Upper Darby has chilly winters and warm summers. A typical July afternoon reaches 87°, a January night drops to 26°, and about 23 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normalsUpdated once a decade
☀️
July high
87°
41st hottest of 3,547 Pennsylvania towns
❄️
January low
26°
24th mildest of 3,547 Pennsylvania towns
💧
Rain + melted snow
47 in
1047th wettest of 3,547 Pennsylvania towns
🌨️
Snow a winter
23 in
562nd least snowy of 3,541 Pennsylvania towns
A normal year
What a year in Upper Darby feels like
❄️
Winter
44° / 28°
Typical high / low · 5 days with an inch or more of snow
🌷
Spring
64° / 43°
Typical high / low · Last frost around Apr 2
☀️
Summer
85° / 66°
Typical high / low · 30 days reach 90° in a normal year
🍂
Fall
67° / 48°
Typical high / low · First frost around Nov 10
10°
20°
40°
50°
60°
70°
80°
90°
100°
32°
41°
26°
44°
27°
52°
34°
65°
43°
74°
53°
83°
63°
87°
68°
85°
66°
79°
59°
67°
48°
56°
38°
46°
31°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
32°, freezingBar runs from the typical overnight low up to the afternoon high
Best months to be outsideAprMayJunSepOctHighs of 62–84° and lows of 40° or more
Month by month
Upper Darby weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
Month
High
Low
Rain + melt
Snow
Wet days
Snow on ground
30-yr range
January
41°
26°
3.3"
7.1"
11
5
25° – 41°
February
44°
27°
2.8"
8.4"
10
6
24° – 43°
March
52°
34°
4.1"
3.6"
11
2
38° – 51°
April
65°
43°
3.7"
0.3"
11
0
50° – 59°
May
74°
53°
3.6"
0
11
0
59° – 69°
June
83°
63°
4.3"
0
10
0
69° – 77°
July
87°
68°
4.7"
0
10
0
73° – 81°
August
85°
66°
4.4"
0
9
0
71° – 80°
September
79°
59°
4.6"
0
9
0
65° – 73°
October
67°
48°
3.8"
0
9
0
53° – 64°
November
56°
38°
3.2"
0.2"
9
0
41° – 52°
December
46°
31°
4.1"
3.5"
11
3
30° – 50°
Year
65°
46°
46.6"
23.1"
121
16
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain & snow
Rain and snow in Upper Darby
Upper Darby gets 47 inches of rain and melted snow a year. July is the wettest month and February the driest. Rain or snow falls on about 121 days a year. Snow covers the ground about 16 days of the year.
💧
47 in
Rain + melted snow a year
More rain than 76% of U.S. towns
❄️
23 in
Snow in a normal winter
Less snow than 53% of U.S. towns
⛄
16 days
With 1"+ of snow on the ground
Fewer than 63% of U.S. towns
Rain + melted snow by month
Inches of water
4.7"
JFMAMJJASOND
Snowfall by month
Inches of snow
8.4"
JFMAMJJASOND
Frost & the growing season
About 224 frost-free days a year
In half of years the last 32° night comes by April 2 and the first one by November 10. That leaves about 224 frost-free days for gardens, longer than 84% of U.S. towns.
🌱 Apr 2
🍂 Nov 10
224 frost-free days
JFMAMJJASOND
🥶
77
nights at or below 32° in a normal year
🧊
0
nights below 0° in a normal year
🔥
30
days that reach 90° in a normal year
Freezing nights by month
Average nights at or below 32°
JFMAMJJASOND
90° days by month
Average days at 90° or more
JFMAMJJASOND
Heating & cooling
Heating and cooling a home in Upper Darby
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Upper Darby, 77% of that work is heating and 23% is cooling.
🔥
4,510 heating degree daysLess heating than 74% of U.S. towns
❄️
1,358 cooling degree daysMore cooling than 74% of U.S. towns
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Around Upper Darby
Upper Darby and its neighbors
Upper Darby borders 11 towns with climate data. January nights across them vary by 1.5°. Haverford has the coldest January nights (25°) and Darby the hottest July afternoons (88°). Upper Darby’s January low is 26° and its July high 87°.
Compared with every U.S. town and city on TownTapestry, each counted once.
Then and now
Warmer than it used to be
+2.0°1991–2020 average vs. the 20th century (1901–2000)
The last 30 years in Upper Darby averaged 2.0° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 94% of U.S. towns.
❄️ Winter+2.9°now 36°, was 33°
🌷 Spring+1.7°now 53°, was 52°
☀️ Summer+1.8°now 75°, was 74°
🍂 Fall+1.7°now 58°, was 56°
Change by month1991–2020 average minus 1901–2000 average, at Upper Darby’s spot on NOAA’s grid
+1.2°
+3.6°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Year to year
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 30° to 50°. June is the most reliable, staying within 8°.
10°
20°
30°
40°
50°
60°
70°
80°
90°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Coldest to warmest month in 30 yearsNormal
Questions
Common questions about Upper Darby’s climate
What is the coldest month in Upper Darby?
January, with a typical high of 41° and a low of 26°.
What is the hottest month in Upper Darby?
July, with a typical high of 87° and a low of 68°. About 30 days a year reach 90°.
How much snow does Upper Darby get?
About 23 inches in a normal winter, most of it in February.
When is the first frost in Upper Darby?
In half of years the first 32° night comes by November 10, and the last spring frost by April 2.
What is the rainiest month in Upper Darby?
July, with 4.7 inches of rain and melted snow. The year totals 47 inches.
📍Temperatures and rainfall come from NOAA’s gridded climate normals for Upper Darby itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Philadelphia Intl Airport, PA (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.