January is one of the cooler months of the year in Summerside, with average highs near -3.5°C and lows around -10.2°C (mean -6.8°C). It is about average for rainfall, averaging 83 mm of rainfall and 90% relative humidity across the period.
January is one of the cooler months of the year in Summerside. Across 45 years of records, the warmest Januarys in Summerside were 2006 and 2023 — when the month averaged -2.9°C — while the coldest were 1981 and 1985 at -10.8°C. Typical January days reach -3.5°C with nights near -10.2°C. The long-term trend is warming, about 0.8°C per decade.
January is about average for rainfall in Summerside, averaging 83 mm of rainfall. The wettest January on record was 2023 with 156 mm, while the driest was 2013 at 24 mm.
Relative humidity in Summerside during January averages 90%. The most humid January was 1981 at 96%, and the least humid was 1996 at 84%.
January receives about 1.1 kWh/m²/day of solar energy in Summerside. The sunniest January was 2024 at 1.3 kWh/m²/day, and the cloudiest were 1984 and 1993 at 0.9.
Average wind speed in Summerside during January is 4.8 m/s. The windiest January was 1982 at 6.1 m/s, while the calmest was 1984 at 3.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -8.3°C | -7.4°C | -6.9°C | -6.1°C | -4.9°C | +3.4°C |
| Avg High | -4.6°C | -3.7°C | -3.8°C | -2.9°C | -2.0°C | +2.6°C |
| Avg Low | -11.9°C | -11.2°C | -10.1°C | -9.4°C | -7.8°C | +4.1°C |
| Avg Rain | 98 mm | 69 mm | 86 mm | 80 mm | 84 mm | -14 mm |
January temperatures in Summerside have risen by about 4.4°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -29.4°C (1982) to a record high of 12.8°C (2018).
Rainfall in January is about average for rainfall, averaging 83 mm, with a wettest year of 156 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 1°C per decade, narrowing the gap between day and night.
A quieter season to visit Summerside
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Summerside. That said, January — with days averaging -3.5°C and nights around -10.2°C (mean -6.8°C) and higher rainfall (83 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 | -2.5°C | -5.0°C | -7.5°C | 3.7°C | -14.9°C | 58 mm | 87% | 5 m/s | 1.2 |
| 2024 | -1.5°C | -4.4°C | -7.3°C | 4.4°C | -11.6°C | 47 mm | 85% | 4.7 m/s | 1.3 |
| 2023 🌧️ | -0.3°C | -2.9°C | -5.6°C | 6.0°C | -11.7°C | 156 mm | 89% | 4.3 m/s | 1.1 |
| 2022 | -3.3°C | -7.6°C | -12.0°C | 5.3°C | -19.5°C | 116 mm | 91% | 4.9 m/s | 1.1 |
| 2021 | -1.2°C | -3.1°C | -5.1°C | 1.8°C | -12.2°C | 56 mm | 88% | 4.3 m/s | 1.1 |
| 2020 | -3.0°C | -6.3°C | -9.5°C | 7.0°C | -17.5°C | 74 mm | 92% | 4.3 m/s | 1 |
| 2019 | -3.3°C | -7.8°C | -12.3°C | 8.4°C | -22.0°C | 115 mm | 93% | 4.4 m/s | 1 |
| 2018 | -3.4°C | -7.3°C | -11.3°C | 12.8°C | -19.6°C | 87 mm | 89% | 5.2 m/s | 1 |
| 2017 | -2.1°C | -5.2°C | -8.2°C | 6.3°C | -19.7°C | 99 mm | 89% | 4.6 m/s | 1.1 |
| 2016 | -2.4°C | -5.0°C | -7.5°C | 6.2°C | -12.2°C | 67 mm | 89% | 4.7 m/s | 1.1 |
| 2015 | -4.8°C | -8.7°C | -12.6°C | 4.5°C | -19.7°C | 121 mm | 90% | 4.9 m/s | 1.1 |
| 2014 | -3.0°C | -6.9°C | -10.7°C | 7.8°C | -19.9°C | 77 mm | 90% | 4.9 m/s | 1.1 |
| 2013 | -3.8°C | -7.0°C | -10.3°C | 11.5°C | -18.1°C | 24 mm | 89% | 5.4 m/s | 1 |
| 2012 | -1.5°C | -4.7°C | -7.9°C | 6.2°C | -12.3°C | 66 mm | 87% | 4.9 m/s | 1.1 |
| 2011 | -2.8°C | -5.2°C | -7.7°C | 2.1°C | -18.9°C | 79 mm | 92% | 4.9 m/s | 1 |
| 2010 | -1.5°C | -3.5°C | -5.6°C | 6.2°C | -14.2°C | 69 mm | 89% | 4.9 m/s | 1 |
| 2009 | -6.2°C | -10.0°C | -13.8°C | 1.8°C | -24.0°C | 73 mm | 92% | 4.8 m/s | 1.1 |
| 2008 | -2.6°C | -5.7°C | -8.7°C | 6.4°C | -19.6°C | 121 mm | 92% | 4.7 m/s | 1 |
| 2007 | -2.6°C | -5.5°C | -8.5°C | 7.8°C | -17.1°C | 116 mm | 90% | 5.3 m/s | 1.2 |
| 2006 🔥 | -0.1°C | -2.9°C | -5.7°C | 9.1°C | -10.7°C | 71 mm | 90% | 4.5 m/s | 1 |
| 2005 | -5.1°C | -7.9°C | -10.7°C | 10.6°C | -16.3°C | 74 mm | 87% | 5.1 m/s | 1.1 |
| 2004 | -7.0°C | -9.8°C | -12.7°C | 3.0°C | -23.0°C | 44 mm | 90% | 5.5 m/s | 1.1 |
| 2003 | -5.9°C | -9.1°C | -12.3°C | 0.7°C | -19.6°C | 47 mm | 93% | 4.7 m/s | 1.1 |
| 2002 | -2.6°C | -5.5°C | -8.5°C | 1.1°C | -14.2°C | 81 mm | 91% | 4.4 m/s | 1 |
| 2001 | -3.9°C | -7.1°C | -10.3°C | 0.1°C | -15.0°C | 90 mm | 93% | 3.9 m/s | 1.1 |
| 2000 | -2.4°C | -6.0°C | -9.6°C | 10.4°C | -16.8°C | 143 mm | 89% | 5.2 m/s | 1 |
| 1999 | -2.1°C | -5.9°C | -9.7°C | 9.3°C | -19.5°C | 74 mm | 85% | 5 m/s | 1.1 |
| 1998 | -2.8°C | -6.2°C | -9.6°C | 4.7°C | -17.7°C | 105 mm | 92% | 5.2 m/s | 1.1 |
| 1997 | -3.0°C | -7.1°C | -11.3°C | 7.4°C | -19.2°C | 56 mm | 87% | 5.5 m/s | 1.1 |
| 1996 | -3.1°C | -6.9°C | -10.7°C | 9.2°C | -18.7°C | 51 mm | 84% | 5 m/s | 1 |
| 1995 | -2.4°C | -5.1°C | -7.8°C | 8.1°C | -16.8°C | 77 mm | 92% | 4.4 m/s | 1 |
| 1994 | -6.0°C | -10.6°C | -15.3°C | 7.5°C | -23.4°C | 56 mm | 89% | 5.3 m/s | 1 |
| 1993 | -4.7°C | -8.3°C | -11.8°C | 7.8°C | -24.5°C | 41 mm | 87% | 4.5 m/s | 0.9 |
| 1992 | -4.8°C | -8.0°C | -11.2°C | 7.5°C | -20.2°C | 46 mm | 89% | 5.1 m/s | 1.2 |
| 1991 | -5.8°C | -10.0°C | -14.3°C | 1.1°C | -23.5°C | 76 mm | 93% | 4.7 m/s | 1.1 |
| 1990 | -2.0°C | -6.0°C | -9.9°C | 9.4°C | -20.0°C | 107 mm | 92% | 4.7 m/s | 1.1 |
| 1989 | -2.9°C | -7.2°C | -11.5°C | 3.4°C | -18.2°C | 54 mm | 90% | 4.8 m/s | 1.2 |
| 1988 | -3.9°C | -7.6°C | -11.3°C | 2.8°C | -23.0°C | 62 mm | 95% | 4.5 m/s | 1.1 |
| 1987 | -4.6°C | -7.7°C | -10.7°C | 2.0°C | -21.7°C | 104 mm | 92% | 4.6 m/s | 1 |
| 1986 | -2.7°C | -7.0°C | -11.3°C | 10.4°C | -24.8°C | 113 mm | 92% | 5.3 m/s | 1 |
| 1985 | -7.7°C | -10.8°C | -14.0°C | -0.7°C | -19.9°C | 70 mm | 94% | 5.4 m/s | 1.2 |
| 1984 | -4.4°C | -7.9°C | -11.4°C | 1.5°C | -24.7°C | 132 mm | 93% | 3.7 m/s | 0.9 |
| 1983 | -2.4°C | -5.5°C | -8.5°C | 8.6°C | -16.5°C | 77 mm | 89% | 4.5 m/s | — |
| 1982 | -6.4°C | -10.2°C | -13.9°C | 3.9°C | -29.4°C | 148 mm | 95% | 6.1 m/s | — |
| 1981 ❄️ | -6.8°C | -10.8°C | -14.8°C | 2.0°C | -26.8°C | 121 mm | 96% | 4.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around -3.5°C with lows near -10.2°C (mean -6.8°C), based on 45 years of NASA POWER data.
January averages 83 mm of rainfall in Summerside, about average for rainfall. The wettest on record was 156 mm in 2023.
The hottest January reached 12.8°C in 2018. The coldest dipped to -29.4°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 4.4°C. Daytime highs moved from -5.5°C to -1.8°C and overnight lows from -12.5°C to -7.5°C over the same span.
January is one of the cooler months of the year in Summerside and about average for rainfall, so plan for around -3.5°C daytime highs and -10.2°C at night.
Not quite — January is the 2nd coolest month in Summerside, averaging -6.8°C.
For January in Summerside, pack warm layers and a jacket for chilly mornings, with typical highs of -3.5°C and lows of -10.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 90% — quite humid.
Average wind speed in January is 4.8 m/s. The windiest January on record averaged 6.1 m/s (1982).
The wettest January on record was 2023 with 156 mm. On average, January sees 83 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 Summerside behaves each January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
