calgarylens
live record51.0447°N · 114.0719°Walt 1045 m
file 02topic · climate13 directives9 figures
last updated · 2026.04

Calgary’s climate emergency,
what it actually did.

On 15 November 2021, Calgary City Council declared a climate emergency. Four years later, a motion to rescind it was defeated 4-10. This case file walks through what the declaration directed, what got built, what it cost, and who actually paid.

climate · case filecity tax-base share
$2.20
/person
Recurring annual cost to every Calgarian, fully-ramped 2026.($3.52M/yr citywide)
grants secured
$602M
Federal + provincial money brought in 2023→2026.(non-repayable)
city contribution
$137M
Calgary capital + one-time operating + city-reserve cash for the same window — 4.4× leverage.(non-loan, 4-year cash)
per-capita GHG
−31.9%
Community emissions per resident vs. the 2005 baseline.(2005 → 2022)
[09.A]

Calgary's future climate, by the numbers

avg temp · 2050s
+3°C
From a current annual average of 5°C to 8°C. → +5°C by the 2080s.(Figure 3, p.4)
heavy rainfall · 2050s
+28%
Increase in heavy rainfall by the 2050s vs the 1981–2010 baseline. → +52% by the 2080s.(Figure 3, p.4)
thunderstorms · 2050s
+54%
Increase in annual thunderstorms — more atmospheric energy is available for severe storms. → +77% by the 2080s.(Figure 3, p.4)
growing season · 2050s
+22%
Longer growing season — earlier springs, later falls, shorter winters. → +37% by the 2080s.(Figure 3, p.4)
How to read: each headline is a 30-year average around the 2050s or 2080s vs the 1981–2010 baseline, on the City’s planning trajectory of high emissions. The underlying ensemble differs by hazard (temperature and heat use a 27-model CMIP5 ensemble; rainfall and storms use a wider 30-model setup with different downscaling) — see each section below.
[09.B]

Annual average daily air temperature

2°C4°C6°C8°C10°C12°C14°CP90 9.5P10 6.0P90 12.1P10 7.64.5°C7.7°C9.8°C1981–20102050s (2041–70)2080s (2071–2100)+3.2°C vs baseline+5.3°C vs baseline
Calgary’s annual average sits well above historical levels by the 2050s and continues climbing through the 2080s. Bands span the 10th–90th percentile across 27 climate models; line is the median. Future periods are 30-year averages centred on the 2050s and 2080s, on the high-emissions trajectory climate scientists use as a planning stress-test (RCP8.5 — the “business-as-usual” greenhouse-gas pathway).
[09.C]

The hot summers Calgary already gets are the 2050s' cool ones

6.81981–2010 baseline15.22050s low end48.12080s typicalhot days/yr19902025days at YYC with max ≥29°C · ArcGIS Layer 5 · projections Table 12 (p.13)
Projections are 2050s/2080s 30-year averages vs the 1981–2010 baseline · 10th–90th percentile across 27 climate models · high-emissions trajectory (RCP8.5).

The same shift shows up in nights and heat-wave length: tropical nights (≥20°C overnight) go from essentially zero historically (0/yr) to 4.7/yr by the 2080s, and the median heat-wave runs 11 days up from 0.5. (Tables 14, 11.)

[09.D]

Calgary's drainage was built for a storm that's not rare anymore

53.22050s 100-yr63.22080s 100-yr41.6today 100-yrHistorical (1981–2010) baselinemm/hr19902024annual peak 1-hour intensity, any gauge in the city’s monitoring network · ArcGIS Layer 7
Threshold projections (2050s, 2080s) come from a wider 30-model ensemble that includes 16 NA-CORDEX regionally-downscaled runs spanning both moderate and high-emissions trajectories (RCP4.5 + RCP8.5); short-duration intensities are scaled via Clausius-Clapeyron (~7%/°C of warming, Trenberth 2011). This is a different methodology than the temperature, heat, and drought sections.
[09.E]

Same dry spells. The water just leaves faster.

evapotranspiration (mm/yr)dry spells (count/yr)1001981–2010 baseline1981–20102050s2080s872mm/yr5.9/yr956mm/yr · +10%6.0/yr1007mm/yr · +15%6.0/yrPenman-Monteith evapotranspiration · dry spells = ≥14 consecutive dry days · indexed to the 1981–2010 ECCC airport baseline
Projections are 2050s/2080s 30-year averages vs the 1981–2010 baseline · 10th–90th percentile across 27 climate models · high-emissions trajectory (RCP8.5).
“Calgary's water supply, which comes from the Bow and Elbow river source watersheds, is reliant on mountain snowpack, precipitation and glacial runoff. River flows are usually high during the spring run-off period, which typically starts in May and ends in mid-July; followed by a steady decrease in flows occurring in summer and early fall (COC, 2020). With climate change bringing shorter, warmer winters, earlier spring, longer summers and later fall, the Bow and Elbow rivers will experience a shift in runoff seasonality (COC, 2021). The mountain snow-pack will be smaller and will melt earlier in the year and summer base flows may be less enhanced by glacial runoff. These conditions will result in lower flows and decreased water quality for the Bow and Elbow rivers amidst drier, longer and hotter summers.”
§2.3.6 Long-term drought, p.23
[09.F]

Severe storms — observed smoke, projected convection

0100200300400500600hours/year1990-present mean · 73 hr/yr19902025wildfire-smoke hours observed at YYC · ArcGIS Layer 12
convective events · 2080s
40/yr
Up from a 1981–2010 baseline of 23/yr at the airport. P10–P90: 25–49 days.(Table 28 (p.25))
convective conditions · 2080s
87/yr
Days the weather-typing model considers favourable for convection — up from 45/yr historically. P10–P90: 41–117 days.(Table 28 (p.25))
convective season · 2080s
+77%
Median across 30 GCMs of the increase in potential convective precipitation days. By the 2050s the same number is +55%. Season window: May–Sept → April–Oct (2050s) → March–Oct (2080s).(§2.3.8 (p.25))
Convective-storm conditions roughly double by the 2080s — though the underlying method is a weather-typing model, not direct simulation, which is why this section sits at lower confidence than heat or temperature. Convective projections (2080s vs 1981–2010) take the median across 30 climate models on the high-emissions trajectory (RCP8.5).
“Historically, convective precipitation at the Calgary International Airport occurs from May to September. However, in the 2050s and 2080s, the convective season is projected to be longer, from April to October and March through October, respectively. In the 2080s, the possibility extends from March through October, due to the temperature increase. All months from April through October (2050s) and March through October (2080s) may see an increase in potential convective precipitation days. As presented in Figure 14 and Table 28, as the climate continues to warm, the season for conditions favourable for the development of conditions and events will lengthen. Annually, the occurrence of potential convective precipitation days in Calgary is projected to increase by approximately 55% in the 2050s and 77% in the 2080s (considering the median of the 30 GCMs).”
§2.3.8 Severe Storms, p.25
on hail — what the report can and can’t say

“Although hail cannot be explicitly modeled by global and regional climate model due to limitations in resolution, large hail events are projected to increase with the hail stones increasing in size, due to increasing atmospheric energy. Conversely, smaller hail events are expected to decrease due to a rising melting level in a warming atmosphere (Brimelow, 2017). Further, the longer convective storm season (Figure 14) will likely contribute to Calgary experiencing more hail events (Etkin, 2018).”

§2.3.8 Hail, p.26

Confidence caveat (§1.3.4)— Calgary’s own report describes its convective-storm projections as the lowest-confidence tier of any hazard analysed, citing “considerable uncertainties due to the inability of climate models to resolve and parameterize small-scale and convective processes.” The smoke series above is direct observation; the 55%/77% figures are weather-type modelling, not direct simulation.