Burk's Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Burk's Falls clear sky chart from 2005-11-06 to 2024-11-04.

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	17% 12% 4 9% 5% 4 4 3 5% 6% 30%	101868
	Night	16% 14% 5% 9% 5% 4 4 3 4 6% 29%	97165
Transparency	Day	54% 4 10% 21% 9% 1	105446
	Night	56% 4 11% 19% 9% 1	101678
Seeing	Day	25% 15% 30% 19% 8% 2	14997
	Night	24% 13% 29% 25% 9% 1	23934

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	15% 24% 12% 16% 4 2 3 1 3 3 16%	2208
	11th to 20th	Day	11% 17% 9% 22% 7% 5% 4 3 3 4 14%	2560
	21st to end	Day	17% 25% 8% 13% 5% 4 3 2 3 4 15%	3124
February	1st to 10th	Day	13% 20% 7% 16% 8% 4 4 2 4 4 18%	1710
	11th to 20th	Day	13% 18% 7% 13% 6% 4 3 3 4 5% 23%	1663
	21st to end	Day	15% 19% 6% 13% 7% 4 4 3 4 4 20%	1418
March	1st to 10th	Day	18% 17% 5% 9% 5% 5% 4 3 4 6% 25%	3430
	11th to 20th	Day	9% 18% 7% 13% 6% 4 4 3 5% 5% 25%	3480
	21st to end	Day	13% 14% 6% 8% 5% 5% 4 3 3 6% 34%	3815
April	1st to 10th	Day	20% 16% 5% 7% 4 4 3 3 4 7% 26%	2260
	11th to 20th	Day	22% 12% 3 6% 4 4 3 3 4 6% 33%	2366
	21st to end	Day	21% 13% 3 8% 4 3 3 2 3 5% 33%	2470
May	1st to 10th	Day	20% 9% 3 8% 5% 5% 4 3 5% 7% 31%	4222
	11th to 20th	Day	15% 8% 3 7% 5% 4 4 4 5% 8% 37%	4398
	21st to end	Day	19% 6% 2 6% 4 4 4 3 5% 7% 40%	4837
June	1st to 10th	Day	20% 9% 3 7% 4 4 4 4 5% 7% 32%	2709
	11th to 20th	Day	15% 7% 3 7% 5% 5% 5% 3 5% 7% 37%	2850
	21st to end	Day	20% 9% 2 7% 5% 5% 4 4 6% 6% 32%	2850
July	1st to 10th	Day	16% 7% 3 7% 5% 5% 5% 4 6% 8% 34%	4760
	11th to 20th	Day	15% 6% 2 6% 4 5% 5% 4 6% 8% 38%	4600
	21st to end	Day	12% 6% 2 6% 4 4 4 3 6% 8% 46%	4689
August	1st to 10th	Day	14% 8% 3 7% 5% 5% 6% 5% 6% 8% 33%	4104
	11th to 20th	Day	18% 7% 3 6% 5% 5% 5% 4 6% 8% 34%	4044
	21st to end	Day	10% 5% 2 6% 5% 5% 4 5% 6% 8% 43%	4404
September	1st to 10th	Day	17% 7% 2 7% 5% 4 4 3 6% 7% 38%	2280
	11th to 20th	Day	16% 8% 2 6% 4 4 4 3 5% 6% 43%	2184
	21st to end	Day	23% 9% 2 7% 4 5% 4 3 4 6% 33%	2043
October	1st to 10th	Day	20% 10% 3 6% 4 5% 5% 3 5% 6% 33%	1900
	11th to 20th	Day	26% 14% 3 9% 5% 4 3 3 4 5% 23%	1900
	21st to end	Day	32% 14% 5% 8% 4 3 3 3 3 4 20%	2085
November	1st to 10th	Day	19% 16% 4 8% 5% 4 5% 3 4 6% 25%	1529
	11th to 20th	Day	19% 20% 6% 10% 5% 4 4 2 4 6% 21%	1520
	21st to end	Day	24% 21% 8% 11% 6% 3 4 2 4 4 14%	1520
December	1st to 10th	Day	18% 27% 5% 12% 6% 3 3 4 4 5% 14%	1520
	11th to 20th	Day	19% 23% 6% 12% 6% 4 3 2 4 4 18%	1906
	21st to end	Day	22% 25% 7% 14% 5% 3 3 2 3 3 13%	2510
January	1st to 10th	Night	16% 22% 10% 16% 6% 4 4 3 4 4 12%	4748
	11th to 20th	Night	12% 18% 6% 19% 10% 7% 4 3 4 5% 13%	4391
	21st to end	Night	15% 22% 11% 13% 6% 5% 3 2 3 3 16%	4532
February	1st to 10th	Night	13% 19% 6% 13% 8% 5% 5% 4 4 5% 18%	2470
	11th to 20th	Night	12% 17% 8% 14% 6% 4 4 3 4 5% 24%	2403
	21st to end	Night	13% 19% 6% 13% 8% 5% 4 2 5% 4 20%	2032
March	1st to 10th	Night	15% 15% 5% 9% 5% 5% 3 4 5% 6% 29%	3408
	11th to 20th	Night	12% 19% 8% 8% 5% 4 4 3 4 5% 27%	3479
	21st to end	Night	14% 11% 6% 7% 7% 5% 4 3 4 5% 33%	3817
April	1st to 10th	Night	21% 16% 3 6% 4 3 4 3 5% 5% 29%	1919
	11th to 20th	Night	18% 12% 3 6% 3 4 4 3 4 6% 36%	1780
	21st to end	Night	20% 11% 4 9% 6% 4 3 3 4 6% 31%	1710
May	1st to 10th	Night	15% 10% 3 7% 4 4 4 4 5% 7% 36%	2719
	11th to 20th	Night	14% 7% 3 7% 3 5% 5% 4 7% 8% 37%	2495
	21st to end	Night	12% 9% 3 6% 4 4 4 3 6% 8% 41%	2738
June	1st to 10th	Night	15% 9% 3 7% 5% 5% 4 4 5% 6% 36%	1465
	11th to 20th	Night	15% 5% 1 5% 5% 3 5% 3 5% 8% 44%	1330
	21st to end	Night	15% 8% 3 6% 4 4 4 4 6% 7% 38%	1330
July	1st to 10th	Night	13% 7% 3 6% 4 4 4 3 5% 7% 45%	2210
	11th to 20th	Night	17% 6% 2 6% 3 3 3 3 5% 6% 46%	2362
	21st to end	Night	12% 7% 2 4 3 3 4 4 5% 8% 48%	2859
August	1st to 10th	Night	12% 6% 2 6% 4 4 4 3 6% 9% 45%	2825
	11th to 20th	Night	18% 7% 2 5% 3 3 4 4 5% 6% 43%	2785
	21st to end	Night	16% 5% 1 5% 3 3 3 3 4 7% 49%	3218
September	1st to 10th	Night	14% 5% 2 5% 4 4 4 4 6% 7% 45%	1900
	11th to 20th	Night	14% 6% 2 5% 3 4 4 3 5% 6% 48%	1993
	21st to end	Night	18% 8% 3 6% 3 4 4 3 5% 7% 40%	2137
October	1st to 10th	Night	19% 9% 3 7% 4 4 4 3 5% 5% 36%	2280
	11th to 20th	Night	24% 13% 3 8% 5% 4 5% 3 4 6% 25%	2280
	21st to end	Night	27% 18% 4 8% 4 4 3 3 3 4 23%	2511
November	1st to 10th	Night	22% 15% 3 6% 4 4 3 2 5% 6% 29%	2622
	11th to 20th	Night	19% 16% 4 9% 5% 5% 4 3 5% 6% 25%	2660
	21st to end	Night	23% 20% 6% 10% 6% 4 3 3 4 6% 15%	2660
December	1st to 10th	Night	19% 26% 7% 12% 6% 5% 3 3 3 3 12%	2660
	11th to 20th	Night	19% 23% 7% 12% 5% 3 3 2 3 4 18%	3288
	21st to end	Night	22% 23% 8% 15% 5% 4 3 2 3 3 12%	5149

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	76% 2 9% 8% 5%	2209
	11th to 20th	Day	76% 3 6% 9% 5% 1	2560
	21st to end	Day	75% 3 5% 10% 6% 1	3124
February	1st to 10th	Day	72% 3 6% 14% 5% 1	1710
	11th to 20th	Day	64% 3 9% 13% 9% 2	1672
	21st to end	Day	69% 2 8% 13% 7%	1418
March	1st to 10th	Day	62% 3 13% 11% 11% 1	3433
	11th to 20th	Day	61% 4 11% 15% 8% 1	3480
	21st to end	Day	53% 4 8% 22% 11% 2	3815
April	1st to 10th	Day	59% 3 10% 17% 9% 2	2260
	11th to 20th	Day	54% 3 7% 23% 12% 1	2366
	21st to end	Day	55% 3 8% 16% 14% 3	2470
May	1st to 10th	Day	51% 5% 8% 23% 11% 2	4234
	11th to 20th	Day	44% 5% 11% 30% 9% 1	4402
	21st to end	Day	44% 5% 12% 19% 16% 3	4837
June	1st to 10th	Day	52% 4 10% 22% 12%	2709
	11th to 20th	Day	45% 4 10% 25% 14% 1	2850
	21st to end	Day	51% 5% 13% 19% 10% 1	2850
July	1st to 10th	Day	47% 6% 14% 23% 9% 1	4686
	11th to 20th	Day	41% 6% 14% 30% 8%	4520
	21st to end	Day	37% 5% 11% 32% 16%	4540
August	1st to 10th	Day	46% 6% 12% 26% 9%	4091
	11th to 20th	Day	47% 5% 13% 26% 8%	4083
	21st to end	Day	38% 6% 12% 34% 10%	4404
September	1st to 10th	Day	44% 5% 12% 27% 11%	2280
	11th to 20th	Day	42% 4 14% 29% 11% 1	2184
	21st to end	Day	54% 4 9% 24% 8%	2043
October	1st to 10th	Day	51% 5% 11% 23% 9% 1	3160
	11th to 20th	Day	55% 6% 11% 22% 6%	3140
	21st to end	Day	67% 4 12% 14% 4	3411
November	1st to 10th	Day	60% 5% 13% 17% 5%	1529
	11th to 20th	Day	66% 5% 9% 13% 5% 1	1520
	21st to end	Day	75% 4 8% 10% 3 1	1520
December	1st to 10th	Day	74% 5% 9% 10% 2 1	1520
	11th to 20th	Day	72% 4 6% 12% 6%	1906
	21st to end	Day	79% 2 4 13% 3	2510
January	1st to 10th	Night	78% 3 6% 9% 3	4748
	11th to 20th	Night	74% 5% 8% 8% 4 1	4391
	21st to end	Night	75% 3 6% 9% 6% 1	4532
February	1st to 10th	Night	68% 4 9% 13% 5% 1	2470
	11th to 20th	Night	63% 3 9% 18% 7% 1	2405
	21st to end	Night	67% 3 9% 13% 6% 1	2032
March	1st to 10th	Night	56% 4 11% 16% 11% 2	3418
	11th to 20th	Night	59% 3 13% 16% 8% 1	3480
	21st to end	Night	52% 4 6% 23% 12% 2	3817
April	1st to 10th	Night	58% 3 8% 18% 11% 2	1919
	11th to 20th	Night	51% 3 7% 22% 15% 2	1780
	21st to end	Night	56% 5% 7% 15% 15% 3	1710
May	1st to 10th	Night	46% 5% 10% 26% 11% 1	2726
	11th to 20th	Night	42% 6% 10% 26% 14% 1	2496
	21st to end	Night	40% 5% 12% 25% 16% 2	2739
June	1st to 10th	Night	48% 4 12% 21% 12% 3	1465
	11th to 20th	Night	38% 4 12% 27% 19%	1330
	21st to end	Night	43% 6% 15% 22% 12% 1	1330
July	1st to 10th	Night	39% 5% 15% 25% 15% 2	2175
	11th to 20th	Night	40% 4 13% 33% 9% 1	2320
	21st to end	Night	35% 6% 10% 31% 17% 1	2768
August	1st to 10th	Night	37% 6% 17% 24% 15% 2	2814
	11th to 20th	Night	40% 6% 18% 25% 9% 1	2812
	21st to end	Night	36% 4 13% 34% 12% 1	3218
September	1st to 10th	Night	36% 8% 14% 28% 13% 1	1900
	11th to 20th	Night	36% 5% 15% 31% 13%	1993
	21st to end	Night	44% 4 14% 27% 10%	2137
October	1st to 10th	Night	42% 5% 10% 28% 14%	3800
	11th to 20th	Night	53% 4 15% 20% 8%	3779
	21st to end	Night	61% 4 16% 13% 5%	4135
November	1st to 10th	Night	58% 4 13% 20% 6%	2622
	11th to 20th	Night	61% 5% 12% 16% 6% 1	2660
	21st to end	Night	71% 4 10% 11% 4	2660
December	1st to 10th	Night	78% 4 5% 9% 3	2660
	11th to 20th	Night	72% 4 6% 12% 5% 1	3288
	21st to end	Night	79% 3 6% 9% 3	5149

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	24% 26% 30% 14% 4 1	180
	11th to 20th	Day	26% 20% 33% 16% 4	202
	21st to end	Day	29% 17% 32% 17% 5%	297
February	1st to 10th	Day	29% 30% 32% 7% 2 1	270
	11th to 20th	Day	26% 27% 35% 12% 1	270
	21st to end	Day	38% 24% 31% 7%	225
March	1st to 10th	Day	25% 22% 34% 15% 3	458
	11th to 20th	Day	23% 21% 37% 14% 5% 1	460
	21st to end	Day	31% 18% 30% 15% 5% 1	506
April	1st to 10th	Day	30% 19% 31% 14% 5% 1	460
	11th to 20th	Day	37% 17% 22% 15% 6% 3	452
	21st to end	Day	32% 14% 33% 13% 7% 1	460
May	1st to 10th	Day	29% 14% 27% 19% 9% 2	463
	11th to 20th	Day	22% 15% 30% 19% 10% 3	487
	21st to end	Day	21% 17% 31% 19% 10% 2	529
June	1st to 10th	Day	24% 14% 31% 24% 6% 1	539
	11th to 20th	Day	19% 14% 33% 23% 9% 2	680
	21st to end	Day	25% 13% 33% 20% 8% 1	680
July	1st to 10th	Day	14% 11% 34% 29% 11% 1	671
	11th to 20th	Day	16% 12% 29% 28% 12% 3	574
	21st to end	Day	14% 10% 31% 29% 12% 3	532
August	1st to 10th	Day	17% 10% 27% 28% 12% 5%	486
	11th to 20th	Day	18% 7% 26% 24% 16% 9%	479
	21st to end	Day	18% 10% 30% 24% 14% 4	539
September	1st to 10th	Day	19% 11% 31% 22% 12% 6%	490
	11th to 20th	Day	18% 7% 24% 27% 17% 8%	490
	21st to end	Day	26% 12% 23% 22% 14% 3	490
October	1st to 10th	Day	26% 15% 26% 20% 10% 3	490
	11th to 20th	Day	31% 16% 33% 14% 4 2	490
	21st to end	Day	40% 16% 27% 15% 2	534
November	1st to 10th	Day	32% 19% 33% 14% 2	196
	11th to 20th	Day	32% 21% 34% 9% 4	180
	21st to end	Day	33% 19% 37% 7% 2 1	180
December	1st to 10th	Day	30% 17% 38% 14% 2	180
	11th to 20th	Day	38% 21% 27% 11% 2 1	180
	21st to end	Day	33% 23% 28% 13% 1 2	198
January	1st to 10th	Night	28% 17% 32% 17% 5% 1	950
	11th to 20th	Night	31% 15% 30% 18% 5%	776
	21st to end	Night	21% 12% 35% 24% 7% 1	836
February	1st to 10th	Night	24% 19% 34% 20% 3	760
	11th to 20th	Night	21% 19% 33% 22% 5%	743
	21st to end	Night	25% 21% 29% 23% 3	628
March	1st to 10th	Night	22% 19% 35% 20% 4	760
	11th to 20th	Night	22% 18% 35% 20% 5% 1	760
	21st to end	Night	22% 15% 30% 26% 7%	836
April	1st to 10th	Night	31% 12% 32% 21% 4	760
	11th to 20th	Night	25% 15% 28% 22% 9% 1	656
	21st to end	Night	25% 12% 28% 24% 10% 1	570
May	1st to 10th	Night	22% 8% 27% 32% 10% 1	508
	11th to 20th	Night	20% 9% 30% 33% 8%	374
	21st to end	Night	14% 9% 36% 33% 8%	411
June	1st to 10th	Night	17% 9% 33% 32% 9%	380
	11th to 20th	Night	17% 9% 24% 39% 11%	380
	21st to end	Night	19% 8% 26% 33% 13% 1	380
July	1st to 10th	Night	14% 3 25% 42% 16% 1	370
	11th to 20th	Night	14% 6% 26% 35% 18%	368
	21st to end	Night	12% 6% 23% 39% 18% 1	487
August	1st to 10th	Night	16% 4 18% 38% 22% 2	567
	11th to 20th	Night	15% 4 18% 39% 22% 2	564
	21st to end	Night	19% 5% 25% 31% 17% 3	682
September	1st to 10th	Night	16% 6% 26% 31% 18% 2	760
	11th to 20th	Night	16% 7% 25% 28% 21% 3	760
	21st to end	Night	22% 8% 23% 28% 16% 3	760
October	1st to 10th	Night	24% 11% 27% 26% 12% 1	760
	11th to 20th	Night	29% 12% 29% 21% 7% 1	760
	21st to end	Night	37% 14% 28% 17% 4	836
November	1st to 10th	Night	32% 12% 26% 22% 7% 1	755
	11th to 20th	Night	28% 18% 28% 20% 6%	760
	21st to end	Night	36% 13% 29% 19% 3 1	760
December	1st to 10th	Night	33% 17% 30% 16% 5%	760
	11th to 20th	Night	31% 18% 32% 14% 3 1	760
	21st to end	Night	35% 15% 29% 18% 3	997

Page generated at 2024-11-01 22:47:34. Version ac07

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