Your seasonal context
Understand the place before the date.
The 59218 area uses a representative location near 48.150°, -104.513°. In the nearby historical climate grid, July is the warmest month on average (23.4°C), while January is the coolest (-8.1°C). June has the highest mean daily precipitation (2.42 mm).
Monthly mean temperatures are below freezing in January, February, November, December. Outdoor planting during those months needs a separate protected-growing assessment. Spinach tolerate some cold, but variety, plant age and exposure still matter. A monthly average cannot identify a safe planting day.
Light at your latitude
At 48.150° N, the length of the day changes independently of temperature. Compare the middle of three seasons when planning your garden.
Geometric daylight estimate from latitude and solar declination, rounded to 0.1 hour. This is time above a flat horizon, excluding atmospheric refraction, hills, buildings and cloud cover. It is not the direct-sun exposure of your bed. About solar-position calculations.
| Month | Mean air temperature | Mean precipitation / day |
|---|---|---|
| January | -8.1°C (18°F) | 0.41 mm |
| February | -7.1°C (19°F) | 0.40 mm |
| March | 0.1°C (32°F) | 0.58 mm |
| April | 6.5°C (44°F) | 1.10 mm |
| May | 13.2°C (56°F) | 2.26 mm |
| June | 18.9°C (66°F) | 2.42 mm |
| July | 23.4°C (74°F) | 1.65 mm |
| August | 21.6°C (71°F) | 1.26 mm |
| September | 15.4°C (60°F) | 1.31 mm |
| October | 6.6°C (44°F) | 0.84 mm |
| November | -0.3°C (31°F) | 0.44 mm |
| December | -6.5°C (20°F) | 0.47 mm |
NASA POWER regional grid, 0.5° latitude × 0.625° longitude. Grid center 48.000°, -104.375°. Monthly mean air temperature is neither a nightly low nor soil temperature. Rainfall averages do not set a watering schedule. Open the climate source.
Compare nearby places
Spinach around 59218
Explore the closest listed postal areas by straight-line distance between their representative coordinates. A nearby garden may still have different soil, shelter or elevation.
| Postal area | Distance | Jan | Jul |
|---|---|---|---|
| Culbertson59218 · this area | — | -8.1°C | 23.4°C |
| FroidMT 59226 | 20.6 km | -9.3°C | 22.7°C |
| BainvilleMT 59212 | 23.3 km | -8.1°C | 23.4°C |
| BrocktonMT 59213 | 26.2 km | -7.4°C | 23.8°C |
| HomesteadMT 59242 | 32.2 km | -9.3°C | 22.7°C |
| FairviewMT 59221 | 35.6 km | -8.1°C | 23.4°C |
| Medicine LakeMT 59247 | 37.7 km | -9.3°C | 22.7°C |
Distances use GeoNames representative postal coordinates, which may be estimated; they are not driving distances. Nearby areas often share one NASA POWER grid cell, so identical climate values are expected. Differences shown here describe the climate grids, not a measured difference between individual gardens.
The growing checklist
Give spinach a considered start.
Read the variety guidance for germination conditions. If a hot seedbed gives poor emergence, reassess the conditions before sowing the entire packet again.
- Choose a variety suited to your available space and compare its days to maturity with local seasonal guidance.
- Prepare the seedbed and follow the packet depth and spacing.
- Check the variety’s temperature guidance. Cold tolerance does not mean every seedling survives a freeze.
- Inspect soil moisture and drainage in the actual bed. Regional rainfall averages cannot tell you whether roots need water today.
Read University of Minnesota Extension vegetable guidance. Its crop-care principles are useful here; its Minnesota planting dates are not applied to Montana.
One small next step
Make a date to check your garden.
Choose your own reminder date after checking local advice. This is a personal planning prompt, not a calculated planting recommendation.
An .ics file works with Apple Calendar, Google Calendar and Outlook. Your chosen date stays in your browser until you download it.
What this postal area includes
Culbertson.
A ZIP area is a postal geography, not a neighborhood or municipal boundary. Place names may include multiple communities. The representative coordinates may be estimated. Nearby gardens can differ in elevation, shelter, slope and soil.
