garden plan web app

climate-data-western-zealand.md

@@ -0,0 +1,96 @@
+# Climate Data for Western Zealand, Denmark
+## Garden Planning Reference - Updated January 2026
+
+This document summarizes current climate data for Western Zealand to inform planting and harvest schedules.
+
+## Hardiness Zone
+- **USDA Zone:** 8a-8b (mostly 8b in coastal areas)
+- Denmark ranges from Zone 7a (northern Jutland) to Zone 9b (southern islands)
+- Western Zealand benefits from maritime influence (North Sea/Baltic Sea)
+
+## Frost Dates (Copenhagen reference)
+- **Last Spring Frost:** ~April 20
+- **First Fall Frost:** ~October 10
+- **Frost-Free Days:** 173 days (approximately 5.7 months)
+
+## Temperature Trends (2024-2025)
+### Recent Data Points:
+- **Annual average 2024:** 10.03°C (up from 9.56°C in 2023)
+- **March 2025:** 5.43°C (warmest March in 11 years)
+- **April 2025:** 9.10°C (warmest April in 14 years)
+- **Warming trend:** Clear upward temperature trend continuing
+
+### Seasonal Ranges:
+- **Winter (Dec-Mar):** -4°C to 4°C average
+- **Summer (Jun-Aug):** 15°C to 25°C average
+- **Zealand annual average:** 10°C
+
+## Growing Season
+- **Primary season:** April to October (6-7 months)
+- **Extended season:** Mild winters allow some cold-hardy crops through January-February
+- **Greenhouse starting:** Safe from mid-March onward
+- **Outdoor planting:** After April 20 for frost-sensitive crops
+
+## Planting Guidelines Based on Climate Data
+
+### Early Spring (March-April)
+- **Indoor/Greenhouse (mid-March):** Tomatoes, basil, peppers - safe indoors
+- **Outdoor direct sow (early April):** Rhubarb, parsnips, cabbage, broad beans (hardy)
+- **Outdoor direct sow (late April/early May):** After last frost - beans, carrots, beets, chives, parsley
+
+### Late Spring (May)
+- **Transplant (early May):** Tomatoes, basil after last frost (~May 5-10 is safe)
+- **Direct sow/plant:** Squash, zucchini, cucumbers - soil warm enough
+- **Succession planting:** Begin succession crops for extended harvest
+
+### Summer (June-August)
+- **Early June:** Last chance for summer crops (beans, chard)
+- **Mid-July:** Plant fall/winter crops (kale, carrots for fall harvest)
+- **Late July:** Sow overwintering crops (winter kale, chard)
+
+### Fall (September-October)
+- **Early October:** Plant garlic, overwintering broad beans
+- **Late October:** Mulch beds before first frost (~Oct 10)
+- **November:** Final mulching with straw/leaves for winter protection
+
+### Winter (November-March)
+- **Hardy crops continue:** Kale, chard, leeks can be harvested through February
+- **Garlic matures:** Planted Oct, harvested June (8 months)
+- **Broad beans overwinter:** Planted late Oct, harvest May (7 months)
+
+## Climate Considerations for 2026-2027
+
+### Warming Trends
+- Consistent warming observed 2023-2025
+- Last frost date may be shifting earlier (traditional April 20 may become April 15)
+- Growing season potentially extending at both ends
+
+### Recommendations
+- **Conservative approach:** Still plan for April 20 last frost until multi-year data confirms shift
+- **Monitor:** Track actual last frost in 2026 to adjust 2027 plan
+- **Opportunity:** Warmer springs allow earlier greenhouse starting (mid-March confirmed safe)
+- **Risk management:** Keep row covers/cloches ready for late April cold snaps
+
+### Crop-Specific Notes
+- **Tomatoes:** May still need warm summer to ripen fully; greenhouse starts essential
+- **Winter crops:** Mild winters excellent for kale, chard, leeks through February
+- **Garlic:** October planting confirmed appropriate (needs cold period)
+- **Broad beans:** Overwinter strategy working well with mild Danish winters
+- **Summer squash:** Direct sow early May safe; transplants can go out May 1 with protection
+
+## Data Sources
+- [Denmark Hardiness Zones - PlantMaps](https://www.plantmaps.com/interactive-denmark-hardiness-zone-map-celsius.php)
+- [Climate: Zealand in Denmark - WorldData](https://www.worlddata.info/europe/denmark/climate-zealand.php)
+- [When to Plant Vegetables in Copenhagen - Garden.org](https://garden.org/apps/calendar/?q=copenhagen)
+- [Growing Vegetables In Denmark - GardeningTips.in](https://gardeningtips.in/growing-vegetables-in-denmark-planting-calendar)
+- [Denmark Temperature Data - TradingEconomics](https://tradingeconomics.com/denmark/temperature)
+- [Denmark Climate Knowledge Portal - World Bank](https://climateknowledgeportal.worldbank.org/country/denmark)
+
+## Annual Review Schedule
+- **January:** Review previous year's actual frost dates, update this document
+- **February:** Adjust planting schedule based on updated frost predictions
+- **November:** Document harvest results and crop performance for next year's planning
+
+---
+*Last updated: January 2026*
+*Next review: January 2027*