and new branches of mathematics.
Xmas Day Ice Storm - December 25 @ 00:00
The Ottawa area was hit by a massive ice storm on this day in 1986.
Launch of the JWST - December 25 @ 00:00
On Xmas Day in 2021, the James Webb Space Telescope was launched aboard an ArianeSpace Ariane 5 launch vehicle. Orbiting Earth-Sun Lagrange Point L2, and sporting vastly superior optics and electronics to Hubble's, the JWST has made revolutionary discoveries, including the existence of well-formed galaxies shortly after the Big Bang.
Indian Ocean Earthquake and Tsunami - December 26 @ 00:00
A megathrust earthquake off Sumatra, Indonesia, caused a massive tsunami throughout the Indian Ocean, on this day in 2004. In Indonesia, the hardest-hit by the giant ocean waves, up to 225,000 people died.
First Quarter - December 27 @ 04:09
A waxing half-Moon is near the meridian (halfway across the sky) as the Sun sets.
Winter Solstice - December 21 @ 00:03
Autumn ends; Winter begins (N. Hemisphere). Spring ends; Summer begins (S. Hemisphere). Shortest day of the year (N. Hemisphere). Longest day of the year (S. Hemisphere)
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
72%
07:23
16:21
04:45 h
Waxing Gibbous
W @
2
78%
07:24
16:21
05:40 h
Waxing Gibbous
E @
3
86%
07:25
16:21
00:55 h
Waxing Gibbous
W @
4
64%
07:26
16:20
05:55 h
Full
W @
5
69%
07:27
16:20
01:10 h
Waning Gibbous
W @
6
78%
07:28
16:20
00:30 h
Waning Gibbous
W @
7
79%
07:29
16:20
00:30 h
Waning Gibbous
W @
8
72%
07:30
16:20
08:00 h
Waning Gibbous
W @
9
81%
07:31
16:20
02:20 h
Waning Gibbous
W @
10
89%
07:32
16:20
00:15 h
Waning Gibbous
E @
11
n/a%
07:33
16:20
n/a h
Waning Gibbous
n/a @
12
n/a%
07:34
16:20
n/a h
Last Quarter
n/a @
13
n/a%
07:34
16:20
n/a h
Waning Crescent
n/a @
14
n/a%
07:35
16:20
n/a h
Waning Crescent
n/a @
15
n/a%
07:36
16:20
n/a h
Waning Crescent
n/a @
16
n/a%
07:37
16:21
n/a h
Waning Crescent
n/a @
17
n/a%
07:37
16:21
n/a h
Waning Crescent
n/a @
18
n/a%
07:38
16:21
n/a h
Waning Crescent
n/a @
19
n/a%
07:39
16:22
n/a h
New
n/a @
20
n/a%
07:39
16:22
n/a h
Waxing Crescent
n/a @
21
n/a%
07:40
16:23
n/a h
Waxing Crescent
n/a @
22
n/a%
07:40
16:23
n/a h
Waxing Crescent
n/a @
23
n/a%
07:41
16:24
n/a h
Waxing Crescent
n/a @
24
n/a%
07:41
16:24
n/a h
Waxing Crescent
n/a @
25
n/a%
07:41
16:25
n/a h
Waxing Crescent
n/a @
26
n/a%
07:42
16:26
n/a h
First Quarter
n/a @
27
n/a%
07:42
16:26
n/a h
Waxing Gibbous
n/a @
28
n/a%
07:42
16:27
n/a h
Waxing Gibbous
n/a @
29
n/a%
07:42
16:28
n/a h
Waxing Gibbous
n/a @
30
n/a%
07:43
16:29
n/a h
Waxing Gibbous
n/a @
31
n/a%
07:43
16:30
n/a h
Waxing Gibbous
n/a @
December
75%
30 h
S @
Normals
63%
-9.7°C
1016.4 mb
105 h
E @ 1 km/h
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