Delta weather by month
What a typical year looks like in Delta, Utah: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Delta, 5 km from Delta; records cover 1965–2026.
The year at a glance
- Precipitation a year
- 8 in203 mm
- Snow a year
- 25 in64 cm
- Last spring freeze
- May 17
- First fall freeze
- Sep 25
- Heating degree days
- 6,094
- Cooling degree days
- 884
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 104°40° (cooling, 1%).
Month by month
Delta in January
Highs average 39°4° and lows 16°−9°, with 0.63 in16 mm of precipitation and 6 in14 cm of snow in a typical January.
- Record high
- 64°18° (2003)
- Record low
- −25°−32° (1971)
- Heating degree days
- 1166
- Cooling degree days
- 0
Delta in February
Highs average 47°8° and lows 21°−6°, with 0.64 in16 mm of precipitation and 5 in13 cm of snow in a typical February.
- Record high
- 74°23° (1972)
- Record low
- −27°−33° (1989)
- Heating degree days
- 881
- Cooling degree days
- 0
Delta in March
Highs average 58°14° and lows 27°−3°, with 0.8 in20 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 93°34° (2026)
- Record low
- −8°−22° (1966)
- Heating degree days
- 696
- Cooling degree days
- 0
Delta in April
Highs average 65°18° and lows 33°0°, with 0.94 in24 mm of precipitation and 2.2 in5.6 cm of snow in a typical April.
- Record high
- 94°34° (2012)
- Record low
- 12°−11° (1997)
- Heating degree days
- 488
- Cooling degree days
- 1
Delta in May
Highs average 76°24° and lows 41°5°, with 0.92 in23 mm of precipitation in a typical May.
- Record high
- 103°39° (2003)
- Record low
- 15°−9° (2008)
- Heating degree days
- 234
- Cooling degree days
- 24
Delta in June
Highs average 87°30° and lows 49°10°, with 0.48 in12 mm of precipitation in a typical June.
- Record high
- 107°42° (2021)
- Record low
- 25°−4° (1976)
- Heating degree days
- 54
- Cooling degree days
- 144
Delta in July
Highs average 95°35° and lows 57°14°, with 0.35 in8.9 mm of precipitation in a typical July.
- Record high
- 110°43° (2002)
- Record low
- 37°3° (1992)
- Heating degree days
- 2
- Cooling degree days
- 351
Delta in August
Highs average 93°34° and lows 56°13°, with 0.54 in14 mm of precipitation in a typical August.
- Record high
- 108°42° (2026)
- Record low
- 35°2° (1992)
- Heating degree days
- 4
- Cooling degree days
- 291
Delta in September
Highs average 82°28° and lows 46°8°, with 0.71 in18 mm of precipitation in a typical September.
- Record high
- 106°41° (2022)
- Record low
- 21°−6° (2003)
- Heating degree days
- 103
- Cooling degree days
- 70
Delta in OctoberThis month
Highs average 68°20° and lows 33°1°, with 0.91 in23 mm of precipitation and 0.8 in2 cm of snow in a typical October.
- Record high
- 93°34° (2024)
- Record low
- −2°−19° (1971)
- Heating degree days
- 454
- Cooling degree days
- 3
Delta in November
Highs average 51°11° and lows 23°−5°, with 0.5 in13 mm of precipitation and 3 in8 cm of snow in a typical November.
- Record high
- 79°26° (2006)
- Record low
- −13°−25° (2006)
- Heating degree days
- 837
- Cooling degree days
- 0
Delta in December
Highs average 39°4° and lows 15°−10°, with 0.59 in15 mm of precipitation and 4 in11 cm of snow in a typical December.
- Record high
- 72°22° (2025)
- Record low
- −30°−34° (1990)
- Heating degree days
- 1175
- Cooling degree days
- 0