The autumnal equinox occurred last night at 10:29pm EST marking summer's end and Fall's arrival. This was when the geometric center of the Sun's disc crossed the same horizontal plane at the Earth's equator on its way south as the Earth orbited the sun. Generally, daytime and night time are around 12 hrs each but not exact. Here in Indianapolis, the length of dark over night last night was 11 hrs 51 mins while the length of daytime for the 1st FULL day of fall is 12 hrs 7 mins. Though autumn officially just began, meteorological fall began on the 1st day of this month. Meteorological Fall begins on a different day because its based off of the annual temperature cycle, 3 months for each season. Meteorological Fall runs from September 1st and ends on November 30th. We see the biggest cool down during this season. The normal high temperature declines from 83 on September 1st to 45 on November 30th, while the normal low temperature declines from 62 to 29. This is a 33° to 38° drop in temps between the highs and lows. The daily average temperature declines 35° from 72° on September 1st to 37° on November 30. The daily average temperature is a combination of the each days high and low temperature.
MONTHLY CLIMATE AVERAGES (1981-2010) IN INDIANAPOLIS, INDIANA DURING THE FALL SEASON
| MONTH |
AVG HIGH |
AVG LOW |
AVG TEMP |
WARMEST |
COOLEST |
AVG PRECIP |
WETTEST |
DRIEST |
AVG SNOW |
SNOWIEST |
| SEP |
7.7° |
56.2° |
66.9° |
73.2°
in 1925
& 1933 |
59.8°
in 1918 |
3.12" |
10.37"
2003 |
0.24"
1963 |
0.0" |
Trace
1951 |
| OCT |
65.3° |
44.7° |
55.0° |
63.4°
in 1900 |
46.6°
in 1925 |
3.12" |
8.98"
in 1919 |
0.17"
in 1963 |
0.4" |
9.3"
1989 |
| NOV |
52.2° |
35.1° |
43.6° |
51.7°
in 1931 |
31.1°
in 1880 |
3.70" |
9.35"
in 1881 |
0.11"
in 1904 |
0.7" |
9.8"
in 1932 |
| FALL |
65.1 |
45.3 |
55.2 |
61.3°
in 1931 |
48.9°
in 1976 |
9.94" |
18.71"
in 1881 |
2.59"
in 1963 |
1.1" |
9.9"
in 1989 |
| NOTE: There are many years on record where measurable snow was not recorded individually during the months September, October, November, and as a season in whole. |
As the angle of the sun continues to get lower, the length of night time expands while daylight steadily shortens. The loss of daylight hours and lower angle of the sun means it takes longer for temperatures to warm up, therefore, the average temperature continues to decline. We've already seen some our coolest temperature since Spring and we'll only continue to see even cooler weather in the weeks and months to come. Here's a list of a few "Chilly" facts.
- Last day w/ a high temp in the 50s: May 17, 2014 (55°)
- Last day w/ a high temp in the 40s: April 7, 2014 (49°)
- Last day w/ a high temp in the 30s: April 15, 2014 (38°)
- Last day w/ a high temp in the 20s: March 2, 2014 (25°)
- Last day w/ a high temp in the teens: March 3, 2014 (18°)
- Last day w/ a high temp in the single digits: January 23, 2014 (9°)
- Last subzero high: January 18, 1994 (-4°)
- Last low temp in the 30s: May 18, 2014 (38°)
- Last low temp in the 20s: April 16, 2014 (26°)
- Last low temp in the teens: March 26, 2014 (15°)
- Last low temp in the single digits : March 4, 2014 (7°)
- Last subzero low: February 11, 2014 (-6°)
- Last Freeze Date: April 16, 2014 (26°)
- Last Hard Freeze: April 16, 2014 (26°)
- Last day w/ measurable snow: April 15, 2014 (0.2”)
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The last Fall season saw just about everything. It began with the 36th Warmest September and actively went to the 12th Wettest October and chilled into the 23rd Coolest November. You can read more in my blog
HERE or you can also read an archived story from the
US NATIONAL WEATHER SERVICE INDIANAPOLIS, IN by clicking
HERE. Here are some of the highlights from the last fall season.
***10 DAY WEATHER OUTLOOK***
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