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Monthly climate in Palo Alto, Pennsylvania, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Palo Alto features a humid continental climate (Dfa).Temperatures typically range between -1 °C (30 °F) and 24 °C (75 °F) through the year, but rarely can drop to -20 °C (-4 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 1382 mm (54.4 inches) and receives 142 rainy days on the 1 mm (0.04 inches) threshold annually.Palo Alto enjoys an average of 2774 hours of sunshine throughout the year, and daylight varies from 9 hours 17 minutes to 15 hours 1 minutes per day.

Monthly average temperatures in Palo Alto, Pennsylvania, United States §

The warmest months in Palo Alto are June, July and August, with daily mean temperatures ranging from 21 to 24 °C (69 - 75 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 1 °C (30 - 35 °F) throughout the day. On average each year, Palo Alto experiences 74 days above 25 °C (77.0 °F) and 96 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Palo Alto, Pennsylvania, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 17°C
(63°F)		 24°C
(76°F)		 24°C
(75°F)		 28°C
(83°F)		 32°C
(89°F)		 34°C
(94°F)		 34°C
(94°F)		 34°C
(93°F)		 32°C
(90°F)		 31°C
(88°F)		 23°C
(74°F)		 17°C
(62°F)
Mean maximum 13°C
(55°F)		 17°C
(63°F)		 21°C
(70°F)		 25°C
(78°F)		 30°C
(86°F)		 32°C
(90°F)		 34°C
(93°F)		 32°C
(90°F)		 31°C
(87°F)		 27°C
(81°F)		 21°C
(70°F)		 14°C
(58°F)
Average high 2°C
(36°F)		 5°C
(41°F)		 9°C
(48°F)		 15°C
(59°F)		 21°C
(69°F)		 26°C
(78°F)		 29°C
(84°F)		 27°C
(81°F)		 24°C
(75°F)		 18°C
(65°F)		 10°C
(49°F)		 5°C
(41°F)
Daily mean -1°C
(30°F)		 1°C
(33°F)		 4°C
(39°F)		 10°C
(50°F)		 16°C
(61°F)		 21°C
(69°F)		 24°C
(75°F)		 22°C
(73°F)		 19°C
(67°F)		 13°C
(57°F)		 5°C
(42°F)		 1°C
(35°F)
Average low -5°C
(24°F)		 -3°C
(26°F)		 -0°C
(31°F)		 5°C
(42°F)		 11°C
(52°F)		 16°C
(60°F)		 19°C
(67°F)		 18°C
(65°F)		 15°C
(59°F)		 9°C
(49°F)		 1°C
(34°F)		 -2°C
(29°F)
Mean minimum -15°C
(5°F)		 -15°C
(6°F)		 -10°C
(15°F)		 -2°C
(29°F)		 3°C
(37°F)		 10°C
(50°F)		 14°C
(57°F)		 12°C
(55°F)		 7°C
(45°F)		 1°C
(34°F)		 -7°C
(19°F)		 -11°C
(13°F)
Minimum -20°C
(-4°F)		 -20°C
(-4°F)		 -19°C
(-3°F)		 -4°C
(25°F)		 -2°C
(29°F)		 7°C
(44°F)		 13°C
(56°F)		 11°C
(52°F)		 3°C
(37°F)		 0°C
(33°F)		 -13°C
(9°F)		 -16°C
(4°F)

Compare climate in Palo Alto with other places

Compare temperature, precipitation, sunshine, UV index in Palo Alto, Pennsylvania, United States with other places around the world.

Monthly average precipitation in Palo Alto, Pennsylvania, United States §

Palo Alto usually has the most precipitation in May, July and August, with an average of 14 rainy days and 150 mm (5.9 inches) of precipitation per month.The driest months in Palo Alto are January, March and December. On average, 88 mm (3.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Palo Alto, Pennsylvania, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 74 (2.9) 106 (4.2) 96 (3.8) 111 (4.4) 133 (5.2) 118 (4.6) 163 (6.4) 155 (6.1) 117 (4.6) 117 (4.6) 99 (3.9) 93 (3.7)
Average precipitation days (≥ 1 mm) 8 13 11 13 14 14 14 15 9 11 9 11

Monthly sunshine hours in Palo Alto, Pennsylvania, United States §

The sunniest months in Palo Alto are June, July and August, when the sun shines an average of 10 hours 15 minutes a day.Least sunny months in Palo Alto: January, February and December receive an average of 4 hours 50 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Palo Alto, Pennsylvania, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 124 158 226 232 259 305 334 303 266 210 194 157
Mean daily daylight hours 9h 37m 10h 39m 11h 58m 13h 19m 14h 27m 15h 1m 14h 43m 13h 42m 12h 24m 11h 4m 9h 53m 9h 17m

Solar UV radiation in Palo Alto, Pennsylvania, United States §

Palo Alto experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Palo Alto UV Index data.

Average daily maximum UV levels by month for Palo Alto, Pennsylvania, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 6 9 10 10 10 9 8 6 4 2