Beckwith Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Beckwith Park 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	16% 10% 3 8% 5% 5% 5% 4 5% 7% 33%	101573
	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 32%	97444
Transparency	Day	50% 7% 11% 21% 10% 1	105069
	Night	52% 6% 11% 20% 10% 1	102024
Seeing	Day	23% 16% 30% 20% 8% 3	14484
	Night	23% 14% 30% 24% 9% 1	23576

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	14% 17% 6% 11% 7% 6% 4 3 4 5% 23%	2517
	11th to 20th	Day	14% 15% 6% 12% 7% 7% 5% 3 4 5% 22%	2520
	21st to end	Day	15% 19% 6% 14% 7% 6% 4 3 4 4 17%	2934
February	1st to 10th	Day	15% 15% 5% 13% 7% 5% 4 3 5% 5% 23%	1710
	11th to 20th	Day	12% 14% 5% 10% 6% 5% 4 3 5% 5% 28%	1663
	21st to end	Day	20% 14% 3 9% 6% 5% 5% 4 5% 5% 24%	1565
March	1st to 10th	Day	19% 15% 4 10% 5% 4 3 3 3 6% 27%	3144
	11th to 20th	Day	12% 15% 5% 9% 6% 6% 4 4 5% 5% 29%	3480
	21st to end	Day	12% 9% 3 8% 6% 4 3 3 5% 5% 42%	4002
April	1st to 10th	Day	21% 12% 3 8% 4 4 4 3 4 6% 32%	2280
	11th to 20th	Day	22% 9% 3 7% 4 4 3 3 4 5% 36%	2254
	21st to end	Day	23% 9% 3 8% 5% 3 4 3 4 6% 32%	2398
May	1st to 10th	Day	20% 8% 3 7% 5% 5% 5% 4 6% 6% 32%	4426
	11th to 20th	Day	16% 10% 3 8% 4 4 5% 4 5% 7% 33%	4398
	21st to end	Day	14% 7% 3 7% 5% 4 6% 3 6% 8% 38%	4837
June	1st to 10th	Day	20% 10% 2 7% 5% 5% 5% 4 5% 7% 30%	2660
	11th to 20th	Day	14% 6% 2 7% 5% 4 5% 5% 7% 8% 38%	2660
	21st to end	Day	17% 7% 3 7% 6% 5% 5% 4 7% 6% 32%	2660
July	1st to 10th	Day	11% 7% 3 6% 5% 5% 6% 5% 7% 9% 36%	4440
	11th to 20th	Day	12% 5% 2 6% 5% 4 5% 5% 7% 9% 40%	4440
	21st to end	Day	10% 6% 2 6% 4 5% 5% 5% 7% 9% 43%	4814
August	1st to 10th	Day	15% 8% 3 8% 5% 5% 4 4 5% 8% 35%	4305
	11th to 20th	Day	16% 7% 3 6% 4 5% 5% 4 6% 8% 38%	4012
	21st to end	Day	14% 6% 2 6% 4 5% 5% 5% 7% 10% 38%	4180
September	1st to 10th	Day	13% 6% 2 6% 5% 5% 4 5% 6% 7% 41%	2280
	11th to 20th	Day	12% 5% 2 6% 4 4 5% 3 6% 7% 47%	2280
	21st to end	Day	17% 6% 2 6% 5% 4 4 4 5% 7% 39%	2022
October	1st to 10th	Day	20% 9% 2 7% 4 4 4 4 4 6% 36%	1900
	11th to 20th	Day	20% 10% 3 8% 6% 5% 5% 4 4 6% 29%	1900
	21st to end	Day	25% 11% 3 8% 5% 3 5% 3 4 6% 27%	1956
November	1st to 10th	Day	15% 9% 3 7% 5% 5% 6% 4 5% 6% 34%	1698
	11th to 20th	Day	17% 13% 3 9% 6% 4 5% 4 5% 6% 28%	1520
	21st to end	Day	20% 15% 4 10% 5% 6% 5% 4 5% 5% 21%	1520
December	1st to 10th	Day	22% 18% 5% 9% 6% 5% 4 4 5% 5% 17%	1520
	11th to 20th	Day	20% 15% 5% 8% 5% 5% 3 3 4 5% 25%	1906
	21st to end	Day	27% 16% 5% 12% 5% 3 4 2 3 3 19%	2772
January	1st to 10th	Night	17% 15% 7% 11% 6% 5% 4 3 5% 6% 21%	4429
	11th to 20th	Night	13% 15% 5% 14% 8% 5% 5% 4 4 5% 22%	4440
	21st to end	Night	17% 19% 7% 10% 7% 5% 4 3 4 4 20%	4720
February	1st to 10th	Night	14% 16% 4 12% 8% 5% 5% 3 5% 6% 23%	2470
	11th to 20th	Night	13% 13% 6% 11% 7% 5% 4 3 4 5% 29%	2403
	21st to end	Night	14% 14% 3 9% 7% 5% 5% 3 4 6% 29%	1888
March	1st to 10th	Night	21% 11% 4 9% 5% 5% 4 3 4 4 31%	3692
	11th to 20th	Night	16% 16% 5% 9% 5% 4 4 3 5% 5% 26%	3479
	21st to end	Night	15% 9% 3 7% 5% 4 4 3 5% 6% 40%	3629
April	1st to 10th	Night	19% 11% 3 7% 6% 4 4 3 5% 5% 34%	1900
	11th to 20th	Night	19% 9% 3 9% 5% 4 3 3 3 5% 36%	1875
	21st to end	Night	20% 11% 3 8% 5% 3 4 3 4 6% 33%	1794
May	1st to 10th	Night	20% 9% 4 7% 5% 4 5% 5% 6% 6% 30%	2514
	11th to 20th	Night	19% 8% 3 6% 5% 5% 4 3 5% 6% 36%	2495
	21st to end	Night	14% 7% 2 6% 4 4 5% 4 5% 8% 41%	2738
June	1st to 10th	Night	17% 7% 2 8% 6% 4 5% 4 6% 8% 33%	1520
	11th to 20th	Night	14% 6% 3 7% 5% 3 4 4 5% 7% 42%	1520
	21st to end	Night	17% 8% 3 7% 5% 4 5% 3 6% 7% 35%	1520
July	1st to 10th	Night	10% 7% 3 9% 6% 5% 5% 4 6% 9% 35%	2520
	11th to 20th	Night	13% 6% 2 6% 4 4 4 4 6% 8% 43%	2520
	21st to end	Night	9% 6% 2 6% 5% 5% 5% 4 6% 8% 43%	2739
August	1st to 10th	Night	11% 7% 2 8% 4 4 4 4 6% 9% 41%	2622
	11th to 20th	Night	12% 8% 3 6% 4 4 4 4 5% 7% 43%	2785
	21st to end	Night	10% 6% 2 6% 5% 5% 5% 4 6% 8% 42%	3476
September	1st to 10th	Night	11% 5% 2 7% 5% 3 4 3 4 6% 48%	1900
	11th to 20th	Night	14% 4 2 5% 3 3 4 3 5% 7% 50%	1900
	21st to end	Night	16% 6% 2 5% 4 4 4 3 4 7% 43%	2153
October	1st to 10th	Night	17% 9% 3 6% 4 3 4 3 5% 7% 38%	2280
	11th to 20th	Night	20% 9% 3 6% 5% 5% 5% 4 5% 6% 32%	2280
	21st to end	Night	22% 10% 4 8% 4 4 4 4 5% 6% 29%	2641
November	1st to 10th	Night	19% 11% 3 6% 4 3 4 3 5% 6% 36%	2453
	11th to 20th	Night	17% 11% 3 8% 5% 4 6% 3 5% 6% 31%	2657
	21st to end	Night	21% 14% 3 9% 6% 5% 4 3 5% 6% 24%	2660
December	1st to 10th	Night	20% 18% 4 12% 6% 4 4 4 5% 5% 18%	2660
	11th to 20th	Night	21% 15% 4 9% 6% 4 3 3 3 4 27%	3288
	21st to end	Night	30% 17% 5% 12% 4 4 3 3 3 3 17%	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	62% 6% 13% 11% 6% 1	2518
	11th to 20th	Day	64% 6% 10% 12% 7% 1	2520
	21st to end	Day	71% 6% 9% 9% 5% 1	2934
February	1st to 10th	Day	63% 6% 7% 18% 5% 2	1710
	11th to 20th	Day	58% 5% 10% 17% 9% 1	1672
	21st to end	Day	61% 5% 10% 12% 10% 1	1565
March	1st to 10th	Day	59% 5% 10% 16% 9% 1	3147
	11th to 20th	Day	55% 7% 11% 16% 10% 2	3480
	21st to end	Day	43% 5% 6% 23% 18% 4	4002
April	1st to 10th	Day	54% 4 6% 19% 13% 3	2280
	11th to 20th	Day	51% 4 7% 20% 16% 2	2254
	21st to end	Day	55% 5% 7% 15% 14% 4	2398
May	1st to 10th	Day	51% 7% 8% 21% 11% 2	4440
	11th to 20th	Day	48% 9% 12% 20% 9% 1	4402
	21st to end	Day	42% 7% 11% 24% 15% 1	4837
June	1st to 10th	Day	53% 6% 9% 19% 12% 1	2660
	11th to 20th	Day	42% 9% 10% 24% 12% 2	2660
	21st to end	Day	50% 8% 11% 18% 11% 1	2660
July	1st to 10th	Day	41% 8% 13% 26% 12% 1	4370
	11th to 20th	Day	37% 8% 15% 31% 9%	4365
	21st to end	Day	37% 8% 12% 31% 12%	4661
August	1st to 10th	Day	47% 7% 13% 23% 9% 1	4291
	11th to 20th	Day	42% 7% 13% 28% 9% 1	4051
	21st to end	Day	40% 7% 15% 27% 11% 1	4180
September	1st to 10th	Day	40% 7% 13% 28% 11%	2280
	11th to 20th	Day	35% 7% 12% 31% 14%	2280
	21st to end	Day	43% 6% 14% 26% 10%	2022
October	1st to 10th	Day	46% 5% 11% 30% 7%	3160
	11th to 20th	Day	46% 5% 14% 24% 10%	3140
	21st to end	Day	49% 5% 17% 22% 7%	3194
November	1st to 10th	Day	48% 7% 13% 23% 7% 1	1698
	11th to 20th	Day	57% 5% 13% 14% 10% 1	1520
	21st to end	Day	64% 8% 12% 10% 7%	1520
December	1st to 10th	Day	68% 7% 11% 11% 3	1520
	11th to 20th	Day	62% 7% 14% 12% 4	1906
	21st to end	Day	72% 4 6% 14% 4	2772
January	1st to 10th	Night	64% 7% 13% 12% 4	4429
	11th to 20th	Night	64% 7% 13% 11% 5%	4440
	21st to end	Night	68% 6% 9% 10% 6% 1	4720
February	1st to 10th	Night	62% 5% 11% 16% 6% 1	2470
	11th to 20th	Night	58% 5% 10% 19% 8% 1	2405
	21st to end	Night	57% 5% 9% 19% 10% 1	1888
March	1st to 10th	Night	57% 4 9% 20% 9% 1	3702
	11th to 20th	Night	58% 6% 12% 15% 8% 1	3480
	21st to end	Night	45% 5% 6% 24% 17% 3	3629
April	1st to 10th	Night	53% 4 7% 19% 14% 2	1900
	11th to 20th	Night	52% 4 6% 20% 17% 1	1875
	21st to end	Night	53% 6% 6% 16% 16% 3	1794
May	1st to 10th	Night	52% 8% 9% 19% 9% 3	2520
	11th to 20th	Night	46% 9% 10% 23% 11% 1	2496
	21st to end	Night	39% 8% 13% 21% 18% 1	2739
June	1st to 10th	Night	47% 8% 11% 22% 11% 1	1520
	11th to 20th	Night	40% 6% 11% 23% 17% 2	1520
	21st to end	Night	46% 9% 11% 20% 13%	1520
July	1st to 10th	Night	43% 8% 15% 20% 14% 2	2480
	11th to 20th	Night	38% 7% 13% 34% 9%	2472
	21st to end	Night	37% 9% 15% 23% 15% 1	2651
August	1st to 10th	Night	39% 8% 14% 26% 13% 1	2612
	11th to 20th	Night	39% 7% 16% 29% 8%	2812
	21st to end	Night	37% 8% 15% 27% 12% 1	3476
September	1st to 10th	Night	38% 7% 10% 30% 14% 1	1900
	11th to 20th	Night	32% 7% 13% 35% 11% 1	1900
	21st to end	Night	40% 6% 12% 29% 11% 1	2153
October	1st to 10th	Night	40% 6% 11% 30% 12%	3800
	11th to 20th	Night	43% 6% 15% 26% 10%	3779
	21st to end	Night	48% 6% 17% 21% 8%	4340
November	1st to 10th	Night	50% 5% 13% 22% 9% 1	2453
	11th to 20th	Night	54% 6% 11% 18% 10% 1	2657
	21st to end	Night	60% 6% 13% 16% 5%	2660
December	1st to 10th	Night	68% 7% 9% 13% 4	2660
	11th to 20th	Night	62% 5% 10% 15% 7% 1	3288
	21st to end	Night	73% 4 7% 13% 3	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	22% 24% 33% 16% 5%	180
	11th to 20th	Day	29% 21% 32% 15% 2 1	180
	21st to end	Day	25% 18% 36% 17% 3	245
February	1st to 10th	Day	30% 29% 28% 13% 1	270
	11th to 20th	Day	26% 29% 38% 6% 1	270
	21st to end	Day	32% 21% 34% 11% 1	377
March	1st to 10th	Day	26% 22% 32% 17% 4	460
	11th to 20th	Day	27% 20% 32% 16% 3	460
	21st to end	Day	30% 23% 28% 13% 5% 1	506
April	1st to 10th	Day	31% 21% 28% 14% 5% 1	460
	11th to 20th	Day	35% 19% 22% 15% 7% 2	452
	21st to end	Day	32% 19% 28% 14% 6% 2	460
May	1st to 10th	Day	26% 14% 32% 20% 5% 3	463
	11th to 20th	Day	20% 18% 31% 21% 7% 3	487
	21st to end	Day	18% 16% 33% 20% 10% 2	529
June	1st to 10th	Day	25% 13% 32% 21% 8% 1	490
	11th to 20th	Day	17% 15% 32% 23% 10% 2	490
	21st to end	Day	23% 13% 33% 18% 12% 2	490
July	1st to 10th	Day	13% 8% 29% 33% 14% 2	485
	11th to 20th	Day	12% 11% 32% 28% 13% 3	484
	21st to end	Day	13% 9% 32% 31% 12% 3	532
August	1st to 10th	Day	15% 10% 30% 29% 12% 4	486
	11th to 20th	Day	15% 8% 27% 29% 16% 6%	479
	21st to end	Day	13% 12% 31% 25% 12% 7%	539
September	1st to 10th	Day	16% 13% 28% 25% 11% 7%	490
	11th to 20th	Day	12% 10% 25% 23% 18% 12%	490
	21st to end	Day	19% 13% 29% 22% 13% 4	490
October	1st to 10th	Day	25% 15% 25% 19% 12% 4	490
	11th to 20th	Day	27% 20% 29% 17% 6% 2	490
	21st to end	Day	31% 18% 28% 19% 4	468
November	1st to 10th	Day	26% 20% 29% 19% 6% 1	374
	11th to 20th	Day	28% 24% 27% 13% 7% 1	180
	21st to end	Day	31% 21% 34% 9% 4	180
December	1st to 10th	Day	31% 18% 36% 14% 2	180
	11th to 20th	Day	30% 29% 28% 11% 2	180
	21st to end	Day	33% 23% 26% 15% 2 1	198
January	1st to 10th	Night	28% 19% 32% 17% 4	760
	11th to 20th	Night	30% 18% 29% 19% 4 1	760
	21st to end	Night	21% 15% 35% 24% 5%	836
February	1st to 10th	Night	23% 21% 33% 19% 3	760
	11th to 20th	Night	21% 19% 40% 16% 3	743
	21st to end	Night	24% 22% 31% 19% 5%	628
March	1st to 10th	Night	25% 16% 34% 22% 4	760
	11th to 20th	Night	24% 22% 29% 19% 5%	760
	21st to end	Night	24% 15% 31% 23% 7% 1	836
April	1st to 10th	Night	27% 15% 32% 22% 4	760
	11th to 20th	Night	26% 18% 28% 19% 8% 1	751
	21st to end	Night	27% 13% 29% 23% 7% 1	654
May	1st to 10th	Night	23% 9% 28% 28% 10% 1	380
	11th to 20th	Night	21% 10% 33% 28% 8%	374
	21st to end	Night	16% 7% 37% 28% 12%	411
June	1st to 10th	Night	19% 7% 31% 35% 8%	380
	11th to 20th	Night	18% 8% 29% 32% 13% 1	380
	21st to end	Night	19% 8% 31% 29% 13%	380
July	1st to 10th	Night	8% 6% 31% 39% 14% 1	370
	11th to 20th	Night	13% 5% 27% 40% 14% 1	368
	21st to end	Night	10% 4 30% 43% 13% 1	416
August	1st to 10th	Night	10% 5% 28% 38% 18% 1	442
	11th to 20th	Night	11% 4 24% 33% 26% 2	564
	21st to end	Night	13% 7% 29% 32% 17% 2	836
September	1st to 10th	Night	15% 6% 32% 29% 16% 1	760
	11th to 20th	Night	18% 7% 22% 28% 22% 4	760
	21st to end	Night	18% 10% 26% 24% 20% 2	760
October	1st to 10th	Night	20% 12% 28% 24% 15% 2	760
	11th to 20th	Night	25% 14% 29% 23% 9% 1	760
	21st to end	Night	27% 17% 26% 25% 6%	836
November	1st to 10th	Night	28% 14% 29% 21% 7% 1	755
	11th to 20th	Night	26% 16% 32% 17% 9% 1	760
	21st to end	Night	30% 18% 27% 18% 6% 1	760
December	1st to 10th	Night	31% 18% 30% 19% 3	760
	11th to 20th	Night	28% 18% 30% 19% 4 1	760
	21st to end	Night	35% 16% 28% 18% 2	836

Page generated at 2024-11-01 22:47:39. Version ac07

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