The pear trees are already blooming in Celeste Cantú’s garden. She usually sees the blossoms appear in late February, but this winter’s extreme warmth triggered the bloom a full month early. As the thermometer hit 80 degrees in her garden, she snapped a photo of the blossoms and posted it on Facebook with the question: “Do you think the three weeks of winter are over in So Ca?” A winter heat wave has settled over the Southwest and is bringing record-high temperatures to parts of Southern California, along with dry, gusty winds that have prompted warnings of fire danger.