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
77
%
63
%
78
%
2018
23
%
2013
Barometric Pressure
2023
2025
Winds
2023
2001
- from
SSW
E
WNW
N
Monthly Total
Total
Normal
RecMost
YY
RecLeast
YY
Rain
2020
2016
Snow
2022
2022
- Water Equivalent
2022
2020
Precipitation
2022
2016
Sunshine
80
h
105
h
199
h
2016
0
h
2001
MONTHLY SUMMARY: SINGLE-DAY EXTREMES AND RECORDS:
Reading
Max
DD
Min
DD
RecHi
YY-DD
RecLo
YY-DD
High Temp
27
26
2019-23
2004-20
Low Temp
17
30
2015-11
2004-20
Humidex
31
2019-23
Wind Chill
30
2017-28
Dew Point
27
04
2019-23
2020-21
Relative Humidity
99
%
19
39
%
04
100
%
2022-30
0
%
2020-21
Barometric Pressure
22
29
2022-14
2022-23
Winds
19
2015-24
- from
SSE
S
Daily Total
Most
DD
RecMost
YY-DD
Rain
19
2020-25
Snow
25
2015-29
- Water Equivalent
25
2015-29
Precipitation
12
2020-25
Sunshine
08:40
14
15:55
2016-15
Daily Mean
Max
DD
Min
DD
RecHi
YY-DD
RecLo
YY-DD
Temperature
27
26
2015-24
2004-20
Dew Point
27
26
2019-23
2020-21
Relative Humidity
90
%
10
64
%
04
100
%
2022-31
20
%
2013-01
Barometric Pressure
22
29
2022-14
2022-24
Winds
19
11
2022-23
2001-01
- from
NW
N
WNW
N
EVENTS LAST MONTH (11):
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)
First Quarter - December 27 @ 04:09
A waxing half-Moon is near the meridian (halfway across the sky) as the Sun sets.
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.
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.
Xmas Day Ice Storm - December 25 @ 00:00
The Ottawa area was hit by a massive ice storm on this day in 1986.
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.
Happy Festivus! - December 23 @ 00:00
Festivus, the Festival for, as the saying goes, the rest of us.
New Moon - December 19 @ 10:43
The Moon is nearest the Sun in the sky and cannot be seen from the ground.
Last Quarter - December 10 @ 22:51
A waning half-Moon is near the meridian (halfway across the sky) as the Sun rises.
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.
Full Moon - December 4 @ 08:14
The Moon is most-opposite the Sun in the sky, rising as the sun sets.
Daily Temperatures Last Month:
Precipitation Last Month:
Daily Readings, Last Month:
Day
High
Low
Mean
MxHx
MnWC
AvRH
AvDP
AvBP
Precip
Sunrise
Sunset
Sun
Moon
Winds
1
72%
07:23
16:21
04:45
Waxing Gibbous
W @
2
78%
07:24
16:21
05:40
Waxing Gibbous
E @
3
86%
07:25
16:21
00:55
Waxing Gibbous
W @
4
64%
07:26
16:20
05:55
Full
W @
5
69%
07:27
16:20
01:10
Waning Gibbous
W @
6
78%
07:28
16:20
00:30
Waning Gibbous
W @
7
79%
07:29
16:20
00:30
Waning Gibbous
W @
8
72%
07:30
16:20
08:00
Waning Gibbous
W @
9
81%
07:31
16:20
02:20
Waning Gibbous
W @
10
90%
07:32
16:20
00:15
Waning Gibbous
E @
11
83%
07:33
16:20
01:25
Waning Gibbous
N @
12
78%
07:34
16:20
07:50
Last Quarter
N @
13
84%
07:34
16:20
00:20
Waning Crescent
N @
14
68%
07:35
16:20
08:40
Waning Crescent
W @
15
74%
07:36
16:20
01:00
Waning Crescent
W @
16
74%
07:37
16:21
01:45
Waning Crescent
E @
17
85%
07:37
16:21
00:20
Waning Crescent
WNW @
18
72%
07:38
16:21
00:30
Waning Crescent
E @
19
82%
07:39
16:22
00:25
New
NW @
20
76%
07:39
16:22
01:50
Waxing Crescent
WNW @
21
73%
07:40
16:23
02:15
Waxing Crescent
E @
22
80%
07:40
16:23
01:05
Waxing Crescent
W @
23
88%
07:41
16:24
00:40
Waxing Crescent
E @
24
82%
07:41
16:24
02:25
Waxing Crescent
E @
25
75%
07:41
16:25
05:40
Waxing Crescent
W @
26
72%
07:42
16:26
00:50
First Quarter
W @
27
73%
07:42
16:26
04:00
Waxing Gibbous
W @
28
74%
07:42
16:27
02:45
Waxing Gibbous
W @
29
82%
07:42
16:28
00:40
Waxing Gibbous
WNW @
30
72%
07:43
16:29
05:05
Waxing Gibbous
ENE @
31
72%
07:43
16:30
01:35
Waxing Gibbous
E @
December
77%
80h
SSW @
Normals
63%
-9.7°C
1016.4 mb
105 h
E @ 1 km/h
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