Veasey Memorial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Veasey Memorial Park clear sky chart from 2005-11-06 to 2024-11-05.

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% 7% 2 6% 4 4 4 4 5% 7% 38%	101235
	Night	18% 8% 2 6% 4 4 4 3 5% 6% 39%	97809
Transparency	Day	44% 6% 12% 22% 14% 2	104773
	Night	44% 6% 12% 22% 15% 2	102347
Seeing	Day	21% 15% 33% 21% 8% 2	15036
	Night	21% 13% 33% 25% 7% 1	23894

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% 7% 3 6% 3 3 4 3 5% 6% 44%	2517
	11th to 20th	Day	17% 6% 3 7% 4 4 5% 3 4 5% 42%	2520
	21st to end	Day	20% 11% 3 6% 4 5% 4 3 4 5% 35%	2772
February	1st to 10th	Day	18% 8% 4 5% 4 4 4 5% 5% 7% 36%	1752
	11th to 20th	Day	14% 7% 2 7% 4 5% 5% 4 6% 7% 39%	1848
	21st to end	Day	17% 11% 3 6% 5% 4 4 4 5% 5% 37%	1570
March	1st to 10th	Day	25% 14% 2 5% 4 3 4 3 4 5% 29%	3116
	11th to 20th	Day	14% 8% 2 6% 4 5% 4 4 6% 7% 39%	3351
	21st to end	Day	23% 10% 3 6% 3 3 4 4 5% 6% 33%	3998
April	1st to 10th	Day	19% 10% 3 7% 4 3 3 3 5% 6% 37%	2280
	11th to 20th	Day	18% 7% 2 5% 5% 4 5% 5% 5% 7% 38%	2286
	21st to end	Day	21% 6% 3 7% 5% 4 4 3 5% 7% 36%	2470
May	1st to 10th	Day	22% 11% 3 8% 5% 4 4 3 5% 7% 28%	4106
	11th to 20th	Day	22% 9% 3 7% 5% 4 4 3 5% 7% 33%	4141
	21st to end	Day	14% 5% 2 5% 4 4 4 3 5% 8% 44%	4837
June	1st to 10th	Day	19% 7% 2 5% 4 5% 5% 4 7% 7% 35%	2660
	11th to 20th	Day	16% 6% 2 6% 4 4 5% 4 6% 8% 39%	2660
	21st to end	Day	18% 7% 2 6% 5% 4 5% 4 7% 8% 34%	2660
July	1st to 10th	Day	14% 7% 2 7% 4 5% 5% 5% 7% 9% 36%	4440
	11th to 20th	Day	11% 6% 2 6% 4 4 5% 4 7% 10% 41%	4440
	21st to end	Day	17% 6% 3 7% 5% 4 5% 4 6% 8% 35%	4814
August	1st to 10th	Day	15% 5% 3 7% 5% 5% 5% 5% 7% 8% 33%	4143
	11th to 20th	Day	14% 8% 3 7% 4 4 5% 4 6% 7% 37%	4045
	21st to end	Day	8% 4 2 5% 5% 4 6% 5% 7% 10% 45%	4181
September	1st to 10th	Day	13% 6% 2 5% 4 4 4 3 6% 7% 47%	2266
	11th to 20th	Day	15% 6% 2 5% 3 3 3 3 4 5% 51%	2090
	21st to end	Day	17% 6% 2 5% 4 3 3 3 5% 6% 44%	2090
October	1st to 10th	Day	22% 5% 2 6% 4 4 4 4 5% 5% 39%	2090
	11th to 20th	Day	15% 5% 2 5% 4 4 4 4 5% 7% 46%	1851
	21st to end	Day	21% 7% 2 6% 4 4 4 3 5% 5% 40%	1881
November	1st to 10th	Day	16% 7% 2 5% 4 3 3 3 4 5% 49%	1708
	11th to 20th	Day	19% 7% 2 4 3 2 4 3 5% 6% 45%	1710
	21st to end	Day	19% 7% 2 5% 3 4 3 3 5% 6% 43%	1710
December	1st to 10th	Day	18% 8% 2 7% 4 5% 4 3 5% 6% 39%	1554
	11th to 20th	Day	21% 7% 2 5% 3 4 3 3 3 5% 44%	1906
	21st to end	Day	22% 10% 4 6% 4 4 4 4 4 5% 33%	2772
January	1st to 10th	Night	18% 7% 2 5% 3 3 3 3 5% 6% 45%	4429
	11th to 20th	Night	15% 8% 3 8% 5% 4 4 4 4 6% 40%	4440
	21st to end	Night	20% 13% 3 7% 4 5% 4 3 5% 5% 30%	4884
February	1st to 10th	Night	16% 9% 3 6% 5% 4 5% 4 5% 6% 38%	2424
	11th to 20th	Night	14% 9% 3 6% 4 5% 4 3 6% 6% 40%	2218
	21st to end	Night	18% 10% 2 5% 4 3 4 3 6% 5% 42%	1884
March	1st to 10th	Night	28% 10% 2 5% 3 3 4 3 4 5% 33%	3724
	11th to 20th	Night	12% 8% 3 8% 5% 5% 6% 4 5% 6% 37%	3607
	21st to end	Night	24% 8% 2 6% 4 4 4 4 6% 5% 33%	3631
April	1st to 10th	Night	19% 9% 3 7% 5% 4 4 3 5% 6% 36%	1900
	11th to 20th	Night	20% 8% 2 6% 4 4 4 3 4 6% 40%	1842
	21st to end	Night	21% 6% 3 6% 4 5% 4 3 5% 5% 38%	1710
May	1st to 10th	Night	24% 11% 3 8% 5% 4 4 3 5% 6% 26%	2834
	11th to 20th	Night	20% 8% 3 8% 6% 5% 5% 5% 7% 7% 27%	2767
	21st to end	Night	17% 7% 3 6% 4 4 3 3 6% 7% 41%	2738
June	1st to 10th	Night	18% 8% 2 7% 6% 5% 4 3 5% 7% 36%	1520
	11th to 20th	Night	19% 7% 2 5% 4 3 4 4 6% 9% 37%	1520
	21st to end	Night	16% 7% 2 6% 5% 4 4 4 6% 8% 37%	1520
July	1st to 10th	Night	12% 6% 2 8% 5% 5% 6% 5% 7% 9% 34%	2520
	11th to 20th	Night	10% 6% 2 8% 5% 5% 5% 4 5% 10% 39%	2520
	21st to end	Night	16% 7% 3 8% 5% 4 4 4 5% 7% 37%	2739
August	1st to 10th	Night	20% 7% 2 7% 5% 5% 5% 4 6% 7% 33%	2753
	11th to 20th	Night	12% 7% 3 8% 5% 5% 6% 5% 7% 8% 34%	2782
	21st to end	Night	9% 4 2 5% 3 4 4 4 5% 9% 52%	3471
September	1st to 10th	Night	13% 6% 2 5% 4 4 3 3 5% 7% 48%	1914
	11th to 20th	Night	14% 6% 1 5% 3 3 3 2 4 6% 53%	2090
	21st to end	Night	17% 6% 2 6% 4 3 4 3 6% 6% 44%	2090
October	1st to 10th	Night	21% 6% 2 6% 4 4 3 3 4 6% 40%	2090
	11th to 20th	Night	16% 5% 1 5% 3 4 4 3 6% 6% 46%	2327
	21st to end	Night	22% 7% 2 5% 3 4 4 4 5% 6% 39%	2717
November	1st to 10th	Night	14% 5% 2 5% 5% 4 4 2 4 6% 48%	2470
	11th to 20th	Night	18% 6% 2 5% 4 4 4 3 4 5% 46%	2470
	21st to end	Night	16% 7% 3 5% 4 4 3 3 5% 6% 44%	2470
December	1st to 10th	Night	19% 9% 3 6% 4 4 5% 4 4 5% 38%	2622
	11th to 20th	Night	20% 5% 2 5% 4 4 4 3 6% 6% 40%	3288
	21st to end	Night	21% 9% 3 6% 5% 4 4 3 4 5% 36%	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	40% 4 10% 33% 11% 1	2518
	11th to 20th	Day	44% 5% 12% 25% 13% 2	2520
	21st to end	Day	52% 5% 10% 23% 9% 2	2772
February	1st to 10th	Day	47% 6% 12% 20% 13% 2	1752
	11th to 20th	Day	44% 6% 11% 21% 15% 3	1857
	21st to end	Day	48% 5% 11% 20% 13% 3	1570
March	1st to 10th	Day	57% 4 9% 15% 12% 2	3119
	11th to 20th	Day	40% 6% 15% 22% 14% 3	3351
	21st to end	Day	51% 5% 6% 16% 15% 8%	3998
April	1st to 10th	Day	48% 5% 9% 18% 17% 4	2280
	11th to 20th	Day	44% 5% 12% 20% 16% 3	2286
	21st to end	Day	47% 6% 7% 19% 17% 3	2470
May	1st to 10th	Day	56% 7% 11% 16% 10% 1	4120
	11th to 20th	Day	50% 8% 15% 16% 10% 2	4145
	21st to end	Day	36% 8% 13% 23% 18% 2	4837
June	1st to 10th	Day	47% 7% 13% 21% 11% 1	2660
	11th to 20th	Day	42% 6% 15% 20% 15% 3	2660
	21st to end	Day	46% 7% 13% 22% 11% 1	2660
July	1st to 10th	Day	43% 7% 12% 21% 15% 1	4370
	11th to 20th	Day	38% 6% 16% 26% 13% 1	4365
	21st to end	Day	46% 6% 12% 21% 13% 2	4661
August	1st to 10th	Day	45% 8% 17% 22% 8% 1	4129
	11th to 20th	Day	43% 8% 13% 26% 9% 1	4084
	21st to end	Day	31% 8% 13% 29% 18% 2	4181
September	1st to 10th	Day	35% 6% 12% 24% 21% 1	2266
	11th to 20th	Day	36% 4 9% 27% 22% 3	2090
	21st to end	Day	40% 6% 9% 23% 21% 2	2090
October	1st to 10th	Day	43% 5% 10% 22% 18% 2	3480
	11th to 20th	Day	31% 4 8% 29% 24% 3	3041
	21st to end	Day	34% 4 9% 31% 20% 3	3081
November	1st to 10th	Day	38% 5% 12% 27% 16% 2	1708
	11th to 20th	Day	41% 4 8% 23% 20% 3	1710
	21st to end	Day	42% 5% 15% 22% 14% 2	1710
December	1st to 10th	Day	47% 5% 14% 17% 16% 2	1554
	11th to 20th	Day	45% 4 12% 19% 15% 5%	1906
	21st to end	Day	52% 5% 12% 20% 10% 1	2772
January	1st to 10th	Night	40% 4 13% 29% 12% 3	4429
	11th to 20th	Night	45% 6% 12% 22% 12% 3	4440
	21st to end	Night	56% 5% 10% 17% 10% 2	4884
February	1st to 10th	Night	46% 5% 13% 20% 13% 3	2424
	11th to 20th	Night	45% 4 11% 21% 16% 4	2220
	21st to end	Night	43% 4 9% 25% 14% 4	1884
March	1st to 10th	Night	54% 5% 9% 17% 12% 3	3734
	11th to 20th	Night	45% 7% 13% 17% 16% 3	3608
	21st to end	Night	51% 5% 6% 14% 17% 7%	3631
April	1st to 10th	Night	48% 5% 10% 18% 16% 3	1900
	11th to 20th	Night	46% 4 8% 20% 19% 3	1842
	21st to end	Night	47% 5% 10% 18% 16% 3	1710
May	1st to 10th	Night	57% 6% 12% 16% 8% 2	2840
	11th to 20th	Night	52% 8% 15% 14% 9% 2	2768
	21st to end	Night	41% 7% 15% 20% 15% 1	2739
June	1st to 10th	Night	48% 6% 12% 22% 12%	1520
	11th to 20th	Night	43% 7% 14% 20% 14% 2	1520
	21st to end	Night	41% 10% 13% 21% 13% 1	1520
July	1st to 10th	Night	43% 8% 13% 22% 14%	2480
	11th to 20th	Night	40% 8% 15% 23% 14%	2472
	21st to end	Night	45% 7% 11% 21% 14% 1	2651
August	1st to 10th	Night	50% 8% 12% 19% 11% 1	2743
	11th to 20th	Night	44% 10% 14% 21% 10%	2809
	21st to end	Night	28% 7% 16% 27% 22% 1	3471
September	1st to 10th	Night	36% 6% 11% 26% 20% 1	1914
	11th to 20th	Night	34% 5% 10% 24% 26% 2	2090
	21st to end	Night	40% 6% 8% 25% 19% 2	2090
October	1st to 10th	Night	41% 5% 14% 23% 15% 2	3480
	11th to 20th	Night	27% 4 10% 28% 27% 3	3863
	21st to end	Night	34% 4 11% 31% 18% 2	4467
November	1st to 10th	Night	37% 6% 12% 23% 19% 3	2470
	11th to 20th	Night	41% 4 10% 23% 19% 3	2470
	21st to end	Night	41% 5% 13% 25% 14% 2	2470
December	1st to 10th	Night	48% 4 11% 23% 12% 1	2622
	11th to 20th	Night	44% 5% 14% 17% 19% 1	3288
	21st to end	Night	50% 5% 9% 24% 11% 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	24% 22% 31% 19% 3	180
	11th to 20th	Day	23% 27% 35% 12% 3 1	180
	21st to end	Day	22% 24% 37% 13% 5%	198
February	1st to 10th	Day	27% 22% 36% 14% 1	364
	11th to 20th	Day	26% 26% 36% 11% 2	456
	21st to end	Day	24% 20% 36% 16% 4	382
March	1st to 10th	Day	25% 18% 39% 14% 3	460
	11th to 20th	Day	24% 24% 36% 13% 3 1	460
	21st to end	Day	28% 21% 33% 11% 5% 2	506
April	1st to 10th	Day	27% 24% 28% 15% 5% 1	460
	11th to 20th	Day	24% 22% 33% 14% 5%	452
	21st to end	Day	25% 15% 37% 19% 3 1	460
May	1st to 10th	Day	29% 20% 33% 12% 5% 1	463
	11th to 20th	Day	19% 15% 40% 20% 5% 1	487
	21st to end	Day	18% 13% 34% 28% 7% 1	529
June	1st to 10th	Day	20% 11% 37% 22% 10% 1	490
	11th to 20th	Day	13% 14% 38% 26% 8% 1	490
	21st to end	Day	19% 11% 38% 24% 8% 1	490
July	1st to 10th	Day	17% 5% 32% 30% 13% 2	485
	11th to 20th	Day	14% 8% 31% 32% 13% 2	484
	21st to end	Day	12% 6% 35% 37% 10% 1	532
August	1st to 10th	Day	11% 7% 30% 37% 12% 2	486
	11th to 20th	Day	15% 7% 29% 30% 15% 4	479
	21st to end	Day	13% 6% 31% 31% 14% 4	539
September	1st to 10th	Day	16% 10% 29% 27% 15% 4	490
	11th to 20th	Day	19% 11% 29% 19% 15% 8%	490
	21st to end	Day	18% 11% 32% 25% 10% 4	490
October	1st to 10th	Day	25% 13% 25% 22% 11% 3	490
	11th to 20th	Day	20% 15% 28% 25% 9% 2	425
	21st to end	Day	26% 12% 35% 18% 7% 1	429
November	1st to 10th	Day	16% 17% 34% 22% 9% 2	378
	11th to 20th	Day	25% 22% 28% 19% 5% 1	370
	21st to end	Day	26% 19% 29% 18% 6% 1	370
December	1st to 10th	Day	22% 25% 33% 15% 5%	214
	11th to 20th	Day	30% 21% 36% 12% 2	180
	21st to end	Day	23% 25% 32% 13% 5% 2	198
January	1st to 10th	Night	20% 19% 41% 17% 3	760
	11th to 20th	Night	25% 20% 36% 17% 2	760
	21st to end	Night	20% 21% 37% 19% 4	836
February	1st to 10th	Night	22% 18% 37% 22% 1	760
	11th to 20th	Night	21% 20% 42% 15% 3	743
	21st to end	Night	24% 18% 35% 19% 3	628
March	1st to 10th	Night	25% 18% 36% 19% 3	760
	11th to 20th	Night	21% 18% 39% 17% 4	760
	21st to end	Night	25% 17% 33% 20% 5%	836
April	1st to 10th	Night	24% 17% 34% 22% 3	760
	11th to 20th	Night	23% 17% 34% 20% 6%	718
	21st to end	Night	22% 13% 35% 27% 2 1	570
May	1st to 10th	Night	26% 11% 35% 22% 5% 1	570
	11th to 20th	Night	21% 11% 37% 26% 5% 1	542
	21st to end	Night	21% 8% 33% 29% 9%	411
June	1st to 10th	Night	21% 7% 32% 30% 9% 2	380
	11th to 20th	Night	20% 7% 30% 34% 8% 1	380
	21st to end	Night	20% 7% 31% 35% 8%	380
July	1st to 10th	Night	17% 4 25% 43% 9% 2	370
	11th to 20th	Night	12% 4 24% 44% 15% 1	368
	21st to end	Night	14% 4 26% 44% 12%	416
August	1st to 10th	Night	13% 3 25% 43% 15% 1	521
	11th to 20th	Night	13% 5% 27% 39% 15% 1	562
	21st to end	Night	14% 5% 23% 37% 19% 2	831
September	1st to 10th	Night	15% 4 30% 33% 16% 1	760
	11th to 20th	Night	17% 6% 26% 29% 19% 4	760
	21st to end	Night	19% 7% 27% 31% 14% 2	760
October	1st to 10th	Night	23% 9% 27% 27% 14% 1	760
	11th to 20th	Night	18% 12% 31% 26% 12% 1	760
	21st to end	Night	24% 13% 33% 23% 6%	836
November	1st to 10th	Night	16% 12% 37% 26% 8% 1	760
	11th to 20th	Night	21% 17% 34% 20% 7% 1	760
	21st to end	Night	21% 21% 35% 18% 4 1	760
December	1st to 10th	Night	24% 16% 39% 17% 4	760
	11th to 20th	Night	22% 19% 34% 21% 3	760
	21st to end	Night	25% 17% 37% 19% 2	836

Page generated at 2024-11-03 02:11:28. Version ac07

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