December is one of the cooler months of the year in Bay Shore, with average highs near 7.3°C and lows around 3.1°C (mean 5.2°C). It is a relatively wet time of year, averaging 124 mm of rainfall and 80% relative humidity across the period.
December is one of the cooler months of the year in Bay Shore. Across 45 years of records, the warmest December in Bay Shore was 2015 — when the month averaged 10.4°C — while the coldest was 1989 at -0.5°C. Typical December days reach 7.3°C with nights near 3.1°C. The long-term trend is warming, about 0.4°C per decade.
December is a relatively wet time of year in Bay Shore, averaging 124 mm of rainfall. The wettest December on record was 2018 with 243 mm, while the driest was 1985 at 33 mm.
Relative humidity in Bay Shore during December averages 80%. The most humid December was 2015 at 86%, and the least humid was 2001 at 76%.
December receives about 1.6 kWh/m²/day of solar energy in Bay Shore. The sunniest December was 2000 at 1.9 kWh/m²/day, and the cloudiest were 1992 and 1996 at 1.3.
Average wind speed in Bay Shore during December is 6.3 m/s. The windiest December was 2003 at 7.4 m/s, while the calmest were 2015, 2021 and 2023 at 5.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 4.1°C | 5.3°C | 5.0°C | 5.8°C | 5.8°C | +1.7°C |
| Avg High | 6.3°C | 7.4°C | 7.2°C | 7.7°C | 7.8°C | +1.5°C |
| Avg Low | 2.0°C | 3.2°C | 2.8°C | 3.8°C | 3.7°C | +1.7°C |
| Avg Rain | 92 mm | 112 mm | 119 mm | 156 mm | 148 mm | +55 mm |
December temperatures in Bay Shore have risen by about 1°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -9.6°C (1987) to a record high of 17°C (2006).
Rainfall in December is a relatively wet time of year, averaging 124 mm, with a wettest year of 243 mm.
A quieter season to visit Bay Shore
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Bay Shore. That said, December — with days averaging 7.3°C and nights around 3.1°C (mean 5.2°C) and higher rainfall (124 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 | 5.8°C | 3.3°C | 0.7°C | 12.7°C | -4.2°C | 87 mm | 78% | 6.7 m/s | — |
| 2024 | 7.3°C | 5.3°C | 3.4°C | 16.1°C | -4.5°C | 159 mm | 80% | 5.9 m/s | 1.8 |
| 2023 | 9.1°C | 7.3°C | 5.5°C | 16.2°C | 0.4°C | 233 mm | 83% | 5.2 m/s | 1.5 |
| 2022 | 7.3°C | 5.2°C | 3.1°C | 14.2°C | -8.0°C | 168 mm | 82% | 6.7 m/s | 1.7 |
| 2021 | 9.6°C | 7.7°C | 5.8°C | 14.4°C | 0.2°C | 50 mm | 79% | 5.2 m/s | 1.6 |
| 2020 | 8.0°C | 5.9°C | 3.7°C | 15.7°C | -1.2°C | 188 mm | 81% | 6.6 m/s | 1.5 |
| 2019 | 7.2°C | 5.2°C | 3.1°C | 13.1°C | -5.1°C | 240 mm | 84% | 6.2 m/s | 1.4 |
| 2018 🌧️ | 7.1°C | 5.4°C | 3.7°C | 13.0°C | -0.4°C | 243 mm | 80% | 5.6 m/s | 1.6 |
| 2017 | 5.8°C | 3.8°C | 1.9°C | 14.4°C | -9.3°C | 99 mm | 79% | 6 m/s | 1.6 |
| 2016 | 7.5°C | 5.3°C | 3.1°C | 15.4°C | -3.6°C | 114 mm | 77% | 6.4 m/s | 1.6 |
| 2015 🔥 | 12.1°C | 10.4°C | 8.7°C | 15.6°C | 3.1°C | 211 mm | 86% | 5.2 m/s | 1.5 |
| 2014 | 7.6°C | 5.7°C | 3.8°C | 13.3°C | -0.7°C | 173 mm | 83% | 6 m/s | 1.4 |
| 2013 | 7.3°C | 5.1°C | 3.0°C | 13.2°C | -3.1°C | 136 mm | 83% | 5.9 m/s | 1.5 |
| 2012 | 9.2°C | 7.2°C | 5.2°C | 14.4°C | -0.3°C | 159 mm | 83% | 6.1 m/s | 1.5 |
| 2011 | 9.5°C | 7.4°C | 5.3°C | 13.7°C | -1.0°C | 98 mm | 78% | 5.4 m/s | 1.8 |
| 2010 | 3.8°C | 2.1°C | 0.4°C | 14.6°C | -3.9°C | 91 mm | 79% | 7.3 m/s | 1.6 |
| 2009 | 6.5°C | 4.2°C | 1.9°C | 16.5°C | -5.5°C | 192 mm | 80% | 7.3 m/s | 1.7 |
| 2008 | 8.1°C | 5.4°C | 2.7°C | 15.4°C | -6.9°C | 201 mm | 81% | 6.9 m/s | 1.5 |
| 2007 | 6.7°C | 4.7°C | 2.7°C | 13.1°C | -1.7°C | 144 mm | 81% | 6.1 m/s | 1.5 |
| 2006 | 9.6°C | 7.5°C | 5.4°C | 17.0°C | -4.1°C | 59 mm | 79% | 6.2 m/s | 1.8 |
| 2005 | 6.0°C | 4.0°C | 2.0°C | 12.7°C | -4.4°C | 99 mm | 80% | 6.3 m/s | 1.7 |
| 2004 | 7.4°C | 5.0°C | 2.7°C | 14.1°C | -7.4°C | 94 mm | 81% | 6.5 m/s | 1.7 |
| 2003 | 6.9°C | 4.7°C | 2.5°C | 13.3°C | -2.1°C | 123 mm | 81% | 7.4 m/s | 1.7 |
| 2002 | 6.1°C | 4.2°C | 2.3°C | 13.2°C | -4.0°C | 128 mm | 80% | 6.7 m/s | 1.6 |
| 2001 | 9.8°C | 7.8°C | 5.7°C | 16.2°C | -1.2°C | 63 mm | 76% | 5.8 m/s | 1.7 |
| 2000 | 4.4°C | 2.1°C | -0.2°C | 15.0°C | -5.9°C | 84 mm | 77% | 6.6 m/s | 1.9 |
| 1999 | 8.0°C | 6.1°C | 4.2°C | 14.2°C | -2.7°C | 65 mm | 77% | 6.4 m/s | 1.7 |
| 1998 | 8.3°C | 6.3°C | 4.4°C | 16.6°C | -5.1°C | 38 mm | 77% | 5.4 m/s | 1.4 |
| 1997 | 6.8°C | 4.8°C | 2.9°C | 11.0°C | -4.5°C | 120 mm | 79% | 6.2 m/s | 1.6 |
| 1996 | 8.0°C | 6.2°C | 4.4°C | 13.4°C | -4.0°C | 196 mm | 84% | 6 m/s | 1.3 |
| 1995 | 4.2°C | 2.1°C | 0.0°C | 11.5°C | -4.7°C | 69 mm | 82% | 6.9 m/s | 1.6 |
| 1994 | 8.3°C | 6.2°C | 4.0°C | 13.7°C | -3.9°C | 93 mm | 80% | 6.1 m/s | 1.6 |
| 1993 | 6.4°C | 4.1°C | 1.9°C | 12.8°C | -7.5°C | 131 mm | 80% | 6.3 m/s | 1.5 |
| 1992 | 6.9°C | 4.8°C | 2.6°C | 11.1°C | -3.9°C | 158 mm | 81% | 6.8 m/s | 1.3 |
| 1991 | 7.8°C | 5.4°C | 3.0°C | 14.2°C | -5.3°C | 120 mm | 79% | 6.3 m/s | 1.5 |
| 1990 | 9.2°C | 6.7°C | 4.2°C | 14.3°C | -1.1°C | 133 mm | 81% | 6.8 m/s | 1.4 |
| 1989 ❄️ | 1.8°C | -0.5°C | -2.9°C | 9.9°C | -8.6°C | 35 mm | 81% | 6.8 m/s | 1.5 |
| 1988 | 5.8°C | 3.6°C | 1.3°C | 12.3°C | -8.1°C | 48 mm | 77% | 6.5 m/s | 1.7 |
| 1987 | 6.9°C | 4.9°C | 2.9°C | 12.3°C | -9.6°C | 76 mm | 78% | 6.4 m/s | 1.6 |
| 1986 | 7.3°C | 5.5°C | 3.6°C | 15.1°C | -2.0°C | 168 mm | 78% | 6.4 m/s | 1.6 |
| 1985 | 6.1°C | 3.6°C | 1.1°C | 13.7°C | -5.3°C | 33 mm | 78% | 6.5 m/s | 1.6 |
| 1984 | 9.4°C | 7.1°C | 4.8°C | 13.4°C | -1.9°C | 84 mm | 81% | 5.7 m/s | 1.4 |
| 1983 | 5.6°C | 3.4°C | 1.3°C | 13.3°C | -8.1°C | 179 mm | 83% | 7 m/s | — |
| 1982 | 8.8°C | 6.7°C | 4.7°C | 15.6°C | -5.0°C | 69 mm | 83% | 5.7 m/s | — |
| 1981 | 5.0°C | 3.0°C | 1.0°C | 12.5°C | -4.0°C | 139 mm | 82% | 6.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 7.3°C with lows near 3.1°C (mean 5.2°C), based on 45 years of NASA POWER data.
December averages 124 mm of rainfall in Bay Shore, a relatively wet time of year. The wettest on record was 243 mm in 2018.
The hottest December reached 17°C in 2006. The coldest dipped to -9.6°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1°C. Daytime highs moved from 7°C to 7.8°C and overnight lows from 2.6°C to 3.7°C over the same span.
December is one of the cooler months of the year in Bay Shore and a relatively wet time of year, so plan for around 7.3°C daytime highs and 3.1°C at night.
Not quite — December is the 4th coolest month in Bay Shore, averaging 5.2°C.
For December in Bay Shore, pack warm layers and a jacket for chilly mornings, with typical highs of 7.3°C and lows of 3.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 80% — quite humid.
Average wind speed in December is 6.3 m/s. The windiest December on record averaged 7.4 m/s (2003).
The wettest December on record was 2018 with 243 mm. On average, December sees 124 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 Bay Shore 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.
