Heinola, Finland

1. Thu4 PM53°90%9 mph
2. 5 PM53°92%12 mph
3. 6 PM53°99%12 mph
4. 7 PM53°89%11 mph
5. 8 PM53°83%11 mph
6. 9 PM53°70%11 mph
7. 10 PM53°32%11 mph
8. 11 PM53°38%10 mph
9. Fri12 AM53°72%10 mph
10. 1 AM53°77%9 mph
11. 2 AM54°69%9 mph
12. 3 AM55°39%8 mph
13. 4 AM55°19%7 mph
14. 5 AM54°17%7 mph
15. 6 AM54°17%7 mph
16. 7 AM54°35%7 mph
17. 8 AM54°33%7 mph
18. 9 AM54°31%8 mph
19. 10 AM54°21%8 mph
20. 11 AM54°28%9 mph
21. 12 PM54°25%12 mph
22. 1 PM53°37%11 mph
23. 2 PM53°38%11 mph
24. 3 PM53°46%12 mph
25. 4 PM53°54%12 mph
26. 5 PM53°48%12 mph
27. 6 PM53°44%14 mph
28. 7 PM53°45%13 mph
29. 8 PM53°38%13 mph
30. 9 PM54°29%12 mph
31. 10 PM53°26%12 mph
32. 11 PM53°25%11 mph
33. Sat12 AM53°29%10 mph
34. 1 AM53°28%9 mph
35. 2 AM53°27%8 mph
36. 3 AM53°24%8 mph
37. 4 AM53°30%8 mph
38. 5 AM53°42%9 mph
39. 6 AM53°44%10 mph
40. 7 AM52°47%9 mph
41. 8 AM53°54%8 mph
42. 9 AM53°43%8 mph
43. 10 AM53°41%9 mph
44. 11 AM53°47%9 mph
45. 12 PM54°41%9 mph
46. 1 PM55°41%10 mph
47. 2 PM55°29%10 mph
48. 3 PM55°30%9 mph

Scroll sideways for more hours. Pick an hour for every number.

1. TodaySep 2453°53°Rain99%0.14 inwind 12 mph · gusts 24 mph
2. FriSep 2554°53°Light rain77%0.21 inwind 14 mph · gusts 28 mph
3. SatSep 2655°53°Light rain76%0.14 inwind 10 mph · gusts 22 mph
4. SunSep 2756°47°Cloudy76%0.17 inwind 10 mph · gusts 21 mph
5. MonSep 2859°49°Partly cloudy4%wind 6 mph
6. TueSep 2957°52°Cloudy22%wind 7 mph
7. WedSep 3060°49°Cloudy12%wind 6 mph
8. ThuOct 160°49°Partly cloudy4%wind 6 mph
9. FriOct 261°49°Mostly clear6%wind 7 mph
10. SatOct 359°48°Partly cloudy6%wind 7 mph
11. SunOct 457°48°Cloudy10%wind 6 mph
12. MonOct 5~54°46°Model mean0.03 in
13. TueOct 6~51°47°Model mean0.02 in
14. WedOct 7~55°45°Model mean
15. ThuOct 8~53°44°Model mean
16. FriOct 9~60°47°Model mean

• Feels like51°
• WindNNW 9 mphgusts 17 mph
• Humidity96%
• Dew point53°
• Pressure29.83 inHg
• UV index1 · Lowclear-sky peak 1 today
• Sunrise and sunsetSunrise · Sunset
• Moonrise6:39 PMMoonset 3:35 AM
• Moon phaseWaxing gibbous94% lit

Each line is one model’s own forecast at its own grid cell: three kilometers for HRRR, a quarter of a degree for the global models, which can sit a few hundred meters above or below the town. Where they agree the forecast is settled; where they part is where it is not.

NWS gridGFSGEFS ± spreadECMWFECMWF AI

A ~ marks a high or low read from six-hourly steps, which miss the true extreme by a degree or two.

ECMWF ensemble meteogram

10 daysTemperature plume

None of these is a measurement. Each is a rating of the forecast ahead, and of what is happening at the point right now, against what the activity or the ailment is known to mind, and each names the figure that decided it. An ailment or a pest is rated as a risk, low to extreme; an activity, a chore or a journey as a condition, poor to ideal.

Each rating says which span it is for: the rest of today’s daylight, tonight, or the next 24 hours.

Tonight has no dark, clear hour without a bright moon in this forecast. Rated poor.

Dark is the sun 18 degrees below the horizon; where it never gets that low, 12 degrees, marked nautical. Clear is sky cover of 20% or less. A bright moon is one above the horizon with a quarter or more of its disc lit. Transparency is estimated from surface humidity (70% and 85% mark fair and poor) and visibility, since the forecast carries no haze or high cloud moisture; seeing is not rated. Dew is the air within 2 °C of its dew point. Excellent is four or more clear moonless hours with good transparency; good is three; fair is one, or two clear hours.

Hours fit for spraying, and the days dry enough for fieldwork and hay, read from this forecast’s wind, gusts, humidity, temperature and rain.

Spraying windows

• Sun 3 PM to 9 PM 6 hours, every hour within the rules
• Mon 3 PM to 9 PM 6 hours, every hour within the rules
• Tue 3 PM to 9 PM 6 hours, every hour within the rules
• Wed 3 PM to 9 PM 6 hours, every hour within the rules
• Thu 3 PM to 9 PM 6 hours, every hour within the rules
• Fri 3 PM to 9 PM 6 hours, every hour within the rules
• Sat 3 PM to 9 PM 6 hours, every hour within the rules
• Sun 3 PM to 5 PM 2 hours, every hour within the rules

Good Marginal No

Field days

Spraying: sustained wind 3 to 10 mph, the range US extension services and most labels give; gusts no more than 15 mph (this page’s limit); delta T (air minus wet-bulb temperature) 2 to 8 °C preferred and 8 to 10 °C marginal, from GRDC guidance, with the wet bulb by Stull’s formula; no hour at a 30% chance of rain or 0.25 mm forecast during the rain-free time. Follow the product label, which overrides all of this. Field days: dry is no daytime hour at a 30% chance and under 1 mm all day, wet is 6 mm (0.25 in) or more; soil moisture is not in the forecast, so ground still wet from earlier rain is not accounted for. Hay drying marks a dry day with humidity down to 50% and a breeze of 5 mph or more.

1. This Afternoon53° · 92% · NNW 9–12 mph

   Rain. High near 12°C. Northnorthwest wind 15 to 19 km/h. Chance of precipitation is 92%. Precipitation around 1.3 mm.

2. Tonight53° · 99% · NNE 7–12 mph

   Heavy rain. Low near 12°C. Northnortheast wind 11 to 19 km/h. Chance of precipitation is 99%. Precipitation around 5 mm.

3. Friday54° · 54% · E 7–12 mph

   Light rain. High near 12°C. East wind 12 to 20 km/h. Chance of precipitation is 54%. Precipitation around 3 mm.

4. Friday Night53° · 45% · SE 7–14 mph

   Cloudy. Low near 11°C. Southeast wind 12 to 22 km/h. Chance of precipitation is 45%.

5. Saturday55° · 55% · SSE 7–10 mph

   Light rain. High near 13°C. Southsoutheast wind 12 to 16 km/h. Chance of precipitation is 55%. Precipitation around 1.3 mm.

6. Saturday Night53° · 76% · S 7–10 mph

   Rain. Low near 12°C. South wind 12 to 16 km/h. Chance of precipitation is 76%. Precipitation around 7 mm.

7. Sunday56° · 16% · WNW 7–9 mph

   Cloudy. High near 14°C. Westnorthwest wind 12 to 14 km/h. Chance of precipitation is 16%.

8. Sunday Night47° · 2% · WNW 4–5 mph

   Clear. Low near 8°C. Westnorthwest wind 6 to 8 km/h. Chance of precipitation is 2%.

9. Monday59° · 4% · SSW 4–6 mph

   Partly cloudy. High near 15°C. Southsouthwest wind 7 to 9 km/h. Chance of precipitation is 4%.

10. Monday Night49° · 4% · SSE 6–6 mph

    Partly cloudy. Low near 9°C. Southsoutheast wind 9 to 10 km/h. Chance of precipitation is 4%.

11. Tuesday57° · 22% · S 6–7 mph

    Cloudy. High near 14°C. South wind 10 to 12 km/h. Chance of precipitation is 22%.

12. Tuesday Night52° · 12% · SSW 5–6 mph

    Cloudy. Low near 11°C. Southsouthwest wind 8 to 10 km/h. Chance of precipitation is 12%.

13. Wednesday60° · 4% · SSW 4–6 mph

    Cloudy. High near 15°C. Southsouthwest wind 7 to 9 km/h. Chance of precipitation is 4%.

14. Wednesday Night49° · 2% · SSW 4–4 mph

    Partly cloudy. Low near 9°C. Southsouthwest wind 6 to 7 km/h. Chance of precipitation is 2%.

15. Thursday60° · 4% · S 5–6 mph

    Partly cloudy. High near 16°C. South wind 8 to 10 km/h. Chance of precipitation is 4%.

16. Thursday Night49° · 4% · SSW 6 mph

    Clear. Low near 9°C. Southsouthwest wind around 9 km/h. Chance of precipitation is 4%.

17. Friday61° · 6% · S 6–7 mph

    Mostly clear. High near 16°C. South wind 9 to 11 km/h. Chance of precipitation is 6%.

18. Friday Night49° · 4% · SSW 6–6 mph

    Clear. Low near 10°C. Southsouthwest wind 9 to 10 km/h. Chance of precipitation is 4%.

19. Saturday59° · 4% · SSW 6–7 mph

    Partly cloudy. High near 15°C. Southsouthwest wind 10 to 11 km/h. Chance of precipitation is 4%.

20. Saturday Night48° · 6% · SSW 6–6 mph

    Clear. Low near 9°C. Southsouthwest wind 9 to 10 km/h. Chance of precipitation is 6%.

21. Sunday57° · 10% · SW 6–6 mph

    Cloudy. High near 14°C. Southwest wind 9 to 10 km/h. Chance of precipitation is 10%.

Climate of Heinola: normals, records and every month

The forecast office edits about sixty fields for every cell of its grid. The common ones are above; these are the rest, as the daily extreme, for anyone who needs the mixing height, the fire danger or the swell.