Is This Weather Normal? – May 2019

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May 2019 in Terrace, BC was hot and dry:

  • Record tying heat
  • Much drier than average

Temperature:

The average May 2019 temperature of 14.2°C is tied with 2015 for the highest average temperature for the month, 3.8°C warmer than the 1971-2000 baseline climate. Average daily temperatures stayed above average for the entire month with some days at the beginning and end of the month approaching daily records (Fig. 1).

Figure 1: Daily average temperature for May 2019 in Terrace, BC (dotted red line). The solid red line shows January-April 2019 temperature. The black line shows the 1971-2000 average. The two gray lines show plus/minus one standard deviation.

The temperature pattern for the year shows an interesting stair-step pattern, as we have switched from one pattern of atmospheric circulation to another almost on a monthly basis (Fig. 1). This has led to well above average temperatures in January and May, well below average temperatures in February, and near average temperatures in March and April (Fig. 2).

Figure 2: 2019 average monthly temperature for Terrace, BC through May. The dotted blue curve is 2019, the 10 red lines are the ten warmest years on record, every other year is in gray. The black line is the long-term average, and the error bars mark plus/minus one standard deviation.

Precipitation:

May 2019 precipitation totaled 19mm, 39mm below the 1971-2000 average, which is the 7th driest May on record. After a return to average precipitation for April, conditions returned to significantly drier than average in May. Precipitation for the year to date totals 328mm, 66% of normal (Fig. 3).

Figure 3: Cumulative precipitation – where total precipitation (green), rain (dark blue), and snow (light blue) are added throughout the year. Solid lines show the 1971-2000 average. Dotted lines show the 2019 totals to date.

Check back in early-July for the June update and a half-way-through-2019 synopsis!

 

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