December is one of the cooler months of the year in Greensburg, with average highs near 3.2°C and lows around -4.4°C (mean -0.6°C). It is about average for rainfall, averaging 79 mm of rainfall and 87% relative humidity across the period.
December is one of the cooler months of the year in Greensburg. Across 45 years of records, the warmest December in Greensburg was 2015 — when the month averaged 6.1°C — while the coldest was 1989 at -7.6°C. Typical December days reach 3.2°C with nights near -4.4°C. The long-term trend is warming, about 0.5°C per decade.
December is about average for rainfall in Greensburg, averaging 79 mm of rainfall. The wettest December on record was 1990 with 179 mm, while the driest was 2017 at 37 mm.
Relative humidity in Greensburg during December averages 87%. The most humid December was 2012 at 92%, and the least humid was 1998 at 79%.
December receives about 1.3 kWh/m²/day of solar energy in Greensburg. The sunniest December was 2000 at 1.7 kWh/m²/day, and the cloudiest were 2007 and 2020 at 1.1.
Average wind speed in Greensburg during December is 0.3 m/s. The windiest Decembers were 2002 and 2025 at 0.4 m/s, while the calmest were 2022, 2023 and 2024, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -1.9°C | -0.2°C | -1.3°C | 0.1°C | 0.7°C | +2.6°C |
| Avg High | 1.8°C | 3.6°C | 2.6°C | 3.8°C | 4.7°C | +2.9°C |
| Avg Low | -5.5°C | -4.1°C | -5.2°C | -3.5°C | -3.4°C | +2.1°C |
| Avg Rain | 74 mm | 79 mm | 80 mm | 86 mm | 75 mm | +1 mm |
December temperatures in Greensburg have risen by about 2.2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -23.2°C (1983) to a record high of 21.2°C (1998).
Rainfall in December is about average for rainfall, averaging 79 mm, with a wettest year of 179 mm.
A quieter season to visit Greensburg
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Greensburg. That said, December — with days averaging 3.2°C and nights around -4.4°C (mean -0.6°C) and moderate rainfall (79 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 2.2°C | -2.1°C | -6.4°C | 13.2°C | -13.5°C | 69 mm | 85% | 0.4 m/s | — |
| 2024 | 4.1°C | 0.3°C | -3.5°C | 14.5°C | -11.4°C | 80 mm | 85% | 0.3 m/s | 1.4 |
| 2023 | 7.2°C | 3.3°C | -0.6°C | 15.0°C | -6.6°C | 77 mm | 87% | 0.3 m/s | 1.3 |
| 2022 | 3.3°C | -0.8°C | -4.9°C | 15.8°C | -20.0°C | 63 mm | 87% | 0.3 m/s | 1.4 |
| 2021 | 8.3°C | 3.7°C | -1.0°C | 16.9°C | -6.7°C | 89 mm | 82% | 0.3 m/s | 1.4 |
| 2020 | 2.9°C | -0.5°C | -3.9°C | 15.2°C | -9.5°C | 70 mm | 88% | 0.3 m/s | 1.1 |
| 2019 | 4.8°C | 0.8°C | -3.1°C | 13.3°C | -12.9°C | 75 mm | 88% | 0.3 m/s | 1.3 |
| 2018 | 4.0°C | 0.5°C | -3.1°C | 13.9°C | -9.5°C | 111 mm | 91% | 0.3 m/s | 1.3 |
| 2017 | 1.3°C | -2.1°C | -5.5°C | 11.2°C | -13.6°C | 37 mm | 81% | 0.3 m/s | 1.5 |
| 2016 | 2.1°C | -1.6°C | -5.4°C | 13.0°C | -16.7°C | 94 mm | 85% | 0.3 m/s | 1.2 |
| 2015 🔥 | 10.4°C | 6.1°C | 1.9°C | 19.3°C | -5.5°C | 92 mm | 88% | 0.3 m/s | 1.2 |
| 2014 | 4.0°C | 0.5°C | -2.9°C | 12.8°C | -8.1°C | 72 mm | 85% | 0.3 m/s | 1.2 |
| 2013 | 2.5°C | -1.2°C | -4.9°C | 17.5°C | -12.6°C | 94 mm | 88% | 0.3 m/s | 1.2 |
| 2012 | 5.7°C | 1.9°C | -1.8°C | 18.3°C | -7.9°C | 146 mm | 92% | 0.3 m/s | 1.2 |
| 2011 | 5.1°C | 1.3°C | -2.4°C | 13.9°C | -8.2°C | 87 mm | 90% | 0.3 m/s | 1.4 |
| 2010 | -1.8°C | -4.8°C | -7.8°C | 11.0°C | -11.8°C | 57 mm | 91% | 0.3 m/s | 1.2 |
| 2009 | 1.3°C | -2.3°C | -5.9°C | 10.5°C | -12.1°C | 99 mm | 87% | 0.3 m/s | 1.4 |
| 2008 | 2.6°C | -1.6°C | -5.8°C | 16.1°C | -16.0°C | 150 mm | 84% | 0.3 m/s | 1.3 |
| 2007 | 3.3°C | -0.5°C | -4.3°C | 13.5°C | -12.9°C | 131 mm | 91% | 0.3 m/s | 1.1 |
| 2006 | 7.0°C | 2.4°C | -2.2°C | 20.3°C | -9.4°C | 42 mm | 83% | 0.3 m/s | 1.6 |
| 2005 | -0.3°C | -3.8°C | -7.2°C | 7.9°C | -15.2°C | 48 mm | 91% | 0.3 m/s | 1.4 |
| 2004 | 3.7°C | -0.5°C | -4.6°C | 15.9°C | -14.9°C | 68 mm | 86% | 0.3 m/s | 1.3 |
| 2003 | 2.0°C | -1.4°C | -4.9°C | 11.0°C | -11.6°C | 80 mm | 88% | 0.3 m/s | 1.4 |
| 2002 | 1.0°C | -2.5°C | -5.9°C | 10.1°C | -12.3°C | 68 mm | 88% | 0.4 m/s | 1.3 |
| 2001 | 6.5°C | 2.4°C | -1.6°C | 20.4°C | -10.1°C | 65 mm | 81% | 0.3 m/s | 1.4 |
| 2000 | -1.6°C | -5.4°C | -9.2°C | 6.5°C | -16.8°C | 50 mm | 83% | 0.3 m/s | 1.7 |
| 1999 | 4.1°C | 0.2°C | -3.6°C | 16.9°C | -11.4°C | 53 mm | 82% | 0.3 m/s | 1.4 |
| 1998 | 6.9°C | 2.1°C | -2.8°C | 21.2°C | -13.5°C | 50 mm | 79% | 0.3 m/s | 1.4 |
| 1997 | 2.7°C | -0.5°C | -3.7°C | 9.7°C | -11.1°C | 43 mm | 89% | 0.3 m/s | 1.4 |
| 1996 | 4.4°C | 0.7°C | -3.0°C | 13.6°C | -13.5°C | 81 mm | 91% | 0.3 m/s | 1.2 |
| 1995 | -0.9°C | -4.3°C | -7.7°C | 10.3°C | -14.9°C | 55 mm | 87% | 0.3 m/s | 1.5 |
| 1994 | 6.2°C | 1.8°C | -2.7°C | 14.8°C | -8.5°C | 70 mm | 85% | 0.3 m/s | 1.4 |
| 1993 | 2.0°C | -1.6°C | -5.2°C | 8.8°C | -14.9°C | 55 mm | 88% | 0.3 m/s | 1.3 |
| 1992 | 1.6°C | -1.8°C | -5.2°C | 12.5°C | -12.0°C | 104 mm | 90% | 0.3 m/s | 1.4 |
| 1991 | 3.9°C | -0.1°C | -4.0°C | 14.7°C | -13.6°C | 105 mm | 85% | 0.3 m/s | 1.4 |
| 1990 🌧️ | 5.5°C | 1.0°C | -3.6°C | 15.8°C | -12.4°C | 179 mm | 87% | 0.3 m/s | 1.3 |
| 1989 ❄️ | -3.9°C | -7.6°C | -11.2°C | 5.1°C | -18.8°C | 57 mm | 88% | 0.3 m/s | 1.5 |
| 1988 | 2.2°C | -1.8°C | -5.7°C | 12.3°C | -12.3°C | 52 mm | 79% | 0.3 m/s | 1.4 |
| 1987 | 3.5°C | -0.1°C | -3.7°C | 12.4°C | -10.9°C | 75 mm | 88% | 0.3 m/s | 1.2 |
| 1986 | 2.5°C | -0.9°C | -4.4°C | 12.3°C | -11.2°C | 86 mm | 88% | 0.3 m/s | 1.4 |
| 1985 | -0.2°C | -4.0°C | -7.8°C | 9.8°C | -17.2°C | 59 mm | 89% | 0.3 m/s | 1.3 |
| 1984 | 6.4°C | 2.3°C | -1.7°C | 17.8°C | -10.8°C | 89 mm | 88% | 0.3 m/s | 1.2 |
| 1983 | -1.8°C | -5.1°C | -8.5°C | 10.7°C | -23.2°C | 107 mm | 89% | 0.3 m/s | — |
| 1982 | 7.1°C | 3.0°C | -1.0°C | 19.2°C | -9.9°C | 62 mm | 86% | 0.3 m/s | — |
| 1981 | 0.5°C | -2.7°C | -5.8°C | 6.3°C | -15.7°C | 74 mm | 88% | 0.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 3.2°C with lows near -4.4°C (mean -0.6°C), based on 45 years of NASA POWER data.
December averages 79 mm of rainfall in Greensburg, about average for rainfall. The wettest on record was 179 mm in 1990.
The hottest December reached 21.2°C in 1998. The coldest dipped to -23.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.2°C. Daytime highs moved from 2.4°C to 5°C and overnight lows from -5°C to -3.3°C over the same span.
December is one of the cooler months of the year in Greensburg and about average for rainfall, so plan for around 3.2°C daytime highs and -4.4°C at night.
Not quite — December is the 3rd coolest month in Greensburg, averaging -0.6°C.
For December in Greensburg, pack warm layers and a jacket for chilly mornings, with typical highs of 3.2°C and lows of -4.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 87% — quite humid.
Average wind speed in December is 0.3 m/s. The windiest December on record averaged 0.4 m/s (2002).
The wettest December on record was 1990 with 179 mm. On average, December sees 79 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Greensburg behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
