What 2019’s Hottest June Ever Recorded Says About the Climate Crisis

Hint — It’s accelerating.


To be a climate scientist, to read the science, or to otherwise track today’s unfolding global disaster brought on by fossil fuel burning, is to witness a historical event beyond the scope anything encountered by human civilization.

(July 14th’s record low Arctic sea ice ringed by far northern wildfires and related smoke plumes is just one signal of a rapidly heating global climate. Image source: NASA Worldview.)

Over the past Century, heat trapping pollution has forced the world to warm by about 1.1 degrees Celsius. That’s 1/4 the difference between what humans are used to and an ice age — but on the side of hot. Seas, swollen by this heat and by thawing glaciers, have risen by an average of about 17 centimeters since 1900. Nine trillion tons of ice — the equivalent to 9,000 mountains — have melted from those glaciers into our oceans. Wildfires in the U.S. now burn twice the number of acres as they did 30 years ago. Flood events are more than twice as frequent as during the 1980s. Strong hurricanes have doubled in frequency in the North Atlantic over a similar period. The Arctic’s sea ice is in full retreat.

And if we continue burning fossil fuels, this is just the beginning.

June of 2019 was the hottest June ever recorded in the 139 year global climate record provided by NASA. It was about 1.15 C hotter than 1880s averages and exceeded the past hottest June — 2016 — by a full 0.11 C margin. In climate terms, this was a big jump upward.

(Distribution of hotter and colder than average temperatures shows most of the globe sweltering under greenhouse gas induced heating. In particular, the Arctic has been hit quite hard in the most recent round of extreme temperatures. Image source: NASA GISS.)

Perhaps more importantly to the larger trend, the first half of 2019 was the second hottest first six month period on record. Meanwhile, 2019’s heat comes in the context of the past five years. All were one of the five hottest years ever recorded. And NASA GISS head Dr. Gavin Schmidt’s projection is pointing toward a potential second hottest 2019 as well. Dr. Schmidt stated as much to the Guardian, saying:

“It is clear that 2019 is shaping up to be a top-five year – but depending on what happens it could be second, third or fourth warmest. The warmest year was 2016, which started with a big El Niño, which we didn’t have this year, so a record year is not particularly likely.”

With the global climate system so large and subject to swings (produced mainly by El Nino and La Nina), consecutive hot years are a signal of accelerating global heating. A trend born out by NASA’s global temperature record. In the 1990s, decadal temperatures averaged around 0.61 C above 1880s readings. The 2000s — 0.8 C hotter. The 2010s thus far — 1.08C hotter. In other words, the global heat gain from the 1990s to the 2000s was approximately 0.19 C while the heat gain so far from the 2000s to the 2010s is about 0.28 C. A near doubling of past 0.15 C decadal temperature increases.

(Record hot July may follow record hot June…)

This apparently accelerating global heating is driven by rising atmospheric greenhouse gas concentrations. Dr Michael E. Mann noted to Mashable today:

“As we have shown in recent work, the record warm streaks we’ve seen in recent years simply cannot be explained without accounting for the profound impact we are having on the planet through the burning of fossil fuels and the resulting increase in atmospheric greenhouse gas concentrations.”

Carbon dioxide, which is the primary driver of heat gain, is now at around 411 parts per million37 percent higher than during any period in the last 800,000 years. This level of heat trapping gas is unprecedented in human terms — likely about as high as readings seen during the Middle Miocene 15 million years ago and at least as high as those seen during the Pliocene 3 million years ago.

Methane — another very potent greenhouse gas and the second strongest overall contributor to the climate crisis — is also continuing to rise in concentration. This rise, along with increasing CO2, has been the cause of some anxiety among scientists who monitor the global climate system.

(Rising atmospheric CO2, primarily driven by fossil fuel burning, is the main driver of the global heating crisis we are now experiencing. Image source: NOAA ESRL.)

Together with other trace heat trapping gasses, the global CO2 equivalent heat forcing is around 499 ppm during 2019 (extrapolated from NOAA data). In other words, we’ll be crossing the ominous 500 ppm CO2e threshold very soon.

What all this data means is that we have now turned the ratchet of climate crisis at least once. A set of serious impacts are now locked in. Indeed, we are seeing them. But if we keep burning fossil fuels and turn the ratchet again, it gets much worse from here on out.

(Want to help fight the climate crisis by transitioning to a clean energy vehicle? Get 1,000 free supercharger miles at this link.)

Global Heat Leaves 20th Century Temps ‘Far Behind’ — June Another Hottest Month on Record

We’ve left the 20th century far behind. This is a big deal. — Deke Arndt, head of NOAA’s National Centers for Environmental Information


One of the top three strongest El Ninos on record is now little more than a memory. According to NOAA, sea surface temperatures (SSTs) in the Central Equatorial Pacific hit a range more typical to La Nina conditions last week. This cool-pool formation follows a June in which ocean surfaces in this zone had fallen into temperatures below the normal range.

El Nino Gone

(El Nino had faded away by June and turned toward La Nina-level temperatures by late June and early July. Despite this Equatorial Pacific cooling, June of 2016 was still the hottest June on record. Image source: NOAA.)

But despite this natural-variability related cooling of the Equatorial Pacific into below-normal ranges, the globe as a whole continued to warm relative to previous June temperatures. According to NASA, last month was the hottest June in the global climate record.

NASA figures show the month was 0.79 degrees Celsius warmer than the 20th century baseline (1951 to 1980) average, edging out June of 2015 (when El Nino was still ramping up) by just 0.01 degree C to take the dubious position of the new hottest June ever recorded by human instruments. June 2016 was also about 1.01 C hotter than temperatures in the 1880s, at the start of NASA’s global climate record.

January to June — Anomalous Warmth Centers Over Arctic

June marks the 9th consecutive hottest month on record in the NASA data. In other words, on a month-to-month comparison, each month since October of 2015 was the new hottest of those months ever recorded. In addition, the six-month 2016 climate year period of January to June showed an average global temperature of about 1.31 C above 1880s averages — perilously close to the 1.5 degree C global climate threshold.

Record warm Earth

(Arctic heat dominated the first half of 2016 which is likely to end up being the hottest year ever recorded in the global climate record. Image source: Berkeley Earth.)

Distribution of this anomalous heat during this six-month period, despite the Equatorial warming pulse related to El Nino, was focused on the Arctic, as we can see in this Berkeley Earth graphical composite of the NASA temperature series above.

Warmest temperature anomalies for the period appear above the Barents and Greenland Seas boundaries with the Arctic Ocean and approach 12 C for the six-month period. During this period, this region has hosted numerous warm-wind invasions of the Arctic from the south. A second, similar slot of warm south-to-north air progression appears over Alaska.

Record June Warmth Most Apparent at Northern Continental Margins

During June, the Arctic as a whole remained much warmer than average, with the region from latitudes 80° to 90° North seeing a +0.8 C temperature departure in the NASA measure. The highest anomaly regions globally, however, were near the continental margins bordering the Arctic Ocean in the region of latitudes 70° to 75° North. Here temperatures ranged near 2 C above average.

June Zonal Anomalies

(According to NASA’s zonal anomaly measure, the northern continental margins showed the highest temperature anomalies globally. Image source: NASA GISS.)

Some parts of this region were particularly hot. These included the region of Russian Siberia near the Yamal Peninsula, which saw 4-8 C above average temperatures for the month, the Bering Sea and Northeastern Siberian region adjacent which saw 2-8 C above average temperatures, and the Canadian Archipelago which saw 2-4 C above average temperatures for the month.

Odd Warm-Air Slot Runs from Equator to West Antarctic Peninsula

Notable is that visible warm-air slots running from Tropics to Pole appear to remain intact in the Northeastern Pacific and over Central Asia in the Northern Hemisphere during early Summer. Meanwhile, an odd Southern Hemisphere warm-air slot appears to have developed during June in the region of the Southeastern Pacific.

June of 2016 Anomaly Map

(June of 2016 was the hottest June on record. This is what the anomaly map looked like. Image source: NASA GISS.)

This particular Equator-to-Pole heat transfer appears to have run as far south as the West Antarctic Peninsula and assisted in producing a 4-8 C above-average temperature spike there.

As the majority of the world remained hotter than normal during June of 2016, the only noted outlier cool region was Central and Eastern Antarctica which, in spots, saw 4 to 7.1 C below-average temperatures.

2016 is Blowing All Previous Years Away

Overall, as El Nino continues to shift toward neutral or La Nina states, global temperatures should remain lower than during peak periods seen earlier this year. It’s likely that over the coming six months, the very long period of new monthly global record temperatures we’ve seen will eventually be broken by a top-five- or top-10-hottest month.

Blowing heat records away Climate Central

(2016 is on track to blow all previous record hot years out of the water. See related article here.)

However, it appears that global heat has in total taken a big step up. As such, 2016 appears to be set to average near 1.14 to 1.25 C above 1880s levels. That would beat out previous hottest year 2015 by a big margin. To this point, Deke Arndt, head of NOAA’s National Centers for Environmental Information, recently noted in The Scientific American:

“It’s important to keep perspective here. Even if we aren’t setting [monthly] records, we are in a neighborhood beyond anything we had seen before early 2015. We’ve left the 20th century far behind. This is a big deal.”

In other words, that’s about a decade’s worth of typical human-forced warming in just one year. If it shapes up that way, it basically blows all previous years out of the water. Pretty nasty to say the least.



Berkeley Earth


NOAA Also Found June 2016 to be the Hottest on Record

Japan’s Meteorological Agency Also Found June 2016 to be the Hottest on Record

First Half of 2016 Blows Away Global Temperature Records

Hat tip to Zack Labe

Hat tip to DT Lange


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