Pomona has warm winters and warm summers, with very little rain. A typical July afternoon reaches 90°, a January night drops to 44°, and snow is almost unheard of.
NOAA 1991-2020 climate normalsUpdated once a decade
☀️
July high
90°
784th hottest of 1,618 California towns
❄️
January low
44°
309th mildest of 1,618 California towns
💧
Rain + melted snow
18 in
808th driest of 1,618 California towns
🌨️
Snow a winter
0.0 in
470th snowiest of 1,499 California towns
A normal year
What a year in Pomona feels like
❄️
Winter
68° / 44°
Typical high / low · Snow is rare
🌷
Spring
75° / 50°
Typical high / low · Frost is rare by spring
☀️
Summer
89° / 61°
Typical high / low · 71 days reach 90° in a normal year
🍂
Fall
82° / 54°
Typical high / low · Mild well into the fall
40°
50°
60°
70°
80°
90°
100°
32°
68°
44°
68°
45°
71°
47°
75°
49°
78°
54°
84°
58°
90°
62°
92°
63°
89°
61°
82°
55°
74°
48°
67°
43°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
32°, freezingBar runs from the typical overnight low up to the afternoon high
Best months to be outsideJanFebMarAprMayOctNovDecHighs of 62–84° and lows of 40° or more
Month by month
Pomona 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
68°
44°
4.1"
0
5
0
52° – 62°
February
68°
45°
4.6"
0
6
0
50° – 67°
March
71°
47°
2.7"
0
4
0
53° – 66°
April
75°
49°
1.0"
0
2
0
56° – 66°
May
78°
54°
0.5"
0
1
0
60° – 72°
June
84°
58°
0.1"
0
0
0
66° – 76°
July
90°
62°
0.0"
0
0
0
72° – 82°
August
92°
63°
0.0"
0
0
0
74° – 82°
September
89°
61°
0.1"
0
0
0
71° – 79°
October
82°
55°
0.7"
0
3
0
64° – 73°
November
74°
48°
1.2"
0
3
0
53° – 65°
December
67°
43°
2.8"
0
5
0
51° – 61°
Year
78°
52°
17.9"
0.0"
31
0
“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 Pomona
Pomona gets 18 inches of rain and melted snow a year. February is the wettest month and August the driest. Rain or snow falls on about 31 days a year.
💧
18 in
Rain + melted snow a year
Less rain than 91% of U.S. towns
❄️
0.0 in
Snow in a normal winter
Less snow than 96% of U.S. towns
⛄
0 days
With 1"+ of snow on the ground
Fewer than 94% of U.S. towns
Rain + melted snow by month
Inches of water
4.6"
JFMAMJJASOND
Snowfall by month
No measurable snow in a normal year.
Frost & the growing season
A year-round growing season
🌿 Only about most winters dip to 32° here (65% of years), so gardens can grow year-round.
🥶
3
nights at or below 32° in a normal year
🧊
0
nights below 0° in a normal year
🔥
71
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 Pomona
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Pomona, 49% of that work is heating and 51% is cooling.
🔥
1,457 heating degree daysLess heating than 95% of U.S. towns
❄️
1,495 cooling degree daysMore cooling than 79% 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 Pomona
Pomona and its neighbors
Pomona borders 8 towns with climate data. January nights across them vary by 3.0°. San Dimas has the coldest January nights (43°) and Claremont the hottest July afternoons (91°). Pomona’s January low is 44° and its July high 90°.
Compared with every U.S. town and city on TownTapestry, each counted once.
Then and now
Warmer than it used to be
+2.9°1991–2020 average vs. the 20th century (1901–2000)
The last 30 years in Pomona averaged 2.9° warmer than the 1900s. The biggest change is in January (+3.7°). The shift is larger than in 100% of U.S. towns.
❄️ Winter+2.8°now 56°, was 53°
🌷 Spring+2.9°now 62°, was 59°
☀️ Summer+2.7°now 75°, was 72°
🍂 Fall+3.0°now 68°, was 65°
Change by month1991–2020 average minus 1901–2000 average, at Pomona’s spot on NOAA’s grid
+3.7°
+1.9°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Year to year
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 50° to 67°. August is the most reliable, staying within 8°.
40°
50°
60°
70°
80°
90°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Coldest to warmest month in 30 yearsNormal
Questions
Common questions about Pomona’s climate
What is the coldest month in Pomona?
December, with a typical high of 67° and a low of 43°.
What is the hottest month in Pomona?
August, with a typical high of 92° and a low of 63°. About 71 days a year reach 90°.
How much snow does Pomona get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Pomona?
Frost is uncommon. Only 65% of years see a night at 32° or below.
What is the rainiest month in Pomona?
February, with 4.6 inches of rain and melted snow. The year totals 18 inches.
📍Temperatures and rainfall come from NOAA’s gridded climate normals for Pomona itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Pomona/fairplex, CA (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.