Weather and climate in Mount Shasta (California)

The climate of Mount Shasta is moderately continental, with cold, rainy winters (and snowy as well), and sunny summers, which are hot during the day, but with cool nights.
Mount Shasta is a small town located in northern California, at the foot of the mountain of the same name, and at 1,100 meters (3,600 ft) above sea level.
On the coldest nights of the year, the temperature can drop below -10 °C (14 °F). In December 2013, it dropped to -17 °C (1.5 °F), and in December 1990, to -21.6 °C (-7 °F). In a year, 260 cm (102 in) of snow fall, from November to April. Snowfalls are therefore abundant, even if the snow rarely lasts long, because the daytime temperature generally exceeds freezing.
In summer, there are strong temperature differences between night and day, so it can be cold at night and hot during the day. On the hottest days of the year, the temperature generally reaches 38 °C (100.5 °F).
The average temperature of the coldest month (December) is of 1.6 °C (34.9 °F), that of the warmest month (July) is of 20.2 °C (68.4 °F). Here are the average temperatures.

Precipitation amounts to 955 millimeters (37.6 inches) per year: so, it is at an intermediate level. It ranges from 5 mm (0.2 in) in the driest months (July, August) to 170 mm (6.7 in) in the wettest (December). Here is the average precipitation.

Best Time

The best time to visit Mount Shasta is from June to September, as it is the warmest and sunniest period. It must be said that it can be very hot during the day.
Mount Shasta, which gives its name to the city, is located in the southern part of the Cascade chain, it is 4,316 meters (14,161 ft) high and is clearly visible even at a great distance. The mountain receives heavy snow, especially in winter, for a total of 12 and a half meters (41 feet) of snow per year. The summit remains snow-capped even in summer. In general it is preferable to climb the mountain from April to September, when the days are longer and the temperature is higher, choosing, in any case, days with good weather and high pressure.

Back to California.

Mount Shasta - Weather by month

Based on the period 1991-2020

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January is generally a cold month. The average temperature is of 2.4 °C (36 °F), with a minimum of -1.9 °C (28.6 °F) and a maximum of 6.8 °C (44.2 °F).
On the coldest nights of the month, the temperature usually drops to around -9 °C (15.5 °F). However, it dropped to -16.1 °C (3 °F) in January 2017.
On the warmest days of the month, the temperature usually reaches around 14.5 °C (58.5 °F). However, it reached 21 °C (69.8 °F) in January 1997.
Precipitation amounts to 160 mm (6.3 in), distributed over 12 days.
The day lasts on average 9 hours and 35 minutes.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

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February is generally a cold month. The average temperature is of 3.4 °C (38 °F), with a minimum of -1.6 °C (29.2 °F) and a maximum of 8.4 °C (47.1 °F).
On the coldest nights of the month, the temperature usually drops to around -8 °C (18 °F). However, it dropped to -12.8 °C (9 °F) in February 1993.
On the warmest days of the month, the temperature usually reaches around 17 °C (62.5 °F). However, it reached 21.1 °C (70 °F) in February 1992.
Precipitation amounts to 165 mm (6.5 in), distributed over 12 days.
The day lasts on average 10 hours and 40 minutes.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

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March is generally a quite cold month. The average temperature is of 5.7 °C (42 °F), with a minimum of -0.1 °C (31.9 °F) and a maximum of 11.4 °C (52.5 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -6 °C (21 °F). However, it dropped to -9.4 °C (15.1 °F) in March 2002.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 20.5 °C (69 °F). However, it reached 25 °C (77 °F) in March 2003.
Precipitation amounts to 140 mm (5.5 in), distributed over 13 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 66%.
The average wind speed is 6 kph (4 mph).

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April is generally a quite mild month. However, there are remarkable differences between night and day. The average temperature is of 8.3 °C (47 °F), with a minimum of 1.6 °C (34.9 °F) and a maximum of 15 °C (59 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -3.5 °C (25.5 °F). However, it dropped to -8 °C (17.6 °F) in April 2008.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 25 °C (77 °F). However, it reached 30.6 °C (87.1 °F) in April 2009.
Precipitation amounts to 75 mm (3 in), distributed over 11 days.
The day lasts on average 13 hours and 25 minutes.
The average humidity is 59%.
The average wind speed is 6 kph (4 mph).

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May is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of 12.7 °C (55 °F), with a minimum of 5 °C (41 °F) and a maximum of 20.4 °C (68.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -0.5 °C (31 °F). However, it dropped to -3 °C (26.6 °F) in May 1999.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 30 °C (86 °F). However, it reached 35 °C (95 °F) in May 2008.
Precipitation amounts to 55 mm (2.2 in), distributed over 8 days.
The day lasts on average 14 hours and 35 minutes. So the days are long.
The average humidity is 54%.
The average wind speed is 6 kph (4 mph).

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June is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of 16.4 °C (62 °F), with a minimum of 8.4 °C (47.1 °F) and a maximum of 24.5 °C (76.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 2.5 °C (37 °F). However, it dropped to -0.6 °C (30.9 °F) in June 2017.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 33 °C (91.5 °F). However, it reached 37.2 °C (99 °F) in June 2013.
Precipitation amounts to 30 mm (1.2 in), distributed over 4 days.
The day lasts on average 15 hours and 5 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
The average humidity is 50%.
The average wind speed is 6 kph (4 mph).

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July, the warmest month of the year, is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of 20.2 °C (68 °F), with a minimum of 10.9 °C (51.7 °F) and a maximum of 29.6 °C (85.2 °F).
On the coldest nights of the month, the temperature usually drops to around 6.5 °C (43.5 °F). However, it dropped to 3 °C (37.4 °F) in July 1997.
On the warmest days of the month, the temperature usually reaches around 35.5 °C (96.5 °F). However, it reached 38.9 °C (102 °F) in July 2016.
Precipitation amounts to only 5 mm (0.2 in), distributed over 2 days.
The day lasts on average 14 hours and 50 minutes. So the days are long.
The average humidity is 45%.
The average wind speed is 4 kph (3 mph).

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August is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of 19.6 °C (67 °F), with a minimum of 9.9 °C (49.9 °F) and a maximum of 29.2 °C (84.6 °F).
On the coldest nights of the month, the temperature usually drops to around 5.5 °C (42 °F). However, it dropped to 2.8 °C (37 °F) in August 2002.
On the warmest days of the month, the temperature usually reaches around 35 °C (95.5 °F). However, it reached 38.3 °C (100.9 °F) in August 2017.
Precipitation amounts to only 5 mm (0.2 in), distributed over 2 days.
The day lasts on average 13 hours and 40 minutes.
The average humidity is 44%.
The average wind speed is 4 kph (2 mph).

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September is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of 16.4 °C (62 °F), with a minimum of 7 °C (44.6 °F) and a maximum of 25.8 °C (78.4 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 2 °C (35.5 °F). However, it dropped to -1.1 °C (30 °F) in September 2005.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 33 °C (91.5 °F). However, it reached 38.3 °C (100.9 °F) in September 2017.
Precipitation amounts to 15 mm (0.6 in), distributed over 3 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 47%.
The average wind speed is 4 kph (3 mph).

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October is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of 10.6 °C (51 °F), with a minimum of 3.1 °C (37.5 °F) and a maximum of 18.2 °C (64.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -3 °C (27 °F). However, it dropped to -8.3 °C (17.1 °F) in October 2019.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 28 °C (82 °F). However, it reached 31.7 °C (89.1 °F) in October 2015.
Precipitation amounts to 50 mm (2 in), distributed over 6 days.
The day lasts on average 11 hours and 0 minutes.
The average humidity is 58%.
The average wind speed is 5 kph (3 mph).

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November is generally a quite cold month. The average temperature is of 5.0 °C (41 °F), with a minimum of -0.3 °C (31.4 °F) and a maximum of 10.3 °C (50.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -7 °C (19 °F). However, it dropped to -11.7 °C (10.9 °F) in November 1993.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 20 °C (68.5 °F). However, it reached 25.6 °C (78.1 °F) in November 2020.
Precipitation amounts to 90 mm (3.5 in), distributed over 10 days.
The day lasts on average 9 hours and 50 minutes.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).

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December, the coldest month of the year, is generally a cold month. The average temperature is of 1.6 °C (35 °F), with a minimum of -2.4 °C (27.6 °F) and a maximum of 5.6 °C (42.1 °F).
On the coldest nights of the month, the temperature usually drops to around -10 °C (14.5 °F). However, it dropped to -18 °C (-0.4 °F) in December 1998.
On the warmest days of the month, the temperature usually reaches around 13.5 °C (56 °F). However, it reached 17.2 °C (63 °F) in December 2013.
Precipitation amounts to 170 mm (6.7 in), distributed over 13 days.
The day lasts on average 9 hours and 10 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 5 kph (3 mph).