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 2024-12-09.

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% 3 8% 6% 5% 5% 4 6% 7% 34%	105812
	Night	10% 10% 4 9% 6% 5% 5% 4 5% 7% 34%	102556
Transparency	Day	47% 7% 15% 24% 7%	105555
	Night	48% 6% 14% 23% 8% 1	102461
Seeing	Day	15% 9% 31% 28% 13% 3	16339
	Night	16% 7% 31% 33% 12% 1	26311

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	6% 17% 6% 14% 8% 5% 7% 6% 6% 5% 21%	2219
	11th to 20th	Day	4 10% 6% 18% 12% 12% 9% 8% 7% 5% 10%	2199
	21st to end	Day	8% 18% 8% 17% 8% 6% 7% 3 5% 5% 14%	2771
February	1st to 10th	Day	7% 12% 6% 13% 8% 6% 8% 5% 9% 6% 20%	1663
	11th to 20th	Day	7% 10% 4 9% 6% 9% 9% 6% 7% 9% 24%	1664
	21st to end	Day	7% 11% 4 14% 9% 7% 8% 6% 5% 7% 24%	1472
March	1st to 10th	Day	10% 12% 4 11% 12% 6% 5% 4 5% 6% 25%	3241
	11th to 20th	Day	7% 9% 5% 16% 13% 7% 6% 4 5% 6% 22%	3478
	21st to end	Day	9% 15% 7% 11% 7% 4 4 4 5% 6% 29%	3814
April	1st to 10th	Day	10% 12% 4 8% 6% 4 5% 4 5% 7% 34%	2302
	11th to 20th	Day	13% 10% 4 8% 6% 5% 5% 4 5% 8% 32%	2442
	21st to end	Day	16% 10% 3 8% 4 4 4 4 5% 7% 33%	2470
May	1st to 10th	Day	18% 10% 3 8% 4 4 4 4 5% 7% 34%	4272
	11th to 20th	Day	20% 8% 2 6% 5% 5% 4 4 6% 7% 33%	4545
	21st to end	Day	20% 9% 3 7% 4 4 5% 4 5% 5% 34%	5173
June	1st to 10th	Day	14% 7% 3 7% 5% 5% 4 4 6% 9% 36%	2850
	11th to 20th	Day	15% 8% 2 6% 5% 4 6% 4 6% 7% 36%	2850
	21st to end	Day	12% 7% 3 7% 6% 5% 6% 5% 7% 8% 35%	2850
July	1st to 10th	Day	9% 4 2 5% 5% 5% 5% 4 8% 10% 45%	4750
	11th to 20th	Day	8% 4 2 5% 4 4 4 4 6% 10% 49%	4750
	21st to end	Day	6% 3 2 5% 4 5% 5% 4 6% 9% 50%	5106
August	1st to 10th	Day	8% 5% 2 6% 4 4 5% 5% 6% 9% 46%	4206
	11th to 20th	Day	11% 6% 2 5% 4 4 4 4 6% 8% 46%	4041
	21st to end	Day	13% 5% 2 5% 4 4 4 3 6% 9% 45%	4532
September	1st to 10th	Day	10% 5% 2 5% 3 4 4 3 6% 8% 49%	2358
	11th to 20th	Day	14% 7% 3 6% 4 4 4 4 5% 9% 40%	2090
	21st to end	Day	16% 7% 3 5% 4 4 4 3 5% 9% 40%	2090
October	1st to 10th	Day	12% 7% 2 6% 4 4 5% 3 5% 6% 46%	3194
	11th to 20th	Day	11% 9% 3 8% 5% 3 4 3 6% 7% 41%	3121
	21st to end	Day	15% 11% 3 7% 5% 5% 5% 5% 5% 8% 32%	3091
November	1st to 10th	Day	14% 16% 4 10% 6% 5% 4 3 5% 5% 27%	1581
	11th to 20th	Day	11% 16% 7% 15% 7% 5% 4 4 4 5% 23%	1600
	21st to end	Day	13% 13% 5% 14% 10% 7% 5% 3 5% 5% 21%	1520
December	1st to 10th	Day	8% 15% 6% 15% 7% 8% 7% 6% 5% 6% 17%	1386
	11th to 20th	Day	9% 17% 7% 14% 7% 5% 5% 5% 6% 7% 19%	1679
	21st to end	Day	10% 13% 5% 13% 8% 7% 9% 6% 9% 6% 13%	2442
January	1st to 10th	Night	4 13% 6% 14% 8% 10% 9% 5% 7% 6% 18%	4737
	11th to 20th	Night	5% 14% 5% 16% 12% 11% 10% 6% 5% 4 12%	4709
	21st to end	Night	8% 19% 8% 14% 7% 6% 5% 5% 5% 5% 18%	4892
February	1st to 10th	Night	7% 13% 5% 12% 7% 7% 7% 6% 6% 6% 24%	2515
	11th to 20th	Night	7% 10% 3 8% 7% 7% 7% 5% 7% 7% 32%	2403
	21st to end	Night	6% 12% 4 14% 8% 6% 6% 4 5% 6% 29%	1998
March	1st to 10th	Night	11% 11% 3 11% 8% 6% 5% 4 5% 6% 30%	3618
	11th to 20th	Night	5% 10% 4 11% 6% 5% 4 3 6% 8% 39%	3480
	21st to end	Night	11% 13% 5% 12% 6% 4 3 4 4 5% 33%	3817
April	1st to 10th	Night	10% 10% 3 7% 5% 5% 5% 4 5% 7% 40%	1873
	11th to 20th	Night	13% 11% 4 8% 5% 4 3 3 5% 6% 36%	1689
	21st to end	Night	12% 9% 3 7% 5% 5% 5% 4 5% 6% 38%	1710
May	1st to 10th	Night	18% 9% 3 6% 4 4 4 4 6% 8% 34%	2697
	11th to 20th	Night	17% 8% 3 6% 4 4 3 3 5% 6% 40%	2359
	21st to end	Night	19% 9% 2 5% 3 3 3 3 4 6% 42%	2414
June	1st to 10th	Night	12% 6% 3 5% 4 5% 5% 4 5% 8% 43%	1330
	11th to 20th	Night	13% 6% 2 6% 5% 4 4 3 6% 8% 44%	1330
	21st to end	Night	11% 4 3 5% 5% 5% 5% 3 8% 8% 44%	1330
July	1st to 10th	Night	8% 3 1 3 3 4 4 5% 7% 11% 51%	2220
	11th to 20th	Night	5% 3 1 3 3 4 3 3 7% 9% 58%	2220
	21st to end	Night	7% 3 1 4 3 4 6% 5% 7% 10% 50%	2443
August	1st to 10th	Night	5% 5% 2 6% 4 4 5% 4 7% 10% 48%	2734
	11th to 20th	Night	10% 4 2 4 3 4 5% 3 6% 9% 51%	2798
	21st to end	Night	10% 5% 2 6% 4 4 4 4 5% 9% 47%	3135
September	1st to 10th	Night	10% 4 2 5% 4 3 4 4 5% 7% 54%	1818
	11th to 20th	Night	14% 5% 2 6% 3 4 4 4 6% 8% 45%	2090
	21st to end	Night	15% 7% 3 5% 4 4 4 4 5% 7% 42%	2090
October	1st to 10th	Night	15% 7% 3 5% 3 4 3 2 5% 7% 46%	3733
	11th to 20th	Night	12% 10% 3 7% 4 5% 4 3 4 7% 41%	3796
	21st to end	Night	11% 11% 4 8% 5% 4 4 3 5% 6% 38%	4467
November	1st to 10th	Night	13% 15% 5% 10% 6% 5% 4 3 5% 5% 29%	2716
	11th to 20th	Night	11% 17% 6% 12% 6% 5% 4 3 5% 5% 26%	2800
	21st to end	Night	12% 13% 6% 15% 8% 6% 5% 3 4 5% 23%	2875
December	1st to 10th	Night	7% 13% 5% 15% 12% 8% 6% 4 5% 6% 19%	2977
	11th to 20th	Night	9% 16% 6% 15% 8% 5% 5% 4 5% 6% 21%	3518
	21st to end	Night	9% 13% 5% 14% 8% 7% 7% 4 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	62% 7% 13% 15% 4	2219
	11th to 20th	Day	72% 5% 11% 9% 2	2220
	21st to end	Day	71% 5% 7% 12% 4	2771
February	1st to 10th	Day	59% 5% 13% 13% 8% 1	1663
	11th to 20th	Day	52% 7% 14% 19% 7%	1673
	21st to end	Day	58% 6% 11% 16% 8%	1472
March	1st to 10th	Day	58% 7% 13% 18% 4	3241
	11th to 20th	Day	60% 8% 12% 16% 5%	3480
	21st to end	Day	55% 7% 11% 20% 6%	3814
April	1st to 10th	Day	48% 6% 10% 24% 11%	2302
	11th to 20th	Day	50% 5% 12% 22% 10% 1	2442
	21st to end	Day	49% 5% 15% 21% 7% 2	2470
May	1st to 10th	Day	47% 6% 12% 24% 10% 1	4272
	11th to 20th	Day	48% 6% 13% 23% 10% 1	4549
	21st to end	Day	51% 7% 10% 23% 9% 1	5173
June	1st to 10th	Day	42% 8% 16% 24% 9%	2850
	11th to 20th	Day	45% 7% 15% 24% 9% 1	2850
	21st to end	Day	43% 9% 18% 23% 7%	2850
July	1st to 10th	Day	31% 10% 25% 28% 6%	4676
	11th to 20th	Day	29% 7% 24% 33% 7%	4669
	21st to end	Day	29% 8% 20% 36% 7%	4945
August	1st to 10th	Day	32% 9% 19% 31% 10%	4190
	11th to 20th	Day	35% 7% 20% 33% 5%	4080
	21st to end	Day	35% 6% 22% 30% 6%	4531
September	1st to 10th	Day	33% 6% 19% 32% 10% 1	2358
	11th to 20th	Day	41% 7% 21% 26% 5%	2090
	21st to end	Day	43% 5% 15% 31% 7%	2090
October	1st to 10th	Day	38% 5% 15% 29% 12%	3194
	11th to 20th	Day	41% 5% 13% 26% 14%	3121
	21st to end	Day	50% 5% 15% 24% 6%	3091
November	1st to 10th	Day	58% 6% 14% 18% 4 1	1581
	11th to 20th	Day	63% 6% 15% 13% 4	1600
	21st to end	Day	66% 6% 13% 13% 2	1520
December	1st to 10th	Day	65% 8% 13% 10% 4	1386
	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	62% 8% 12% 14% 4	4737
	11th to 20th	Night	72% 5% 8% 12% 2	4750
	21st to end	Night	66% 6% 12% 13% 3	4892
February	1st to 10th	Night	56% 6% 13% 15% 8%	2515
	11th to 20th	Night	47% 7% 16% 20% 10%	2404
	21st to end	Night	54% 5% 12% 18% 10%	1998
March	1st to 10th	Night	52% 7% 12% 20% 9%	3618
	11th to 20th	Night	42% 6% 18% 24% 10%	3480
	21st to end	Night	52% 6% 10% 22% 9% 1	3817
April	1st to 10th	Night	43% 4 12% 23% 16% 2	1873
	11th to 20th	Night	49% 5% 8% 21% 16% 2	1689
	21st to end	Night	45% 6% 11% 26% 10% 2	1710
May	1st to 10th	Night	46% 6% 11% 24% 12%	2697
	11th to 20th	Night	43% 6% 11% 26% 10% 3	2359
	21st to end	Night	42% 5% 11% 27% 13% 1	2414
June	1st to 10th	Night	38% 7% 16% 24% 13% 1	1330
	11th to 20th	Night	37% 8% 16% 24% 12% 2	1330
	21st to end	Night	36% 8% 20% 27% 7% 1	1330
July	1st to 10th	Night	25% 11% 24% 31% 8% 1	2185
	11th to 20th	Night	21% 6% 22% 40% 10%	2178
	21st to end	Night	26% 8% 24% 34% 8% 1	2366
August	1st to 10th	Night	28% 7% 17% 34% 13% 1	2726
	11th to 20th	Night	29% 7% 25% 29% 9%	2825
	21st to end	Night	33% 7% 19% 32% 9%	3135
September	1st to 10th	Night	31% 5% 16% 35% 13% 1	1818
	11th to 20th	Night	36% 7% 18% 28% 10% 1	2090
	21st to end	Night	41% 7% 12% 29% 11% 1	2090
October	1st to 10th	Night	39% 4 11% 34% 12%	3733
	11th to 20th	Night	43% 4 12% 31% 10%	3796
	21st to end	Night	46% 5% 13% 28% 7%	4467
November	1st to 10th	Night	56% 6% 14% 16% 6% 1	2716
	11th to 20th	Night	60% 7% 14% 15% 4 1	2800
	21st to end	Night	64% 6% 13% 13% 5%	2875
December	1st to 10th	Night	64% 7% 15% 11% 3	2977
	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	10% 7% 35% 33% 15%	270
	21st to end	Day	15% 8% 30% 29% 14% 4	297
February	1st to 10th	Day	13% 11% 34% 32% 9% 1	270
	11th to 20th	Day	11% 10% 38% 26% 12% 3	270
	21st to end	Day	9% 5% 47% 27% 11% 1	225
March	1st to 10th	Day	15% 6% 37% 30% 10% 1	270
	11th to 20th	Day	14% 10% 34% 28% 11% 2	270
	21st to end	Day	16% 10% 31% 29% 12% 2	297
April	1st to 10th	Day	15% 10% 36% 26% 10% 3	482
	11th to 20th	Day	18% 12% 33% 25% 11% 1	640
	21st to end	Day	20% 8% 33% 25% 11% 2	650
May	1st to 10th	Day	19% 12% 32% 25% 12% 1	653
	11th to 20th	Day	23% 8% 27% 26% 13% 2	675
	21st to end	Day	21% 9% 25% 28% 15% 2	734
June	1st to 10th	Day	14% 12% 27% 27% 14% 5%	680
	11th to 20th	Day	18% 11% 32% 28% 8% 3	680
	21st to end	Day	13% 8% 27% 31% 15% 5%	680
July	1st to 10th	Day	10% 6% 29% 27% 20% 9%	671
	11th to 20th	Day	12% 6% 30% 28% 18% 6%	668
	21st to end	Day	8% 5% 28% 33% 17% 9%	739
August	1st to 10th	Day	9% 5% 27% 34% 21% 5%	676
	11th to 20th	Day	11% 6% 25% 32% 16% 9%	665
	21st to end	Day	14% 8% 28% 29% 17% 4	748
September	1st to 10th	Day	11% 9% 34% 31% 13% 3	568
	11th to 20th	Day	12% 12% 41% 24% 9% 2	300
	21st to end	Day	22% 8% 37% 24% 8%	300
October	1st to 10th	Day	20% 12% 27% 29% 9% 4	300
	11th to 20th	Day	17% 9% 41% 24% 9%	300
	21st to end	Day	30% 10% 29% 22% 7% 1	330
November	1st to 10th	Day	25% 8% 32% 23% 11% 2	300
	11th to 20th	Day	18% 13% 38% 23% 7% 1	300
	21st to end	Day	20% 12% 38% 22% 7%	300
December	1st to 10th	Day	16% 5% 38% 27% 11% 2	294
	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	15% 6% 34% 34% 10% 1	950
	21st to end	Night	14% 8% 35% 32% 10% 1	1045
February	1st to 10th	Night	14% 8% 27% 38% 13% 1	950
	11th to 20th	Night	12% 7% 31% 35% 13% 3	929
	21st to end	Night	11% 7% 36% 31% 13% 1	742
March	1st to 10th	Night	16% 8% 28% 31% 14% 2	696
	11th to 20th	Night	12% 7% 40% 29% 11% 1	570
	21st to end	Night	19% 7% 27% 30% 13% 3	627
April	1st to 10th	Night	14% 8% 32% 33% 12% 1	570
	11th to 20th	Night	19% 6% 32% 31% 11% 1	563
	21st to end	Night	16% 7% 30% 36% 11% 1	570
May	1st to 10th	Night	19% 6% 37% 27% 10% 1	570
	11th to 20th	Night	20% 6% 31% 31% 12% 1	561
	21st to end	Night	20% 7% 31% 32% 9%	617
June	1st to 10th	Night	16% 5% 28% 35% 15% 1	570
	11th to 20th	Night	16% 6% 31% 32% 14% 1	570
	21st to end	Night	12% 4 22% 41% 19% 1	570
July	1st to 10th	Night	6% 4 25% 42% 22% 2	555
	11th to 20th	Night	9% 6% 25% 41% 19% 1	552
	21st to end	Night	9% 3 22% 43% 20% 3	624
August	1st to 10th	Night	8% 4 22% 46% 19% 1	567
	11th to 20th	Night	12% 3 22% 38% 22% 3	564
	21st to end	Night	13% 5% 25% 37% 18% 1	627
September	1st to 10th	Night	13% 5% 29% 36% 15% 2	570
	11th to 20th	Night	17% 6% 29% 36% 12%	570
	21st to end	Night	19% 6% 33% 32% 9%	570
October	1st to 10th	Night	21% 8% 34% 29% 7%	719
	11th to 20th	Night	20% 9% 35% 27% 9% 1	765
	21st to end	Night	23% 9% 30% 29% 8% 1	1045
November	1st to 10th	Night	20% 9% 35% 25% 9% 1	975
	11th to 20th	Night	20% 9% 33% 28% 9% 2	1000
	21st to end	Night	18% 12% 39% 25% 6% 1	1000
December	1st to 10th	Night	13% 8% 35% 32% 11% 2	993
	11th to 20th	Night	18% 9% 34% 30% 7% 1	950
	21st to end	Night	19% 7% 33% 29% 10% 1	1045

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