Monthly Climate Summary

December 2009 Summary

Light Snow 34°F

Data is available from 2005 to present. The latest summary is available the first week of each month.

Monthly Climate Summary

Observed averages, totals, and departures from normal

Average Temperature

26.0°F

Normal: 30.5°F
Departure: -4.5°F

Total Precipitation

3.71 in

Normal: 3.26 in
Departure: + 0.45 in

Total Snowfall

14.7 in

Normal: 13.3 in
Departure: + 1.4 in

Warmest Day

60°F

December 3rd

Coldest Day

0°F

December 18th

Wettest Day

0.99 in

December 9th

Snowiest Day

8.2 in

December 9th

December 2009 Daily Summary
Day Weather High Temperature Low Temperature Precipitation Snowfall
1st Snow Shower 38°F 23°F 0.00 in 0.0 in
2nd Rain Shower 47°F 27°F 0.15 in 0.0 in
3rd Rain 60°F 43°F 0.77 in 0.0 in
4th Partly Cloudy 46°F 31°F 0.13 in 0.0 in
5th Snow 36°F 29°F 0.26 in 3.5 in
6th Snow Shower 32°F 20°F 0.00 in 0.0 in
7th Overcast 31°F 19°F 0.00 in 0.0 in
8th Snow Shower 36°F 24°F 0.01 in 0.1 in
9th Snow 36°F 25°F 0.99 in 8.2 in
10th Snow Flurries 36°F 22°F 0.00 in 0.0 in
11th Mostly Sunny 25°F 16°F 0.00 in 0.0 in
12th Partly Cloudy 31°F 9°F 0.00 in 0.0 in
13th Wintry Mix 36°F 6°F 0.26 in 0.2 in
14th Mostly Cloudy 41°F 31°F 0.00 in 0.0 in
15th Snow Shower 41°F 31°F 0.02 in 0.0 in
16th Snow Shower 31°F 20°F 0.00 in 0.0 in
17th Sunny 20°F 6°F 0.00 in 0.0 in
18th Mostly Sunny 17°F 0°F 0.00 in 0.0 in
19th Overcast 20°F 5°F 0.00 in 0.0 in
20th Mostly Cloudy 25°F 18°F 0.00 in 0.0 in
21st Mostly Sunny 28°F 17°F 0.00 in 0.0 in
22nd Mostly Sunny 22°F 13°F 0.00 in 0.0 in
23rd Snow Shower 18°F 13°F 0.02 in 1.0 in
24th Mostly Cloudy 29°F 19°F 0.00 in 0.0 in
25th Overcast 27°F 24°F 0.00 in 0.0 in
26th Wintry Mix 39°F 26°F 0.33 in 0.8 in
27th Rain Shower 44°F 28°F 0.68 in 0.0 in
28th Snow Shower 35°F 26°F 0.00 in 0.0 in
29th Snow Shower 28°F 6°F 0.00 in 0.0 in
30th Mostly Cloudy 25°F 9°F 0.00 in 0.0 in
31st Light Snow 28°F 21°F 0.09 in 0.9 in
Legend and Icon Key
Warmest High
Coldest Low
Wettest Day
Snowiest Day
Sunny Mostly Sunny Partly Cloudy Mostly Cloudy Overcast Rain Light Rain Rain Shower Drizzle Freezing Rain Snow Light Snow Snow Shower Snow Flurries Sleet Rain & Snow Wintry Mix Thunderstorm Haze

Degree Day Summary

Heating and cooling degree days (base 65°F)

Heating Degree Days

1,207.5

Normal: 1,069.0
Departure: + 138.5

Cooling Degree Days

0.0

Normal: 0.0
Departure: + 0.0

Climate Activity Summary

Key temperature and precipitation patterns for the month

Days at or
Above 90°F

0

Days Above Freezing

14

Days That Stayed Below Freezing

17

Freezing Nights (Low Below 32°F)

30

Days with Precipitation

12

Days with
Snowfall

7

Wind Summary

Monthly wind averages, peak gusts, and dominant direction

Average Wind Speed

2.7 mph

Peak Wind Gust

36 mph

Dominant Wind Direction

SSE

All-time Monthly Records

Highest and lowest observed extremes for this month

Warmest Day

72°F

December 24th, 2015

Coldest Day

-22°F

December 25th, 1969

Wettest Day

3.16 in

December 11th, 1952

Snowiest Day

19.7 in

December 17th, 2020

Climate Context

How this month compares to typical conditions

Monthly climate summaries compare observed weather to long‑term normals. Positive temperature departures indicate warmer‑than‑normal conditions, while negative departures reflect cooler‑than‑normal patterns. Precipitation and snowfall departures help highlight unusually wet, dry, or snowy months across Colonie.