Steinbach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Steinbach clear sky chart from 2005-11-06 to 2024-01-16.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	12% 9% 4 7% 7% 4 5% 6% 6% 7% 34%	74681
	Night	11% 10% 4 8% 7% 4 5% 5% 5% 7% 33%	75149
Transparency	Day	48% 7% 15% 23% 8% 1	74364
	Night	49% 6% 14% 21% 9% 1	74986
Seeing	Day	15% 8% 32% 28% 13% 3	15046
	Night	16% 7% 31% 33% 12% 1	25119

By Month

Percentage Cloud Cover NW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	7% 13% 6% 11% 8% 4 7% 8% 6% 7% 22%	1329
	11th to 20th	Day	7% 13% 6% 13% 11% 7% 7% 9% 8% 5% 15%	1299
	21st to end	Day	11% 14% 8% 14% 11% 5% 8% 5% 7% 6% 10%	1575
February	1st to 10th	Day	7% 11% 6% 11% 10% 5% 8% 7% 8% 7% 20%	1576
	11th to 20th	Day	7% 10% 4 7% 7% 6% 10% 8% 7% 9% 23%	1574
	21st to end	Day	7% 10% 5% 12% 11% 6% 8% 7% 4 7% 23%	1387
March	1st to 10th	Day	12% 13% 5% 10% 10% 5% 6% 6% 5% 6% 23%	1859
	11th to 20th	Day	8% 10% 5% 9% 11% 4 7% 5% 5% 7% 30%	1978
	21st to end	Day	12% 11% 5% 9% 8% 4 5% 6% 5% 7% 29%	2178
April	1st to 10th	Day	11% 11% 5% 7% 7% 3 5% 5% 4 7% 34%	2180
	11th to 20th	Day	13% 9% 4 7% 7% 3 5% 5% 5% 8% 33%	2312
	21st to end	Day	16% 10% 3 7% 5% 3 5% 5% 5% 8% 33%	2340
May	1st to 10th	Day	16% 9% 3 5% 5% 3 3 5% 5% 6% 39%	2422
	11th to 20th	Day	18% 7% 3 5% 5% 2 4 5% 5% 8% 37%	2560
	21st to end	Day	18% 7% 3 5% 5% 3 5% 5% 5% 6% 38%	2918
June	1st to 10th	Day	14% 6% 3 6% 6% 4 5% 5% 6% 9% 37%	2700
	11th to 20th	Day	15% 7% 3 5% 6% 3 5% 5% 6% 8% 36%	2700
	21st to end	Day	13% 6% 3 6% 6% 3 6% 6% 7% 8% 36%	2700
July	1st to 10th	Day	8% 3 2 4 5% 4 5% 5% 7% 10% 48%	2700
	11th to 20th	Day	11% 5% 2 5% 5% 3 5% 6% 6% 9% 44%	2700
	21st to end	Day	8% 4 2 4 4 3 5% 6% 6% 7% 51%	2921
August	1st to 10th	Day	8% 4 2 4 4 3 5% 6% 6% 8% 48%	2392
	11th to 20th	Day	11% 5% 2 4 4 3 4 5% 6% 8% 48%	2301
	21st to end	Day	13% 5% 2 4 5% 3 4 4 5% 7% 47%	2574
September	1st to 10th	Day	11% 5% 2 4 4 3 4 4 6% 8% 49%	2235
	11th to 20th	Day	14% 6% 3 5% 5% 3 4 5% 5% 10% 40%	1980
	21st to end	Day	17% 7% 3 5% 5% 3 4 4 5% 9% 39%	1980
October	1st to 10th	Day	18% 10% 3 6% 5% 3 5% 5% 5% 6% 33%	1820
	11th to 20th	Day	14% 11% 4 9% 7% 3 5% 5% 5% 7% 33%	1793
	21st to end	Day	16% 14% 4 8% 6% 4 5% 6% 5% 7% 25%	1782
November	1st to 10th	Day	15% 14% 6% 9% 7% 3 5% 4 4 5% 28%	1501
	11th to 20th	Day	10% 14% 8% 14% 9% 3 5% 5% 4 5% 23%	1520
	21st to end	Day	14% 12% 6% 10% 12% 6% 5% 4 5% 5% 22%	1444
December	1st to 10th	Day	8% 14% 7% 14% 8% 6% 7% 7% 5% 6% 18%	1330
	11th to 20th	Day	9% 15% 8% 12% 9% 4 5% 6% 6% 7% 19%	1679
	21st to end	Day	10% 12% 6% 11% 10% 5% 8% 9% 9% 6% 13%	2442
January	1st to 10th	Night	6% 12% 7% 12% 9% 5% 9% 8% 6% 6% 21%	2837
	11th to 20th	Night	8% 15% 6% 12% 10% 6% 7% 6% 6% 5% 18%	2789
	21st to end	Night	8% 12% 8% 13% 10% 5% 7% 8% 6% 6% 16%	2777
February	1st to 10th	Night	7% 11% 5% 10% 8% 5% 8% 8% 6% 7% 24%	2382
	11th to 20th	Night	7% 9% 4 7% 8% 5% 8% 7% 7% 7% 31%	2273
	21st to end	Night	7% 10% 5% 12% 9% 5% 6% 5% 5% 6% 29%	1884
March	1st to 10th	Night	11% 11% 5% 9% 8% 3 5% 5% 5% 6% 30%	2100
	11th to 20th	Night	7% 9% 4 8% 6% 4 5% 4 5% 7% 41%	1980
	21st to end	Night	13% 11% 4 8% 6% 3 4 5% 6% 6% 35%	2178
April	1st to 10th	Night	11% 10% 3 6% 5% 3 5% 5% 5% 7% 39%	1776
	11th to 20th	Night	13% 10% 5% 7% 6% 3 4 4 5% 6% 37%	1599
	21st to end	Night	12% 9% 3 7% 6% 3 5% 5% 5% 6% 37%	1620
May	1st to 10th	Night	16% 8% 3 5% 5% 3 4 5% 5% 8% 39%	1537
	11th to 20th	Night	15% 8% 2 4 5% 3 4 4 6% 7% 42%	1334
	21st to end	Night	17% 7% 2 6% 4 3 3 4 4 8% 42%	1358
June	1st to 10th	Night	13% 5% 3 4 5% 3 5% 5% 5% 8% 43%	1260
	11th to 20th	Night	12% 5% 2 5% 5% 3 4 4 6% 8% 45%	1260
	21st to end	Night	10% 3 2 5% 6% 3 6% 5% 7% 8% 44%	1260
July	1st to 10th	Night	6% 3 2 3 3 3 4 4 6% 10% 56%	1260
	11th to 20th	Night	7% 3 2 3 4 4 4 5% 8% 8% 53%	1260
	21st to end	Night	8% 3 1 3 3 2 4 5% 6% 8% 56%	1395
August	1st to 10th	Night	7% 4 2 4 4 2 4 5% 7% 9% 53%	1547
	11th to 20th	Night	10% 3 2 3 4 3 5% 4 6% 8% 53%	1600
	21st to end	Night	11% 5% 2 4 3 2 3 5% 4 8% 53%	1782
September	1st to 10th	Night	10% 4 2 5% 5% 2 4 5% 4 7% 53%	1722
	11th to 20th	Night	14% 5% 2 5% 4 3 4 5% 6% 8% 46%	1980
	21st to end	Night	15% 6% 3 5% 5% 4 4 5% 5% 7% 41%	1980
October	1st to 10th	Night	16% 8% 3 6% 5% 4 5% 3 6% 7% 35%	2121
	11th to 20th	Night	17% 10% 3 7% 5% 3 5% 5% 4 6% 35%	2164
	21st to end	Night	16% 12% 4 8% 6% 4 4 4 5% 6% 31%	2574
November	1st to 10th	Night	13% 14% 6% 9% 6% 3 5% 4 5% 5% 29%	2576
	11th to 20th	Night	11% 15% 7% 10% 8% 3 5% 4 5% 5% 26%	2660
	21st to end	Night	12% 11% 6% 12% 9% 5% 6% 4 4 6% 25%	2731
December	1st to 10th	Night	8% 12% 6% 13% 12% 6% 7% 6% 5% 6% 20%	2850
	11th to 20th	Night	9% 15% 7% 13% 10% 4 6% 5% 5% 6% 21%	3518
	21st to end	Night	10% 12% 5% 11% 10% 6% 7% 6% 6% 6% 21%	5225

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	58% 7% 14% 16% 5%	1329
	11th to 20th	Day	66% 6% 10% 13% 4	1299
	21st to end	Day	72% 4 6% 11% 6%	1575
February	1st to 10th	Day	59% 6% 14% 13% 8% 1	1576
	11th to 20th	Day	52% 8% 14% 19% 7%	1583
	21st to end	Day	60% 6% 11% 17% 7%	1387
March	1st to 10th	Day	60% 7% 12% 16% 5%	1859
	11th to 20th	Day	53% 7% 13% 20% 7%	1980
	21st to end	Day	54% 7% 13% 19% 7% 1	2178
April	1st to 10th	Day	49% 6% 11% 23% 10% 1	2180
	11th to 20th	Day	49% 5% 12% 22% 11% 1	2312
	21st to end	Day	50% 5% 15% 21% 7% 2	2340
May	1st to 10th	Day	46% 4 13% 23% 13% 1	2422
	11th to 20th	Day	44% 5% 12% 25% 12% 1	2564
	21st to end	Day	46% 7% 11% 23% 12% 1	2918
June	1st to 10th	Day	42% 8% 17% 24% 9%	2700
	11th to 20th	Day	45% 7% 15% 24% 9% 1	2700
	21st to end	Day	43% 9% 18% 23% 6%	2700
July	1st to 10th	Day	29% 8% 19% 33% 10% 1	2626
	11th to 20th	Day	36% 7% 18% 29% 10%	2619
	21st to end	Day	30% 8% 17% 33% 11% 1	2759
August	1st to 10th	Day	31% 9% 19% 31% 9% 1	2376
	11th to 20th	Day	33% 8% 20% 33% 6% 1	2301
	21st to end	Day	36% 6% 15% 33% 9%	2574
September	1st to 10th	Day	33% 6% 18% 31% 10% 1	2235
	11th to 20th	Day	41% 7% 21% 26% 6% 1	1980
	21st to end	Day	44% 5% 15% 31% 5%	1980
October	1st to 10th	Day	51% 7% 15% 19% 8%	1820
	11th to 20th	Day	50% 7% 14% 23% 7% 1	1793
	21st to end	Day	58% 6% 16% 17% 3	1782
November	1st to 10th	Day	58% 6% 13% 18% 4 1	1501
	11th to 20th	Day	63% 6% 15% 12% 4	1520
	21st to end	Day	65% 6% 14% 13% 2	1444
December	1st to 10th	Day	65% 7% 14% 11% 4	1330
	11th to 20th	Day	63% 6% 15% 12% 4	1680
	21st to end	Day	65% 7% 9% 15% 5%	2442
January	1st to 10th	Night	60% 8% 11% 15% 5%	2837
	11th to 20th	Night	65% 5% 10% 16% 4	2789
	21st to end	Night	64% 6% 10% 13% 5%	2777
February	1st to 10th	Night	56% 7% 14% 15% 9%	2382
	11th to 20th	Night	47% 7% 16% 19% 10%	2274
	21st to end	Night	54% 5% 11% 19% 10%	1884
March	1st to 10th	Night	53% 6% 12% 20% 8%	2100
	11th to 20th	Night	43% 5% 15% 26% 11% 1	1980
	21st to end	Night	48% 8% 13% 20% 12% 1	2178
April	1st to 10th	Night	44% 4 12% 22% 16% 2	1776
	11th to 20th	Night	48% 5% 8% 21% 16% 2	1599
	21st to end	Night	45% 6% 11% 26% 10% 2	1620
May	1st to 10th	Night	43% 5% 12% 25% 14% 1	1537
	11th to 20th	Night	40% 6% 12% 26% 14% 2	1334
	21st to end	Night	41% 5% 13% 22% 17% 1	1358
June	1st to 10th	Night	38% 7% 17% 24% 12% 1	1260
	11th to 20th	Night	37% 8% 16% 24% 13% 2	1260
	21st to end	Night	36% 9% 20% 27% 7% 1	1260
July	1st to 10th	Night	24% 6% 19% 35% 13% 2	1225
	11th to 20th	Night	26% 8% 21% 28% 17% 1	1218
	21st to end	Night	23% 7% 15% 39% 14% 1	1318
August	1st to 10th	Night	25% 7% 18% 37% 11% 1	1539
	11th to 20th	Night	28% 7% 22% 32% 11% 1	1600
	21st to end	Night	29% 7% 14% 35% 14% 1	1782
September	1st to 10th	Night	31% 5% 15% 34% 14% 1	1722
	11th to 20th	Night	35% 7% 18% 28% 11% 1	1980
	21st to end	Night	41% 7% 13% 29% 10%	1980
October	1st to 10th	Night	48% 6% 15% 22% 8% 1	2121
	11th to 20th	Night	50% 5% 13% 25% 7%	2164
	21st to end	Night	54% 6% 14% 22% 4	2574
November	1st to 10th	Night	56% 6% 14% 16% 6% 1	2576
	11th to 20th	Night	59% 7% 14% 15% 4 1	2660
	21st to end	Night	62% 6% 13% 14% 5%	2731
December	1st to 10th	Night	63% 7% 15% 12% 3	2850
	11th to 20th	Night	63% 6% 13% 13% 5%	3516
	21st to end	Night	61% 5% 11% 17% 5%	5225

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 9% 32% 31% 14% 2	270
	11th to 20th	Day	11% 7% 35% 33% 14%	257
	21st to end	Day	16% 9% 30% 29% 13% 4	264
February	1st to 10th	Day	12% 11% 38% 30% 7% 1	240
	11th to 20th	Day	12% 10% 38% 26% 11% 3	240
	21st to end	Day	9% 6% 48% 27% 11%	198
March	1st to 10th	Day	14% 6% 36% 32% 10% 2	240
	11th to 20th	Day	15% 9% 34% 29% 12% 3	240
	21st to end	Day	16% 10% 31% 28% 13% 2	264
April	1st to 10th	Day	16% 10% 37% 25% 9% 3	440
	11th to 20th	Day	17% 12% 33% 26% 12% 1	590
	21st to end	Day	20% 9% 33% 25% 11% 2	600
May	1st to 10th	Day	18% 12% 31% 25% 12% 1	603
	11th to 20th	Day	23% 7% 27% 27% 14% 2	625
	21st to end	Day	20% 8% 25% 28% 15% 2	679
June	1st to 10th	Day	14% 11% 27% 27% 15% 5%	630
	11th to 20th	Day	17% 11% 31% 28% 9% 3	630
	21st to end	Day	13% 7% 27% 31% 16% 6%	630
July	1st to 10th	Day	10% 6% 30% 28% 20% 7%	621
	11th to 20th	Day	12% 7% 31% 28% 17% 5%	618
	21st to end	Day	8% 6% 27% 33% 18% 9%	684
August	1st to 10th	Day	8% 4 27% 33% 22% 5%	626
	11th to 20th	Day	11% 7% 26% 33% 15% 8%	615
	21st to end	Day	15% 8% 27% 29% 17% 4	693
September	1st to 10th	Day	11% 9% 34% 31% 13% 3	525
	11th to 20th	Day	13% 13% 40% 23% 10% 2	270
	21st to end	Day	23% 7% 38% 23% 8%	270
October	1st to 10th	Day	21% 11% 26% 28% 9% 4	270
	11th to 20th	Day	17% 7% 40% 26% 10%	270
	21st to end	Day	32% 9% 30% 21% 7% 1	297
November	1st to 10th	Day	25% 8% 33% 23% 10% 1	270
	11th to 20th	Day	16% 13% 39% 23% 7% 1	270
	21st to end	Day	20% 13% 40% 19% 7%	270
December	1st to 10th	Day	14% 6% 39% 27% 11% 2	270
	11th to 20th	Day	16% 10% 37% 29% 8%	270
	21st to end	Day	13% 6% 35% 28% 15% 3	297
January	1st to 10th	Night	11% 9% 35% 29% 15% 2	950
	11th to 20th	Night	16% 6% 34% 34% 10% 1	930
	21st to end	Night	14% 8% 35% 32% 10% 1	990
February	1st to 10th	Night	13% 8% 27% 38% 12% 1	900
	11th to 20th	Night	12% 7% 31% 34% 13% 3	879
	21st to end	Night	10% 8% 35% 32% 14% 2	700
March	1st to 10th	Night	16% 8% 28% 32% 14% 2	660
	11th to 20th	Night	13% 7% 39% 29% 11% 1	540
	21st to end	Night	19% 8% 27% 30% 14% 3	594
April	1st to 10th	Night	14% 8% 32% 33% 11% 1	540
	11th to 20th	Night	18% 6% 32% 32% 11% 1	533
	21st to end	Night	16% 7% 30% 36% 10%	540
May	1st to 10th	Night	19% 6% 36% 27% 11% 1	540
	11th to 20th	Night	19% 6% 31% 30% 13% 1	531
	21st to end	Night	20% 7% 31% 33% 9% 1	584
June	1st to 10th	Night	16% 4 28% 35% 16% 1	540
	11th to 20th	Night	15% 6% 30% 33% 15% 1	540
	21st to end	Night	11% 4 22% 41% 20% 1	540
July	1st to 10th	Night	5% 4 26% 43% 21% 1	525
	11th to 20th	Night	9% 6% 25% 41% 18% 1	522
	21st to end	Night	9% 2 22% 43% 20% 3	591
August	1st to 10th	Night	8% 4 23% 46% 18% 1	537
	11th to 20th	Night	11% 3 23% 38% 21% 3	534
	21st to end	Night	14% 5% 24% 38% 19% 1	594
September	1st to 10th	Night	13% 5% 29% 36% 15% 2	540
	11th to 20th	Night	17% 6% 29% 36% 12%	540
	21st to end	Night	19% 5% 33% 33% 10%	540
October	1st to 10th	Night	21% 9% 33% 29% 7%	681
	11th to 20th	Night	20% 9% 34% 27% 9% 1	724
	21st to end	Night	23% 10% 30% 28% 8% 1	990
November	1st to 10th	Night	21% 9% 35% 26% 9% 1	925
	11th to 20th	Night	19% 9% 33% 28% 9% 2	950
	21st to end	Night	18% 12% 39% 24% 6% 1	950
December	1st to 10th	Night	13% 7% 34% 33% 12% 2	950
	11th to 20th	Night	18% 9% 34% 30% 7% 1	950
	21st to end	Night	19% 7% 33% 29% 10% 1	1045

Page generated at 2024-01-13 18:28:30. Version ac07

Copyright 2024 Attilla Danko