Chilliwack (Roger Pannett, Volunteer Weather Observer for Environment Canada at Chilliwack) – On December 1st, the record,’monsoon rains of November,’concluded with a record breaking 18.0 °C temperature (10.8°C above normal.) It was the warmest December day in Chilliwack since the all time maximum record of 19.0°C on December 27th, 1980.
Three record high temperatures occurred: –
Date New Record Previous Record
December 1st High Minimum 9.5 ⁰C (+8.1 ⁰C) 7.2 ⁰C in 1903.
December 1st . High Mean 13.75 ⁰C (+9.45 ⁰C) 10.9 ⁰C in 1958.
December 1st . High Maximum 18.0 ⁰C (+10.8 ⁰C) 15.6 ⁰C in 1958.
(Peak temperature for the month.)
The Canadian high maximum temperature record occurred in Penticton, at 22.5°C!
With a predominant classic ridge of high pressure over the north Pacific, generally cold moist conditions prevailed throughout December. Arctic air and moisture intensified after mid-month. It was the coldest Christmas Day since 1971 and the snowiest since 2008. During the last week sub-zero and snowy conditions prevailed. Five low temperature records, plus wind chill , were observed.
Date. New Record. Previous Record.
December 26th . Low min -12.2°C ( -12.1°C). -10.8 °C in 1996.
December 26th Low mean -11.75°C ( -13.95°C) -8.7°C in 1971.
December 26th Low max -11.3 °C ( -15.9°C ) -7.4°C in 1934.
(The coldest day in Chilliwack in 25 years. -11.5°C on December 28th, 1996.)
December 27th Low min -16.4°C, with a wind chill at – 26°C! The coldest Chilliwack temperature since the -19.0 °C on November 27th, 1985. Previous low min for date was -14.4°C in 1968.
December 27th. Low mean -14.3 °C (-16.7°C) -13.3 °C in 1968.
The month and year concluded with cold temperatures, but clear sunny skies.
A hope for a better and brighter New Year to come!
With mean temperatures 2.94⁰C below normal, at 0.36°C, it was the coldest December since 2008.
Rainfall was 55% below normal but with snowfall 179% above normal. However with total precipitation 38.9% below normal it was the 23rd consecutive December with below the 30 year average.
| Variable | December 2021 | 30 Year Average |
| Mean Maximum | 2.68 C | 6.2 C |
| Mean Minimum | -1.95 C | 0.4 C |
| Mean Temperature | 0.36 C | 3.3 C |
| Rainfall | 117.4 mm | 259.6 mm |
| Snowfall | 62.4 cm | 34.8 cm |
| Total Precipitation | 179.8 mm | 294.4 mm |
| Days of Rain | 17 days | 18 days |
| Days of Snow | 12 days | 5 days |
| Total Days of Precipitation | 23 days | 22 days |
| Frosts | 16 | 13 |
| Relative humidity average | 72.48 % | . |
