Monthly Climate Summary

September 2021 Summary

Mostly Cloudy 32°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

64.0°F

Normal: 63.6°F
Departure: + 0.4°F

Total Precipitation

5.98 in

Normal: 3.73 in
Departure: + 2.25 in

Total Snowfall

0.0 in

Normal: 0.0 in
Departure: + 0.0 in

Warmest Day

83°F

September 15th

Coldest Day

41°F

September 29th

Wettest Day

1.57 in

September 24th

Snowiest Day

0.0 in

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September 2021 Daily Summary
Day Weather High Temperature Low Temperature Precipitation Snowfall
1st Rain 67°F 57°F 1.43 in 0.0 in
2nd Rain 69°F 54°F 0.21 in 0.0 in
3rd Mostly Cloudy 70°F 54°F 0.00 in 0.0 in
4th Partly Cloudy 75°F 53°F 0.00 in 0.0 in
5th Rain Shower 69°F 59°F 0.09 in 0.0 in
6th Rain Shower 77°F 57°F 0.01 in 0.0 in
7th Partly Cloudy 74°F 54°F 0.00 in 0.0 in
8th Thunderstorm 81°F 60°F 0.50 in 0.0 in
9th Rain Shower 70°F 62°F 0.25 in 0.0 in
10th Partly Cloudy 70°F 54°F 0.00 in 0.0 in
11th Partly Cloudy 76°F 50°F 0.00 in 0.0 in
12th Overcast 77°F 58°F 0.06 in 0.0 in
13th Rain Shower 73°F 58°F 0.52 in 0.0 in
14th Mostly Cloudy 73°F 53°F 0.00 in 0.0 in
15th Thunderstorm 83°F 65°F 0.45 in 0.0 in
16th Rain Shower 74°F 58°F 0.19 in 0.0 in
17th Mostly Cloudy 75°F 65°F 0.00 in 0.0 in
18th Mostly Cloudy 82°F 62°F 0.00 in 0.0 in
19th Sunny 71°F 53°F 0.00 in 0.0 in
20th Sunny 75°F 47°F 0.00 in 0.0 in
21st Partly Cloudy 73°F 54°F 0.00 in 0.0 in
22nd Rain Shower 80°F 62°F 0.03 in 0.0 in
23rd Rain 80°F 67°F 0.63 in 0.0 in
24th Rain 72°F 53°F 1.57 in 0.0 in
25th Partly Cloudy 72°F 48°F 0.00 in 0.0 in
26th Partly Cloudy 68°F 51°F 0.00 in 0.0 in
27th Rain Shower 70°F 49°F 0.01 in 0.0 in
28th Mostly Cloudy 65°F 55°F 0.00 in 0.0 in
29th Mostly Cloudy 62°F 41°F 0.00 in 0.0 in
30th Rain Shower 58°F 47°F 0.03 in 0.0 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

77.5

Normal: 66.0
Departure: + 11.5

Cooling Degree Days

48.0

Normal: 23.0
Departure: + 25.0

Climate Activity Summary

Key temperature and precipitation patterns for the month

Days at or
Above 90°F

0

Days Above Freezing

30

Days That Stayed Below Freezing

0

Freezing Nights (Low Below 32°F)

0

Days with Precipitation

15

Days with
Snowfall

0

Wind Summary

Monthly wind averages, peak gusts, and dominant direction

Average Wind Speed

0.9 mph

Peak Wind Gust

18 mph

Dominant Wind Direction

ESE

All-time Monthly Records

Highest and lowest observed extremes for this month

Warmest Day

100°F

September 2nd, 1953

Coldest Day

24°F

September 27th, 1947

Wettest Day

5.60 in

September 16th, 1999

Snowiest Day

0.0 in

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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.