WHEAT SPECIALIST · Grain / Weather
Z4226 – [W] CHIRPS Australia Wheatbelt Rainfall (Inverted)
Dry conditions across the Western Australia and NSW wheatbelt cut Australian export supply; Australia is the world’s number-three wheat exporter.
At a glance
DORMANT · WAITING FOR MAY
Current reading
+0.891
On the plus-or-minus one scale; sign-inverted Australia wheatbelt rainfall z-score.
SEASONAL STATE
DORMANT · WAITING FOR MAY
Dormant Nov-Apr
Signal state
Extreme POS
Current state across the Australia Wet / Normal / Australia Dry regime.
Phase duration
35 sessions
Consecutive trading days in the current phase.
Sample
36 years
Daily CHIRPS rainfall aggregated across the Australian wheatbelt, 1990 onward.
As of Nov 03, 2026. Updated nightly. · NEXT WINDOW MAY 2027 GROWING SEASON
SIGNAL OVERVIEW
Australia is the world’s number-three wheat exporter, with the growing belt concentrated in Western Australia, New South Wales, and Victoria. Dry conditions during the May-October growing season (Southern Hemisphere) cut Australian yield and reduce exportable surplus, tightening Pacific-basin wheat balance and lifting futures.
This signal reads the CHIRPS (Climate Hazards Group InfraRed Precipitation with Station data) rainfall estimate aggregated across the Australian wheatbelt region, computes a rolling z-score, and sign-INVERTS so DRY conditions read as a POSITIVE composite (bullish wheat). The historical per-regime pattern is modestly directional — Australia Dry precedes forward returns above baseline, Australia Wet runs below. Pair with the NOAA ONI (ENSO) signal for the climate-driver context.
LIVE CHART
Thirty-six years of the sign-inverted CHIRPS Australia wheatbelt rainfall composite against CBOT SRW wheat forward returns.
What the chart is showing. The dark line in the top panel is the sign-inverted CHIRPS Australia wheatbelt rainfall composite on a tanh-bounded plus-or-minus one scale — positive means Australia dry (bullish wheat via Pacific-basin supply tightening), negative means Australia wet (bearish). The bronze line in the middle panel is the CBOT SRW wheat front-month in cents per bushel. The bottom panel tracks the 252-day rolling information coefficient between the composite and wheat 60-day forward returns. Dashed horizontal lines mark the plus-or-minus 0.2 moderate and plus-or-minus 0.5 extreme thresholds.
COMPOSITE
+0.891 / tanh
STATE
Extreme POS
PHASE
+1.42
SAMPLE N
9,000+ days
TODAY’S PLAYBOOK READING
STATE
Extreme Pos
STATE AND HISTORY
Composite +0.891, state Extreme POS, 35 trading days running in the current phase. Per-state baselines in the regime table below.
THE AUSTRALIA MECHANISM
The Australian wheatbelt spans Western Australia (the Esperance and Northam regions), New South Wales (Riverina), and Victoria. Growing season runs May through October under the Southern Hemisphere calendar. Rainfall deficits during the critical July-September window (equivalent to Northern Hemisphere pollination) cut yield and reduce Australia’s exportable surplus, which flows to Asia-Pacific buyers through CBH Group and GrainCorp terminals.
HOW TO POSITION
Climate-weather overlay with Southern Hemisphere seasonality. Pair with the NOAA ONI signal (ENSO is the dominant climate driver of Australia rainfall), the Russia Wheat Production YoY (alternative supply), and US Wheat Ending Stocks (domestic balance). When Australia Dry fires during an El Niño regime, the Pacific-basin supply-tightening thesis has strongest confluence.
WHAT THE CHART SHOWS
The composite sits at +0.891. Signal state is Extreme POS, 35 trading days running. See the regime table below for per-state baselines.
TOP INPUTS FIRING
- Primary composite +0.891 State Extreme POS, 35 trading days running in the current phase.
- CHIRPS Australia wheatbelt rainfall Daily rainfall aggregate from CHIRPS satellite-plus-station data, rolling z-score, sign-inverted.
THE TAKEAWAY
What this means for you today
THE AUSTRALIA CALL
Composite +0.891, state Extreme POS, 35 trading days running. Current direction and per-state baselines are in the regime table below.
THE EMPIRICAL CONTEXT
Per-state forward returns show a modest directional pattern in the regime table — Australia Dry precedes modestly-less-negative wheat returns than baseline, Australia Wet runs below. The edge concentrates in the Southern Hemisphere growing-season window (May-October); off-season firings carry less conviction.
THE HONEST CAVEAT
Australian wheat is a Pacific-basin supply story; the CBOT SRW contract is a US-based benchmark. Transmission runs through global export substitution rather than direct physical delivery, so the signal shows up at 60-day horizon rather than immediately.
THE REGIME MAP
The three Australia rainfall regime states, forward returns and sample share
Computed from the live window on CBOT SRW Wheat forward returns. Edge concentrates in the Southern Hemisphere growing season.
| State | Phase | Share | Fwd 60d | HAC t | Edge vs baseline | Last firings |
|---|---|---|---|---|---|---|
| Australia Dry TODAY | +1 | 47.9% (4334 d) | -0.25% | +0.35pp | Sep 2026, Aug 2026, Jul 2026 | |
| Normal | 0 | 20.4% (1847 d) | -1.22% | -0.61pp | Aug 2026, Aug 2026, Jul 2026 | |
| Australia Wet | -1 | 31.7% (2865 d) | -0.75% | -0.14pp | Jul 2026, Jul 2026, Jun 2026 |
The historical pattern
The signal across thirty-six years of Australian wheatbelt weather
What this measures
Australia is the world’s number-three wheat exporter; dry conditions across the Western Australia and NSW wheatbelt during the May-October growing season cut yield, reduce exportable surplus, and tighten Pacific-basin wheat balance. The composite reads CHIRPS satellite-plus-station rainfall for the Australian wheatbelt, rolling z-scored, sign-inverted so dry reads positive, tanh-bounded. State thresholds plus-or-minus 0.2 (moderate) and plus-or-minus 0.5 (extreme).
Why it matters
Why Australia reads Pacific-basin wheat supply
Australia is the world’s number-three wheat exporter after Russia and the US. Australian wheat moves almost exclusively to Pacific-basin buyers — Indonesia, the Philippines, Vietnam, Japan, South Korea — through CBH Group and GrainCorp terminals. An Australian production shortfall shifts Pacific-basin demand to US Pacific Northwest wheat (which the SRW contract loosely tracks) or to Russian Novorossiysk exports, both of which transmit to CBOT SRW wheat pricing within the 60-day forward window.
Why CHIRPS rainfall
CHIRPS (Climate Hazards Group InfraRed Precipitation with Station data) is the industry-standard rainfall dataset for agricultural monitoring in data-sparse regions, combining satellite infrared estimates with station observations. For the Australian wheatbelt it provides daily rainfall at approximately 5km spatial resolution back to 1981, which allows the composite to track the growing-season rainfall anomaly on a daily basis rather than waiting for monthly summary statistics from the Australian Bureau of Meteorology.
How to use this signal today
Southern Hemisphere climate overlay. The empirical edge concentrates in the May-October growing-season window. Pair with the NOAA ONI signal (ENSO is the dominant climate driver of Australia rainfall — El Niño drives dry, La Niña drives wet), Russia Wheat Production YoY, and US Wheat Ending Stocks. When Australia Dry fires during an El Niño regime with tight US stocks, the Pacific-basin bullish wheat thesis has its strongest confluence.
Signal consumers and siblings
Not investment advice · The analysis on this page is informational and educational. Signal readings, historical case figures, and empirical statistics are derived from publicly available data and are provided without warranty. Hypothetical performance results have inherent limitations, including the benefit of hindsight. Readers who intend to trade should consult a licensed investment professional and refer to the research brief for the full disclaimer.
Last refreshed Nov 04, 2026 05:57 PM ET