Baddeck
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baddeck 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	21% 12% 4 10% 6% 5% 5% 4 5% 6% 24%	101903
	Night	22% 11% 4 10% 6% 5% 5% 4 5% 6% 23%	98018
Transparency	Day	60% 7% 11% 15% 6% 1	105394
	Night	61% 7% 11% 14% 6%	102625
Seeing	Day	30% 23% 28% 14% 4 1	17777
	Night	29% 20% 26% 19% 5%	25195

By Month

Percentage Cloud Cover NE (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	13% 14% 6% 22% 8% 7% 5% 4 5% 5% 13%	2526
	11th to 20th	Day	14% 16% 5% 20% 9% 6% 6% 3 5% 5% 10%	2530
	21st to end	Day	14% 12% 8% 17% 8% 6% 5% 3 4 5% 18%	2849
February	1st to 10th	Day	19% 14% 5% 14% 9% 6% 6% 5% 5% 5% 13%	1710
	11th to 20th	Day	15% 14% 5% 12% 9% 7% 5% 5% 6% 7% 15%	1663
	21st to end	Day	12% 16% 6% 10% 9% 6% 4 3 4 6% 25%	1563
March	1st to 10th	Day	23% 12% 3 8% 5% 6% 4 3 3 4 28%	3114
	11th to 20th	Day	15% 21% 6% 13% 7% 5% 5% 3 4 4 15%	3469
	21st to end	Day	28% 14% 6% 12% 6% 4 4 3 4 3 16%	4032
April	1st to 10th	Day	21% 17% 4 9% 6% 4 4 4 5% 6% 21%	2280
	11th to 20th	Day	21% 14% 3 7% 4 4 4 3 3 6% 31%	2254
	21st to end	Day	23% 14% 3 7% 4 3 4 3 5% 6% 28%	2451
May	1st to 10th	Day	23% 15% 4 9% 5% 4 5% 3 5% 5% 22%	4425
	11th to 20th	Day	20% 9% 3 8% 6% 5% 5% 4 5% 6% 30%	4398
	21st to end	Day	23% 11% 3 7% 5% 5% 4 4 6% 8% 25%	4836
June	1st to 10th	Day	31% 10% 3 8% 4 4 4 3 5% 6% 22%	2660
	11th to 20th	Day	21% 9% 3 7% 4 4 5% 3 5% 7% 33%	2660
	21st to end	Day	31% 10% 3 8% 5% 4 3 3 4 5% 22%	2660
July	1st to 10th	Day	22% 9% 3 8% 6% 5% 4 4 6% 7% 27%	4440
	11th to 20th	Day	20% 8% 3 8% 5% 5% 5% 4 6% 8% 28%	4440
	21st to end	Day	18% 7% 2 6% 4 4 5% 4 7% 8% 34%	4815
August	1st to 10th	Day	20% 10% 3 8% 5% 6% 5% 4 6% 8% 24%	4405
	11th to 20th	Day	21% 7% 3 7% 5% 5% 5% 4 7% 7% 29%	4018
	21st to end	Day	13% 8% 3 7% 5% 5% 5% 4 6% 7% 38%	4180
September	1st to 10th	Day	20% 6% 3 6% 5% 4 4 4 6% 9% 34%	2280
	11th to 20th	Day	21% 7% 3 7% 5% 5% 5% 4 5% 8% 31%	2280
	21st to end	Day	21% 6% 3 6% 4 4 5% 3 6% 8% 34%	2028
October	1st to 10th	Day	19% 8% 3 8% 6% 5% 4 3 6% 8% 30%	1900
	11th to 20th	Day	22% 8% 3 9% 5% 6% 5% 4 6% 7% 23%	1900
	21st to end	Day	23% 12% 4 10% 6% 5% 6% 4 5% 6% 18%	1920
November	1st to 10th	Day	23% 14% 4 10% 6% 5% 5% 3 4 6% 19%	1744
	11th to 20th	Day	26% 19% 5% 11% 6% 5% 5% 3 4 5% 13%	1600
	21st to end	Day	19% 18% 6% 11% 7% 7% 5% 4 7% 5% 12%	1600
December	1st to 10th	Day	25% 16% 7% 12% 8% 5% 5% 3 5% 5% 9%	1584
	11th to 20th	Day	32% 14% 6% 12% 8% 6% 6% 3 3 3 7%	1906
	21st to end	Day	22% 17% 9% 14% 8% 6% 5% 3 4 4 9%	2783
January	1st to 10th	Night	12% 13% 6% 19% 8% 7% 6% 4 5% 6% 12%	4429
	11th to 20th	Night	22% 13% 5% 24% 8% 5% 5% 3 4 3 10%	4440
	21st to end	Night	13% 13% 5% 15% 8% 6% 6% 4 6% 5% 18%	4814
February	1st to 10th	Night	19% 12% 5% 13% 7% 7% 7% 5% 6% 5% 16%	2470
	11th to 20th	Night	18% 13% 5% 11% 7% 7% 6% 3 5% 6% 19%	2403
	21st to end	Night	11% 13% 6% 12% 8% 6% 5% 4 6% 5% 24%	1889
March	1st to 10th	Night	19% 11% 4 9% 7% 5% 3 3 5% 6% 27%	3726
	11th to 20th	Night	21% 14% 4 10% 6% 5% 5% 4 5% 5% 22%	3488
	21st to end	Night	28% 13% 6% 10% 6% 5% 4 2 3 4 19%	3599
April	1st to 10th	Night	24% 11% 4 7% 5% 5% 4 4 5% 6% 25%	1900
	11th to 20th	Night	19% 12% 5% 7% 5% 4 4 3 5% 6% 31%	1876
	21st to end	Night	25% 10% 3 6% 5% 4 3 3 4 4 32%	1725
May	1st to 10th	Night	23% 15% 3 6% 4 4 4 3 5% 8% 25%	2525
	11th to 20th	Night	18% 11% 3 8% 4 4 5% 3 5% 6% 34%	2506
	21st to end	Night	20% 12% 4 8% 6% 4 5% 3 6% 8% 24%	2749
June	1st to 10th	Night	32% 11% 3 7% 5% 4 4 3 4 5% 23%	1520
	11th to 20th	Night	25% 8% 2 5% 5% 2 4 3 4 6% 36%	1520
	21st to end	Night	30% 11% 4 7% 5% 4 4 4 4 6% 22%	1520
July	1st to 10th	Night	23% 9% 4 9% 5% 5% 4 4 5% 7% 24%	2530
	11th to 20th	Night	25% 10% 3 7% 4 5% 4 4 5% 6% 27%	2530
	21st to end	Night	23% 8% 2 6% 3 4 4 5% 6% 6% 33%	2750
August	1st to 10th	Night	22% 8% 3 8% 5% 5% 5% 5% 6% 5% 29%	2532
	11th to 20th	Night	23% 7% 3 6% 4 4 5% 3 7% 8% 29%	2808
	21st to end	Night	16% 6% 2 5% 3 3 4 4 6% 9% 43%	3476
September	1st to 10th	Night	20% 5% 2 5% 4 5% 4 4 7% 8% 37%	1900
	11th to 20th	Night	24% 6% 2 4 4 3 4 4 5% 7% 38%	1900
	21st to end	Night	21% 7% 3 6% 4 4 5% 4 5% 6% 37%	2148
October	1st to 10th	Night	19% 7% 2 7% 5% 5% 5% 4 6% 7% 34%	2280
	11th to 20th	Night	25% 8% 2 5% 5% 4 5% 4 6% 6% 29%	2280
	21st to end	Night	25% 12% 3 7% 5% 5% 5% 4 6% 7% 22%	2676
November	1st to 10th	Night	22% 11% 4 9% 6% 5% 5% 4 6% 6% 22%	2553
	11th to 20th	Night	26% 14% 3 9% 6% 6% 5% 4 6% 6% 15%	2800
	21st to end	Night	24% 13% 5% 10% 6% 6% 5% 5% 6% 7% 13%	2800
December	1st to 10th	Night	24% 16% 5% 11% 6% 6% 4 3 6% 5% 13%	2779
	11th to 20th	Night	33% 13% 4 11% 7% 6% 5% 3 4 4 10%	3293
	21st to end	Night	28% 13% 7% 14% 6% 4 3 3 3 4 14%	4884

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	72% 10% 8% 8% 1	2527
	11th to 20th	Day	75% 6% 11% 7% 2	2530
	21st to end	Day	68% 6% 9% 7% 8% 1	2849
February	1st to 10th	Day	72% 7% 7% 9% 5%	1710
	11th to 20th	Day	68% 8% 11% 8% 4 1	1671
	21st to end	Day	61% 5% 10% 13% 9% 3	1563
March	1st to 10th	Day	61% 4 9% 16% 9%	3118
	11th to 20th	Day	72% 6% 8% 9% 5% 1	3469
	21st to end	Day	74% 4 8% 8% 5% 1	4032
April	1st to 10th	Day	64% 6% 10% 11% 7% 2	2280
	11th to 20th	Day	55% 6% 10% 16% 12% 1	2254
	21st to end	Day	59% 7% 10% 13% 10% 1	2451
May	1st to 10th	Day	65% 8% 9% 12% 5% 1	4440
	11th to 20th	Day	53% 10% 14% 17% 6%	4402
	21st to end	Day	55% 8% 15% 15% 6%	4836
June	1st to 10th	Day	62% 7% 9% 15% 6%	2660
	11th to 20th	Day	50% 8% 13% 19% 9% 1	2660
	21st to end	Day	63% 7% 9% 14% 7%	2660
July	1st to 10th	Day	56% 8% 13% 14% 9% 1	4370
	11th to 20th	Day	52% 9% 15% 19% 5%	4364
	21st to end	Day	46% 9% 18% 21% 6%	4662
August	1st to 10th	Day	57% 8% 13% 17% 5%	4391
	11th to 20th	Day	51% 10% 13% 22% 4	4057
	21st to end	Day	43% 7% 12% 27% 11%	4180
September	1st to 10th	Day	47% 8% 13% 21% 10% 1	2280
	11th to 20th	Day	52% 6% 12% 20% 9% 1	2280
	21st to end	Day	48% 6% 12% 24% 10% 1	2028
October	1st to 10th	Day	55% 6% 12% 18% 9%	3160
	11th to 20th	Day	54% 7% 11% 21% 8%	3140
	21st to end	Day	59% 7% 13% 17% 4	3154
November	1st to 10th	Day	66% 6% 12% 13% 3	1744
	11th to 20th	Day	74% 6% 10% 7% 3	1600
	21st to end	Day	73% 6% 12% 6% 3	1600
December	1st to 10th	Day	77% 6% 8% 7% 2	1584
	11th to 20th	Day	84% 4 5% 5% 1	1905
	21st to end	Day	77% 8% 8% 4 1	2783
January	1st to 10th	Night	71% 11% 11% 6% 1	4429
	11th to 20th	Night	79% 6% 7% 5% 2	4440
	21st to end	Night	66% 8% 10% 9% 7%	4814
February	1st to 10th	Night	70% 7% 9% 8% 5% 1	2470
	11th to 20th	Night	68% 7% 9% 12% 4 1	2406
	21st to end	Night	62% 6% 9% 12% 9% 1	1889
March	1st to 10th	Night	60% 5% 8% 16% 10%	3735
	11th to 20th	Night	64% 8% 9% 13% 6%	3489
	21st to end	Night	71% 4 6% 11% 5% 1	3599
April	1st to 10th	Night	60% 6% 10% 13% 10% 1	1900
	11th to 20th	Night	54% 6% 9% 18% 12% 1	1876
	21st to end	Night	57% 5% 8% 17% 11% 2	1725
May	1st to 10th	Night	56% 9% 14% 14% 6%	2530
	11th to 20th	Night	51% 7% 13% 21% 7% 1	2507
	21st to end	Night	55% 9% 13% 18% 4	2750
June	1st to 10th	Night	65% 5% 9% 15% 5% 1	1520
	11th to 20th	Night	51% 5% 11% 20% 11% 1	1520
	21st to end	Night	63% 6% 10% 14% 7% 1	1520
July	1st to 10th	Night	59% 7% 13% 14% 7%	2491
	11th to 20th	Night	56% 8% 11% 15% 9% 1	2482
	21st to end	Night	51% 8% 13% 20% 7%	2663
August	1st to 10th	Night	55% 7% 16% 18% 4	2521
	11th to 20th	Night	52% 8% 19% 18% 3	2835
	21st to end	Night	37% 9% 16% 30% 9%	3475
September	1st to 10th	Night	44% 8% 14% 23% 10%	1900
	11th to 20th	Night	47% 7% 12% 24% 10% 1	1900
	21st to end	Night	49% 7% 10% 25% 9% 1	2148
October	1st to 10th	Night	52% 7% 14% 18% 9%	3800
	11th to 20th	Night	49% 6% 12% 25% 7%	3779
	21st to end	Night	56% 7% 13% 18% 6%	4401
November	1st to 10th	Night	61% 9% 13% 13% 4	2553
	11th to 20th	Night	69% 8% 11% 9% 3	2800
	21st to end	Night	69% 9% 12% 8% 3	2800
December	1st to 10th	Night	73% 9% 8% 9% 2	2779
	11th to 20th	Night	81% 5% 6% 6% 2	3295
	21st to end	Night	77% 5% 9% 8% 1	4884

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	35% 29% 26% 9% 1	370
	11th to 20th	Day	32% 29% 26% 11% 1	370
	21st to end	Day	25% 31% 30% 11% 3	407
February	1st to 10th	Day	33% 29% 25% 11% 2	370
	11th to 20th	Day	35% 35% 20% 8% 2	366
	21st to end	Day	26% 33% 23% 13% 4 1	307
March	1st to 10th	Day	26% 35% 25% 10% 4	370
	11th to 20th	Day	26% 32% 27% 11% 4 1	456
	21st to end	Day	34% 32% 21% 10% 2 1	506
April	1st to 10th	Day	37% 32% 23% 7% 2	460
	11th to 20th	Day	32% 31% 24% 12% 2	452
	21st to end	Day	33% 26% 25% 12% 2 1	531
May	1st to 10th	Day	37% 25% 21% 10% 4 2	653
	11th to 20th	Day	28% 20% 27% 15% 9% 1	674
	21st to end	Day	28% 24% 31% 14% 3 1	735
June	1st to 10th	Day	40% 15% 26% 16% 4	680
	11th to 20th	Day	24% 21% 34% 15% 5% 1	680
	21st to end	Day	38% 16% 27% 14% 5% 1	680
July	1st to 10th	Day	27% 15% 33% 19% 5% 1	670
	11th to 20th	Day	25% 13% 33% 21% 7%	668
	21st to end	Day	30% 13% 30% 20% 7% 1	740
August	1st to 10th	Day	21% 13% 36% 20% 8% 1	669
	11th to 20th	Day	27% 12% 34% 19% 6% 1	479
	21st to end	Day	22% 17% 35% 18% 7% 1	539
September	1st to 10th	Day	24% 19% 37% 14% 5% 1	490
	11th to 20th	Day	29% 18% 31% 14% 6% 1	490
	21st to end	Day	26% 19% 28% 19% 7% 1	390
October	1st to 10th	Day	24% 19% 34% 15% 7% 2	390
	11th to 20th	Day	28% 23% 26% 16% 4 3	390
	21st to end	Day	34% 24% 26% 10% 6%	429
November	1st to 10th	Day	33% 27% 22% 12% 4 1	395
	11th to 20th	Day	40% 26% 21% 10% 2 1	400
	21st to end	Day	38% 29% 21% 10% 2 1	400
December	1st to 10th	Day	36% 29% 23% 9% 3	394
	11th to 20th	Day	39% 29% 21% 9% 1	370
	21st to end	Day	29% 36% 19% 12% 2 1	407
January	1st to 10th	Night	30% 30% 25% 12% 3	850
	11th to 20th	Night	29% 31% 24% 13% 3	850
	21st to end	Night	25% 29% 27% 15% 5%	913
February	1st to 10th	Night	30% 23% 27% 17% 3	760
	11th to 20th	Night	30% 34% 21% 13% 3	743
	21st to end	Night	23% 26% 29% 18% 5%	628
March	1st to 10th	Night	24% 26% 30% 16% 3	760
	11th to 20th	Night	23% 26% 24% 19% 8%	760
	21st to end	Night	29% 24% 26% 16% 4 1	709
April	1st to 10th	Night	31% 22% 25% 20% 2	570
	11th to 20th	Night	28% 16% 31% 21% 4	564
	21st to end	Night	32% 16% 28% 17% 6%	570
May	1st to 10th	Night	34% 16% 25% 17% 7% 2	570
	11th to 20th	Night	26% 13% 30% 23% 9%	562
	21st to end	Night	25% 17% 31% 22% 4	616
June	1st to 10th	Night	36% 11% 29% 20% 3	570
	11th to 20th	Night	28% 11% 30% 26% 6%	570
	21st to end	Night	35% 8% 30% 22% 4	570
July	1st to 10th	Night	27% 8% 28% 29% 8% 1	556
	11th to 20th	Night	26% 9% 28% 32% 5%	552
	21st to end	Night	30% 6% 29% 28% 7%	623
August	1st to 10th	Night	23% 7% 25% 35% 9% 1	568
	11th to 20th	Night	28% 6% 24% 30% 11% 1	562
	21st to end	Night	21% 9% 26% 33% 11%	627
September	1st to 10th	Night	22% 9% 29% 30% 10% 1	570
	11th to 20th	Night	28% 12% 26% 22% 11% 1	570
	21st to end	Night	26% 14% 31% 23% 6% 1	629
October	1st to 10th	Night	25% 14% 26% 27% 8%	760
	11th to 20th	Night	31% 15% 24% 22% 7% 2	760
	21st to end	Night	34% 21% 24% 16% 4	925
November	1st to 10th	Night	33% 19% 28% 16% 3 1	880
	11th to 20th	Night	38% 22% 20% 14% 5% 1	900
	21st to end	Night	34% 26% 23% 13% 3	900
December	1st to 10th	Night	34% 27% 24% 11% 4	893
	11th to 20th	Night	37% 29% 22% 9% 3	850
	21st to end	Night	33% 28% 24% 11% 2 1	935

Page generated at 2024-12-06 04:54:50. Version ac07

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