NZD/USD December Shows 1.18% Average Return, 70% Win Rate | AlphaTRADER
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#Seasonality AI Analysis
May 28, 2026

NZD/USD December Shows 1.18% Average Return, 70% Win Rate

Monthly Bias Map

In examining 20 years of NZD/USD data, a few months stand out in terms of their historical tendencies. December emerges as a particularly favorable month with an average return of +1.18% and a strong win-rate of 70%. In contrast, August is notably weak, with a -1.34% average return and a win-rate of only 35%. These patterns suggest that certain months may offer probabilistic biases based on historical performance.

The reasons behind these monthly tendencies can often be attributed to macroeconomic flows and calendar effects. December's strength might be linked to year-end market positioning and rebalancing activities, as traders close positions or adjust portfolios. On the other hand, August's weakness could be influenced by the lower liquidity typical of summer months, potentially exacerbating negative moves.

Best and Worst Months

December's positive bias, with an average return of +1.18% and a 70% win-rate, makes it the best performing month for NZD/USD. This period often aligns with a reduction in market volatility as traders wrap up their yearly activities, leading to more predictable market flows.

Conversely, August presents the most significant downside risk, with an average return of -1.34% and a win-rate of just 35%. This could be due to the thin trading volumes often seen in August, which can lead to increased volatility and sharper price movements.

Day-of-Week Tilts

Analyzing the day-of-week performance, Wednesday stands out as the least negative day, with an average return of +0.021% and the highest win-rate of 39% among weekdays. Despite being the best day, it's important to note that these figures suggest only modest advantages, reflecting the overall lack of strong day-of-week seasonality in NZD/USD.

Where Seasonality Breaks

While historical seasonality provides a valuable probabilistic framework, it is not foolproof. Macroeconomic shocks, such as unexpected central bank actions or geopolitical events, can disrupt these patterns. Additionally, shifts in market regimes, such as changes in interest rate differentials or global risk sentiment, can alter traditional seasonal trends.

Where This Fits

Seasonality should be considered one of several tools in a trader's arsenal. It provides historical context but should be weighed against current market conditions and other technical and fundamental analyses. For a more comprehensive view, traders can explore the NZD/USD live dashboard for up-to-date insights and data.

Generated by Neural Engine v4.5