Climate and monthly weather forecastCalais, Guernsey
Climate and monthly weather forecast
The climate of Calais
Recognized by the Köppen climate classification as a Marine west coast, warm summer zone (Cfb), Calais faces evenly distributed rainfall throughout the year. Located in Guernsey, its climate is significantly influenced by the close proximity of the English Channel. Neutral in tone across the twelve months, the temperature swings between a low of 7°C (44.6°F) in February to a high of 17.8°C (64°F) in August. Correspondingly, the relative humidity is usually high, fluctuating from 77% in January and December to 84% in June and July.Monthly average rainfall canvasses a range from 26mm (1.02") in July to 87mm (3.43") in November. The number of rainfall days varies from 11.5 days in June to 22.8 days in November, indicating a relatively wet climate. Snowfall, meanwhile, is almost nonexistent, with just 2mm (0.08") recorded in January. Daylight hours peak to 16.2 hours in June, before dropping to a low of 8.3 hours in December. Likewise, maximum sunshine hours occur from June to July with an average of 9.7 hours, whereas December and January observe the minimum with 3.9 hours.
Calais witnesses moderate wind speeds, the highest observed in December at 36km/h (22.4mph) and the least during July at 21.9km/h (13.6mph). Gust speed also peaks during December, reaching up to 49.8km/h (30.9mph). Cloud coverage is fairly consistent throughout the year, with percentages ranging from 37 in July to 63 in January and December.
The best time to visit Calais
The optimal time to visit Calais would be during the warmer months, particularly between June and August. During these months, the average high temperature hovers around 15.2°C (59.4°F) to 17.8°C (64°F), accompanied by the maximum sunshine hours observed throughout the year. With a UV index at five, visitors can enjoy outdoor activities while temperatures offer both comfort and warmth.The worst time to visit Calais
Travelers looking for extended outdoor activities would want to avoid Calais in November and December. November sees the peak in rain, with the average rainfall reaching 87mm (3.43") over approximately 23 days. Couple this with short daylight hours, just 9.1 in November and 8.3 in December, and the scope for outdoor exploration significantly dwindles.Spring weather in Calais
Spring brings warmer temperatures to Calais from March through May. Average high temperature transitions from 9.8°C (49.6°F) in March to 12.8°C (55°F) by May, along with noticeable increase in daylight hours, from 11.9 hours in March to 15.4 hours in May. Rainfall decreases over this period, with March witnessing 38mm (1.5") over 17 days, reducing to 27mm (1.06") over 11.8 days by May.Summer weather in Calais
Summer in Calais, spanning June through August, is defined by increased temperatures and extended daylight hours. Daylight is at its peak during June at 16.2 hours. High and low temperatures reach their maximum during these months, with August boasting an average high of 17.8°C (64°F) and a low of 15.8°C (60.4°F). July is the driest month with rainfall at 26mm (1.02") over almost 13 days.Autumn weather in Calais
September ushers in the autumn season in Calais, leading to a gradual drop in temperature and daylight hours over the next three months. While September still showcases pleasant temperatures, ranging from 15.4°C (59.7°F) to 17.2°C (63°F), by November these scale back to between 10.9°C (51.6°F) and 13°C (55.4°F). Rainfall significantly increases during this period, with November seeing a high of 87mm (3.43") over approximately 23 days.Winter weather in Calais
Winter in Calais, from December through February, is characterized by low temperatures, shorter daylight hours, and consistent rainfall. December bears the brunt of winter weather, with low temperatures plunging to 9.2°C (48.6°F), the least daylight hours at 8.3, and high wind speed peaking at 36km/h (22.4mph). Rainfall stays consistent during these months, ranging between 63mm (2.48") to 70mm (2.76"). Despite January being the coldest month, snowfall is almost non-existent, with just 2mm (0.08") recorded in this period.Weather in January
The year in Calais, Guernsey begins with January characterized by cool temperatures, with frequent rainfall signifying a wet start to the year. The lowest average temperature falls at 7.8°C (46°F) while the highest stands at 9.8°C (49.6°F). Weather in January »Weather in February
February's weather sees a slight dip in temperature compared to January, with temperatures hovering from 7°C (44.6°F) to 9.2°C (48.6°F). Snowfall is virtually unheard of this month, amounting to a total snowfall of 0mm (0"). Weather in February »Weather in March
Stepping into March, one can observe the weather takes a slightly optimistic role in Calais, Guernsey. Comparatively, March offers a respite from the fierce wind gusts felt in February, with wind gusts peaking at 44.4km/h (27.6mph). Weather in March »Weather in April
In contrast to March's weather, April brings an apparent shift towards Calais' spring-season weather pattern. Temperatures continue to rise, with an average high of 11°C (51.8°F) and a low of 8.9°C (48°F). The total rainfall shrinks further to reach 32mm (1.26") over the span of 13.3 days, making April significantly drier compared to the previous months. Weather in April »Weather in May
Weather in May represents a genuine transition into the warm season in Calais, Guernsey. Temperatures rise to an average high of 12.8°C (55°F) and a low of 10.6°C (51.1°F), indicating steadily warming conditions. An increase in sunlight exposure to 15.4 hours per day coupled with notable sunshine duration of 9.1 hours make May the month with the longest sunlight hours yet. Weather in May »Weather in June
Calais' weather in June is characterized by the arrival of summer, bringing along warmly pleasant temperatures. With a slightly increased average monthly rainfall of 33mm (1.3") from May's 27mm (1.06"), the city is privy to nature’s perfect balance of sunshine and rain. Weather in June »Weather in July
July is celebrated as the warmest month of the year in Calais, with average temperatures soaring to a high of 16.9°C (62.4°F). However, it is also the driest month, experiencing low precipitation of 26mm (1.02") over 12.8 days. The city enjoys longer sunshine hours of 9.7 per day, outshining the previous high of June. Weather in July »Weather in August
Following July's heat, August sees a slight rise in temperature to an average high of 17.8°C (64°F). Humidity levels hit a little high at 82%, but the weather remains comfortable due to a refreshing sea breeze blowing at 34.3km/h (21.3mph) gusts. Weather in August »Weather in September
With the arrival of September, Calais, Guernsey starts feeling the gradual shift towards autumn. A dip is noticed in the temperature, marking the onset of a cooler climate with temperature averaging between 15.4°C (59.7°F) and 17.2°C (63°F). Weather in September »Weather in October
Calais weather in October certainly announces the arrival of autumn. The cooling trend continues, with the average high and low temperatures falling to 15.5°C (59.9°F) and 13.6°C (56.5°F) respectively. Rainfall sees a significant upturn, amounting to 58mm (2.28"), heralding the beginning of the wetter season. Weather in October »Weather in November
November brings Calais closer to the onset of winter, with the temperature dropping further to fluctuate between 10.9°C (51.6°F) and 13°C (55.4°F). Wind gusts peak at 47.9km/h (29.8mph), bringing a noticeable chill to the weather. Weather in November »Weather in December
Concluding the year, December's weather in Calais, Guernsey embodies the full onset of winter. The temperature range narrows, averaging between 9.2°C (48.6°F) and 11.1°C (52°F). A combined effect of high precipitation, recorded as 70mm (2.76"), and lofty wind speeds reaching maximum gusts of 49.8km/h (30.9mph) keeps the wintry feel alive. Weather in December »Updated: Feb 9, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Throughout the year, in Calais, Guernsey, there are 196.3 rainfall days, and 557mm (21.93") of precipitation is accumulated.
The only month with snowfall in Calais, Guernsey, is January.
The month with the most snowfall in Calais, Guernsey, is January, when snow falls for 0.3 days and typically aggregates up to 2mm (0.08") of snow.
Throughout the year, in Calais, there are 0.5 snowfall days, and 2mm (0.08") of snow is accumulated.
The months with the least sunshine are January, November and December, with an average of 3.9h of sunshine.
Calais's February weather, marked by an average high temperature of 9.2°C (48.6°F) and an average low temperature of 7°C (44.6°F), is the coldest in the year.
February through December are months without snowfall in Calais, Guernsey.
With an average maximum UV index of 2, February is the month with the lowest UV index.
June and July, with an average relative humidity of 84%, are most humid months.
The month with the longest days is June, with an average of 16h and 12min of daylight.
July is the month with the least rainfall. Rain falls for 12.8 days and accumulates 26mm (1.02") of precipitation.
With an average of 9.7h of sunshine, July has the most sunshine of the year.
July through September, with an average maximum UV index of 5, are months with the highest UV index.
Temperature readings in Calais, Guernsey, reach their annual highs in August, averaging 17.8°C (64°F) and a minimum average of 15.8°C (60.4°F).
On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends in Calais, Guernsey, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 01:00, and the time zone reverts from GMT to BST.
The months with the lowest humidity are November and December, with an average relative humidity of 77%.
November is the month with the most rainfall in Calais, Guernsey. Rain falls for 22.8 days and accumulates 87mm (3.43") of precipitation.
The month with the shortest days in Calais is December, with an average of 8h and 18min of daylight.
Average temperature
Calais, Guernsey
The warmest month (with the highest average high temperature) is August (17.8°C).
The month with the lowest average high temperature is February (9.2°C).
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (7°C).
Average pressure
Calais, Guernsey
- Average pressure in January:
1016.1mbar - Average pressure in February:
1015.2mbar - Average pressure in March:
1016.2mbar - Average pressure in April:
1015.6mbar - Average pressure in May:
1017.4mbar - Average pressure in June:
1016.9mbar
- Average pressure in July:
1016.7mbar - Average pressure in August:
1016.4mbar - Average pressure in September:
1017.9mbar - Average pressure in October:
1015.7mbar - Average pressure in November:
1011.5mbar - Average pressure in December:
1016.5mbar
The month with the highest atmospheric pressure is September (1017.9mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).
Average wind speed
Calais, Guernsey
- Average wind speed in January:
34.1km/h - Average wind speed in February:
34km/h - Average wind speed in March:
30.3km/h - Average wind speed in April:
25km/h - Average wind speed in May:
23.7km/h - Average wind speed in June:
22.8km/h
- Average wind speed in July:
21.9km/h - Average wind speed in August:
22.8km/h - Average wind speed in September:
25.8km/h - Average wind speed in October:
29.1km/h - Average wind speed in November:
34.8km/h - Average wind speed in December:
36km/h
The windiest month (with the highest average wind speed) is December (36km/h).
The calmest month (with the lowest average wind speed) is July (21.9km/h).
Average humidity
Calais, Guernsey
The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are November and December (77%).
Average rainfall
Calais, Guernsey
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).
Average rainfall days
Calais, Guernsey
- Average rainfall days in January:
22 days - Average rainfall days in February:
17.7 days - Average rainfall days in March:
17 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
11.8 days - Average rainfall days in June:
11.5 days
- Average rainfall days in July:
12.8 days - Average rainfall days in August:
14 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
18.5 days - Average rainfall days in November:
22.8 days - Average rainfall days in December:
21.4 days
The month with the highest number of rainy days is November (22.8 days).
The month with the least rainy days is June (11.5 days).
Average snowfall
Calais, Guernsey
The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days
Calais, Guernsey
- Average snowfall days in January:
0.3 days - Average snowfall days in February:
0.2 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight / Average sunshine
Calais, Guernsey
- Average daylight in January:
8h and 42min - Average daylight in February:
10h and 12min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 48min - Average daylight in May:
15h and 24min - Average daylight in June:
16h and 12min
- Average daylight in July:
15h and 48min - Average daylight in August:
14h and 24min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 6min - Average daylight in December:
8h and 18min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in January:
3h and 54min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 12min - Average sunshine in April:
9h and 6min - Average sunshine in May:
9h and 6min - Average sunshine in June:
9h and 6min
- Average sunshine in July:
9h and 42min - Average sunshine in August:
9h and 12min - Average sunshine in September:
8h and 24min - Average sunshine in October:
4h and 54min - Average sunshine in November:
3h and 54min - Average sunshine in December:
3h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January, November and December (Average sunshine: 3h and 54min).
Average sunshine days
Calais, Guernsey
- Average sunshine days in January:
5.5 days - Average sunshine days in February:
6.9 days - Average sunshine days in March:
10.7 days - Average sunshine days in April:
14.8 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
16 days
- Average sunshine days in July:
15.4 days - Average sunshine days in August:
12.1 days - Average sunshine days in September:
13.1 days - Average sunshine days in October:
8.6 days - Average sunshine days in November:
4 days - Average sunshine days in December:
5.3 days
The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is November (4 days).
Average UV index
Calais, Guernsey
The months with the highest UV index are July, August and September (UV index 5).
The month with the lowest UV index is February (UV index 2).
Average cloud cover
Calais, Guernsey
The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility
Calais, Guernsey
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
