Pasco weather by month
What a typical year looks like in Pasco, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at PASCO TRI CITIES AIRPORT, 1 km from Pasco; records cover 1945–2026.
The year at a glance
- Precipitation a year
- 7.6 in194 mm
- Snow a year
- Rare
- Last spring freeze
- May 4
- First fall freeze
- Oct 11
- Heating degree days
- 5,010
- Cooling degree days
- 788
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 9°−13° (heating, 99%) and 103°39° (cooling, 1%).
Month by month
Pasco in January
Highs average 41°5° and lows 28°−2°, with 1 in26 mm of precipitation in a typical January.
- Record high
- 67°19° (2002)
- Record low
- −19°−28° (2004)
- Heating degree days
- 942
- Cooling degree days
- 0
Pasco in February
Highs average 49°9° and lows 28°−2°, with 0.63 in16 mm of precipitation in a typical February.
- Record high
- 69°21° (2022)
- Record low
- −2°−19° (2019)
- Heating degree days
- 745
- Cooling degree days
- 0
Pasco in March
Highs average 59°15° and lows 33°1°, with 0.69 in18 mm of precipitation in a typical March.
- Record high
- 80°27° (2003)
- Record low
- −1°−18° (2019)
- Heating degree days
- 594
- Cooling degree days
- 0
Pasco in April
Highs average 67°19° and lows 38°4°, with 0.66 in17 mm of precipitation in a typical April.
- Record high
- 94°34° (1998)
- Record low
- 21°−6° (2008)
- Heating degree days
- 371
- Cooling degree days
- 2
Pasco in May
Highs average 77°25° and lows 46°8°, with 0.71 in18 mm of precipitation in a typical May.
- Record high
- 101°38° (2001)
- Record low
- 28°−2° (1999)
- Heating degree days
- 150
- Cooling degree days
- 39
Pasco in June
Highs average 83°28° and lows 53°11°, with 0.61 in15 mm of precipitation in a typical June.
- Record high
- 115°46° (2021)
- Record low
- 37°3° (2002)
- Heating degree days
- 33
- Cooling degree days
- 118
Pasco in July
Highs average 93°34° and lows 57°14°, with 0.15 in3.8 mm of precipitation in a typical July.
- Record high
- 112°44° (2006)
- Record low
- 42°6° (1999)
- Heating degree days
- 3
- Cooling degree days
- 304
Pasco in August
Highs average 91°33° and lows 56°13°, with 0.27 in6.9 mm of precipitation in a typical August.
- Record high
- 111°44° (1998)
- Record low
- 40°4° (2008)
- Heating degree days
- 5
- Cooling degree days
- 259
Pasco in September
Highs average 81°27° and lows 48°9°, with 0.31 in7.9 mm of precipitation in a typical September.
- Record high
- 102°39° (2022)
- Record low
- 26°−3° (2000)
- Heating degree days
- 86
- Cooling degree days
- 63
Pasco in OctoberThis month
Highs average 66°19° and lows 38°4°, with 0.66 in17 mm of precipitation in a typical October.
- Record high
- 90°32° (2020)
- Record low
- 9°−13° (2002)
- Heating degree days
- 402
- Cooling degree days
- 3
Pasco in November
Highs average 50°10° and lows 32°0°, with 0.87 in22 mm of precipitation in a typical November.
- Record high
- 77°25° (1999)
- Record low
- −7°−22° (2010)
- Heating degree days
- 723
- Cooling degree days
- 0
Pasco in December
Highs average 41°5° and lows 27°−3°, with 1 in26 mm of precipitation in a typical December.
- Record high
- 71°22° (2021)
- Record low
- −9°−23° (2016)
- Heating degree days
- 956
- Cooling degree days
- 0