custom location - Weather History and Averages

• Latitude: 34.1
• Longitude: -117.783

High Temperatures

On average, the day with the warmest high temperature in custom location is September 5 at an average of 92.3 °F (33.5 °C).

On average, the day with the coldest high temperature in custom location is December 29 at an average of 63.9 °F (17.7 °C).

Records

The warmest recorded high temperature in custom location was 120.9 °F (49.4 °C) on June 25 in the year 1974 at ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — Weather Bureau Army Navy (WBAN): 93180 .

The coldest recorded high temperature in custom location was 23.0 °F (-5.0 °C) on December 25 in the year 1987 at MOUNT WILSON — Integrated Surface Dataset (ISD) station ID: 722890 — Weather Bureau Army Navy (WBAN): 93136 .

Low Temperatures

On average, the day with the warmest low temperature in custom location is July 31 at an average of 65.0 °F (18.3 °C).

On average, the day with the coldest low temperature in custom location is December 26 at an average of 41.3 °F (5.2 °C).

Records

The warmest recorded low temperature in custom location was 105.1 °F (40.6 °C) on September 1 in the year 1987 at ONTARIO — Integrated Surface Dataset (ISD) station ID: 722865 — Weather Bureau Army Navy (WBAN): 93180 .

The coldest recorded low temperature in custom location was 0.1 °F (-17.7 °C) on December 17 in the year 1979 at MOUNT WILSON — Integrated Surface Dataset (ISD) station ID: 722890 — Weather Bureau Army Navy (WBAN): 93136 .

Freeze

When you are gardening in custom location, consider the chance that the weather may freeze and harm your plants. There is a greater than 5% chance of temperatures dropping below freezing in 15 of 366 days per year in custom location.

According to the USA National Weather Service:

Freeze occurs when the temperature drops to 32° Fahrenheit or lower. A freeze will result in significant damage to many unprotected plants, especially if the temperature remains at-or-below freezing for several hours.

Last freeze

In custom location during the spring season, the average last freeze date is January 6. Expect^* the last freeze date after

• January 31 in one of every two years (50%),
• March 7 in one of every ten years (10%),
• March 19 in one of every twenty years (5%),
• April 8 in one of every hundred years (1%).

First freeze

In custom location during the autumn (fall) season, the average first freeze date is December 22. Expect^* the first freeze date before

• December 19 in one of every two years (50%),
• November 25 in one of every ten years (10%),
• November 19 in one of every twenty years (5%),
• November 6 in one of every hundred years (1%).

Hard Freeze

According to the USA National Weather Service:

Hard freeze typically occurs when the temperature reaches 28° Fahrenheit or lower for at least an hour (or more). This usually means that most seasonal vegetation will be destroyed. In addition, there is a possibility of damage to unprotected outdoor plumbing/un-drained sprinkler systems etc.

Last hard freeze

In custom location during the spring season, the average last hard freeze date is no freezing temperatures all season. Expect^* the last hard freeze date after

• No freezing temperatures all season in one of every two years (50%),
• January 30 in one of every ten years (10%),
• February 12 in one of every twenty years (5%),
• March 6 in one of every hundred years (1%).

First hard freeze

In custom location during the autumn (fall) season, the average first hard freeze date is no freezing temperatures all season. Expect^* the first hard freeze date before

• No hard freeze temperatures all season in one of every two years (50%),
• December 17 in one of every ten years (10%),
• December 10 in one of every twenty years (5%),
• November 22 in one of every hundred years (1%).

Frost

Frost can happen at temperatures above freezing and damage delicate plants. According to the USA National Weather Service:

Frost occurs when there is a solid deposition of water vapor from the air. Frost will form when solid surfaces are cooled below the dew point. An air temperature range of 33°- 36° Fahrenheit (or colder), along with light winds, is usually needed to initiate frost formation. At least minor damage is possible to plants. One must keep in mind that frost is not guaranteed if the air is very dry and/or winds are roughly 8+ MPH.

Last frost

In custom location during the spring season, the average last frost date is March 12. Expect^* the last frost date after

• March 11 in one of every two years (50%),
• April 9 in one of every ten years (10%),
• April 16 in one of every twenty years (5%),
• April 27 in one of every hundred years (1%).

First frost

In custom location during the autumn (fall) season, the average frost date is November 28. Expect^* the first frost date before

• November 28 in one of every two years (50%),
• November 11 in one of every ten years (10%),
• November 4 in one of every twenty years (5%),
• October 30 in one of every hundred years (1%).

Details

If you would like to see the temperatures for specific days, you can click on the corresponding links below: