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 2024-01-12.

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% 6% 3 5% 5% 3 4 5% 5% 7% 40%	74805
	Night	17% 7% 3 5% 5% 3 4 4 5% 6% 41%	74901
Transparency	Day	43% 6% 12% 22% 15% 3	74510
	Night	44% 6% 12% 22% 15% 2	74730
Seeing	Day	21% 15% 33% 22% 8% 2	13914
	Night	21% 13% 33% 25% 7% 1	22901

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% 8% 3 6% 5% 3 4 4 5% 6% 43%	1517
	11th to 20th	Day	19% 6% 3 4 5% 3 5% 4 5% 7% 39%	1448
	21st to end	Day	14% 7% 2 4 6% 4 5% 4 5% 5% 44%	1584
February	1st to 10th	Day	19% 8% 4 5% 5% 3 5% 6% 5% 6% 35%	1661
	11th to 20th	Day	14% 7% 2 7% 5% 3 5% 5% 5% 7% 39%	1748
	21st to end	Day	17% 10% 3 5% 6% 3 4 5% 5% 5% 36%	1480
March	1st to 10th	Day	17% 9% 2 5% 5% 3 4 5% 5% 8% 37%	1797
	11th to 20th	Day	17% 7% 3 6% 5% 3 4 4 5% 7% 39%	1907
	21st to end	Day	18% 8% 4 6% 5% 2 4 4 4 5% 39%	2278
April	1st to 10th	Day	19% 8% 3 6% 5% 2 4 3 5% 6% 38%	2160
	11th to 20th	Day	17% 6% 2 4 6% 3 6% 5% 5% 7% 39%	2164
	21st to end	Day	23% 6% 3 5% 6% 4 4 4 5% 7% 34%	2340
May	1st to 10th	Day	25% 8% 2 5% 5% 3 4 4 4 7% 32%	2340
	11th to 20th	Day	18% 6% 3 5% 5% 3 4 4 5% 8% 40%	2333
	21st to end	Day	15% 5% 3 5% 5% 3 4 4 4 8% 44%	2725
June	1st to 10th	Day	20% 6% 2 5% 5% 3 6% 4 6% 8% 34%	2520
	11th to 20th	Day	17% 6% 2 5% 5% 3 5% 5% 5% 8% 39%	2520
	21st to end	Day	18% 6% 2 5% 6% 3 6% 5% 7% 8% 34%	2520
July	1st to 10th	Day	15% 5% 3 5% 4 3 5% 6% 7% 8% 40%	2520
	11th to 20th	Day	13% 6% 2 5% 5% 3 5% 5% 6% 10% 40%	2520
	21st to end	Day	12% 4 2 6% 5% 3 6% 6% 7% 9% 40%	2744
August	1st to 10th	Day	10% 5% 3 6% 6% 3 6% 6% 7% 9% 38%	2351
	11th to 20th	Day	12% 6% 2 6% 5% 3 5% 6% 7% 9% 40%	2304
	21st to end	Day	12% 4 2 4 4 3 4 6% 6% 8% 46%	2377
September	1st to 10th	Day	13% 5% 2 5% 4 3 5% 4 6% 7% 46%	2147
	11th to 20th	Day	15% 6% 2 4 4 2 3 4 4 5% 51%	1980
	21st to end	Day	17% 6% 2 4 4 3 3 4 5% 7% 46%	1980
October	1st to 10th	Day	23% 5% 2 5% 5% 3 4 4 4 5% 40%	1980
	11th to 20th	Day	15% 5% 2 4 4 3 4 5% 5% 7% 45%	1755
	21st to end	Day	22% 7% 2 5% 5% 3 4 4 5% 6% 39%	1782
November	1st to 10th	Day	16% 6% 3 4 5% 2 3 3 4 5% 49%	1671
	11th to 20th	Day	19% 6% 3 4 3 2 4 4 4 6% 45%	1710
	21st to end	Day	19% 6% 3 4 4 3 3 4 5% 6% 43%	1710
December	1st to 10th	Day	18% 8% 3 6% 5% 3 4 4 5% 6% 39%	1554
	11th to 20th	Day	21% 6% 2 4 4 2 4 3 3 5% 44%	1906
	21st to end	Day	22% 10% 4 5% 5% 3 4 4 4 5% 34%	2772
January	1st to 10th	Night	16% 8% 3 5% 4 3 4 4 5% 6% 43%	2649
	11th to 20th	Night	18% 9% 4 5% 6% 3 4 5% 5% 7% 35%	2541
	21st to end	Night	13% 8% 3 6% 5% 4 5% 4 5% 6% 41%	2772
February	1st to 10th	Night	17% 9% 3 6% 5% 3 5% 5% 5% 6% 37%	2296
	11th to 20th	Night	15% 8% 4 5% 5% 3 5% 4 5% 6% 40%	2098
	21st to end	Night	18% 8% 2 4 4 2 4 4 5% 6% 42%	1776
March	1st to 10th	Night	16% 8% 3 6% 5% 3 4 4 4 6% 42%	2150
	11th to 20th	Night	17% 7% 4 7% 5% 3 5% 4 4 5% 38%	2051
	21st to end	Night	18% 8% 3 5% 5% 3 3 3 4 5% 42%	2075
April	1st to 10th	Night	19% 8% 3 6% 5% 3 4 4 5% 6% 37%	1800
	11th to 20th	Night	20% 7% 2 5% 4 3 3 4 4 6% 41%	1744
	21st to end	Night	22% 6% 3 5% 5% 4 5% 4 5% 5% 37%	1620
May	1st to 10th	Night	22% 8% 3 6% 6% 3 4 5% 5% 6% 33%	1620
	11th to 20th	Night	19% 5% 2 6% 5% 3 5% 6% 6% 7% 36%	1575
	21st to end	Night	17% 7% 3 6% 5% 4 3 5% 5% 7% 38%	1550
June	1st to 10th	Night	19% 7% 2 6% 7% 3 5% 4 5% 7% 35%	1440
	11th to 20th	Night	20% 7% 2 5% 4 3 4 5% 5% 9% 36%	1440
	21st to end	Night	16% 6% 2 5% 5% 2 5% 5% 6% 8% 39%	1440
July	1st to 10th	Night	16% 5% 2 6% 5% 3 5% 5% 6% 8% 39%	1440
	11th to 20th	Night	12% 6% 3 7% 5% 4 5% 5% 6% 10% 39%	1440
	21st to end	Night	13% 5% 2 5% 6% 3 5% 5% 5% 9% 42%	1574
August	1st to 10th	Night	10% 5% 2 4 5% 4 6% 6% 6% 8% 45%	1567
	11th to 20th	Night	12% 6% 3 6% 6% 4 7% 6% 6% 8% 36%	1596
	21st to end	Night	13% 5% 2 4 4 3 4 4 5% 8% 47%	1975
September	1st to 10th	Night	14% 5% 3 4 4 3 3 3 5% 8% 47%	1813
	11th to 20th	Night	14% 5% 2 4 3 2 4 2 4 7% 53%	1980
	21st to end	Night	16% 5% 2 5% 4 2 3 4 6% 7% 46%	1980
October	1st to 10th	Night	22% 6% 2 5% 5% 2 3 4 4 5% 40%	1980
	11th to 20th	Night	16% 5% 2 5% 5% 3 4 4 6% 6% 45%	2204
	21st to end	Night	23% 7% 3 5% 4 3 4 4 5% 6% 38%	2574
November	1st to 10th	Night	15% 5% 2 5% 5% 3 4 4 4 6% 47%	2407
	11th to 20th	Night	18% 6% 2 4 4 3 4 4 4 6% 46%	2470
	21st to end	Night	17% 6% 3 4 4 3 4 4 5% 6% 44%	2470
December	1st to 10th	Night	19% 8% 3 6% 4 3 5% 4 4 5% 39%	2622
	11th to 20th	Night	21% 5% 2 4 4 3 4 4 6% 6% 40%	3288
	21st to end	Night	21% 9% 3 6% 5% 3 4 4 4 6% 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	43% 4 10% 26% 14% 2	1518
	11th to 20th	Day	46% 6% 14% 19% 12% 3	1448
	21st to end	Day	41% 4 12% 25% 15% 3	1584
February	1st to 10th	Day	48% 6% 12% 18% 13% 2	1661
	11th to 20th	Day	45% 6% 12% 21% 14% 3	1757
	21st to end	Day	49% 5% 10% 19% 14% 3	1480
March	1st to 10th	Day	45% 5% 12% 21% 13% 4	1800
	11th to 20th	Day	44% 4 11% 20% 16% 4	1907
	21st to end	Day	47% 4 8% 18% 16% 7%	2278
April	1st to 10th	Day	47% 5% 9% 18% 17% 4	2160
	11th to 20th	Day	44% 5% 12% 20% 16% 3	2164
	21st to end	Day	48% 6% 7% 18% 16% 4	2340
May	1st to 10th	Day	52% 5% 8% 19% 13% 2	2340
	11th to 20th	Day	43% 7% 10% 19% 18% 3	2337
	21st to end	Day	40% 7% 15% 23% 13% 2	2725
June	1st to 10th	Day	48% 8% 13% 20% 11% 1	2520
	11th to 20th	Day	43% 6% 14% 19% 16% 2	2520
	21st to end	Day	45% 8% 13% 23% 10% 1	2520
July	1st to 10th	Day	38% 8% 12% 23% 16% 2	2450
	11th to 20th	Day	39% 7% 14% 26% 12% 1	2445
	21st to end	Day	38% 8% 15% 23% 13% 3	2591
August	1st to 10th	Day	39% 9% 15% 23% 13% 1	2337
	11th to 20th	Day	39% 9% 14% 25% 12% 1	2304
	21st to end	Day	33% 8% 13% 24% 19% 2	2377
September	1st to 10th	Day	36% 6% 13% 24% 20% 1	2147
	11th to 20th	Day	36% 4 9% 26% 23% 2	1980
	21st to end	Day	39% 6% 9% 23% 22% 2	1980
October	1st to 10th	Day	46% 6% 10% 21% 14% 4	1980
	11th to 20th	Day	37% 6% 12% 30% 14% 2	1755
	21st to end	Day	46% 6% 11% 21% 13% 3	1782
November	1st to 10th	Day	39% 5% 12% 26% 16% 2	1671
	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	42% 4 11% 24% 16% 2	2649
	11th to 20th	Night	49% 6% 14% 20% 8% 2	2541
	21st to end	Night	44% 4 11% 20% 18% 3	2772
February	1st to 10th	Night	48% 5% 12% 19% 13% 3	2296
	11th to 20th	Night	46% 5% 11% 21% 14% 4	2100
	21st to end	Night	43% 5% 9% 25% 15% 4	1776
March	1st to 10th	Night	44% 5% 9% 22% 16% 4	2160
	11th to 20th	Night	47% 5% 10% 16% 17% 4	2052
	21st to end	Night	46% 4 8% 17% 20% 5%	2075
April	1st to 10th	Night	47% 5% 10% 18% 17% 3	1800
	11th to 20th	Night	45% 4 9% 21% 19% 3	1744
	21st to end	Night	48% 5% 11% 18% 15% 4	1620
May	1st to 10th	Night	52% 5% 9% 17% 13% 3	1620
	11th to 20th	Night	45% 7% 13% 17% 15% 3	1576
	21st to end	Night	45% 8% 13% 21% 13% 1	1551
June	1st to 10th	Night	49% 6% 11% 22% 11%	1440
	11th to 20th	Night	44% 7% 14% 19% 14% 2	1440
	21st to end	Night	40% 10% 14% 22% 14% 1	1440
July	1st to 10th	Night	41% 8% 13% 22% 15% 1	1400
	11th to 20th	Night	40% 8% 15% 27% 10% 1	1392
	21st to end	Night	37% 8% 13% 28% 11% 2	1486
August	1st to 10th	Night	34% 10% 15% 25% 15% 2	1557
	11th to 20th	Night	42% 10% 15% 20% 13% 1	1596
	21st to end	Night	35% 7% 12% 25% 20% 1	1975
September	1st to 10th	Night	36% 6% 12% 25% 19% 1	1813
	11th to 20th	Night	34% 5% 10% 23% 26% 2	1980
	21st to end	Night	38% 5% 8% 26% 20% 2	1980
October	1st to 10th	Night	45% 5% 12% 22% 12% 3	1980
	11th to 20th	Night	38% 7% 13% 28% 13% 1	2204
	21st to end	Night	47% 5% 12% 21% 13% 2	2574
November	1st to 10th	Night	38% 6% 12% 22% 19% 3	2407
	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% 23% 31% 19% 3	180
	11th to 20th	Day	22% 27% 35% 12% 3 1	162
	21st to end	Day	20% 26% 36% 13% 5%	176
February	1st to 10th	Day	29% 23% 35% 13% 1	333
	11th to 20th	Day	26% 24% 36% 12% 2	416
	21st to end	Day	23% 21% 38% 15% 3	346
March	1st to 10th	Day	23% 19% 40% 15% 3	420
	11th to 20th	Day	24% 23% 37% 13% 2 1	420
	21st to end	Day	27% 20% 34% 12% 5% 2	462
April	1st to 10th	Day	26% 24% 29% 15% 5% 1	420
	11th to 20th	Day	24% 21% 34% 15% 6%	412
	21st to end	Day	27% 15% 35% 19% 3 1	420
May	1st to 10th	Day	30% 19% 32% 12% 6% 1	423
	11th to 20th	Day	18% 15% 41% 20% 4 1	447
	21st to end	Day	18% 12% 33% 28% 7% 1	485
June	1st to 10th	Day	20% 10% 37% 21% 11% 1	450
	11th to 20th	Day	14% 14% 39% 26% 7% 2	450
	21st to end	Day	18% 9% 37% 25% 8% 2	450
July	1st to 10th	Day	18% 5% 30% 31% 13% 3	445
	11th to 20th	Day	14% 7% 30% 32% 14% 2	444
	21st to end	Day	11% 5% 35% 38% 10% 1	488
August	1st to 10th	Day	10% 7% 30% 37% 13% 2	446
	11th to 20th	Day	15% 6% 29% 31% 15% 3	439
	21st to end	Day	14% 7% 30% 31% 13% 4	495
September	1st to 10th	Day	17% 9% 28% 27% 16% 4	450
	11th to 20th	Day	19% 12% 30% 19% 14% 6%	450
	21st to end	Day	17% 12% 32% 25% 10% 5%	450
October	1st to 10th	Day	26% 12% 26% 22% 11% 3	450
	11th to 20th	Day	19% 15% 30% 25% 9% 2	392
	21st to end	Day	27% 12% 34% 18% 8% 1	396
November	1st to 10th	Day	16% 16% 34% 22% 9% 2	365
	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	24% 19% 37% 17% 2	727
	21st to end	Night	20% 20% 37% 19% 4	792
February	1st to 10th	Night	23% 18% 36% 21% 1	720
	11th to 20th	Night	21% 20% 41% 15% 3	703
	21st to end	Night	24% 18% 36% 19% 3	592
March	1st to 10th	Night	24% 18% 37% 19% 2	720
	11th to 20th	Night	22% 18% 39% 17% 5%	720
	21st to end	Night	23% 17% 33% 21% 5%	792
April	1st to 10th	Night	23% 18% 34% 22% 3	720
	11th to 20th	Night	23% 16% 34% 21% 6%	680
	21st to end	Night	23% 12% 35% 27% 2 1	540
May	1st to 10th	Night	26% 11% 36% 21% 5% 1	540
	11th to 20th	Night	21% 12% 37% 25% 5% 1	514
	21st to end	Night	21% 8% 33% 29% 10%	389
June	1st to 10th	Night	21% 7% 31% 30% 9% 2	360
	11th to 20th	Night	21% 6% 30% 34% 8% 1	360
	21st to end	Night	19% 6% 30% 37% 8%	360
July	1st to 10th	Night	17% 3 24% 44% 10% 2	350
	11th to 20th	Night	12% 3 24% 45% 15% 1	348
	21st to end	Night	14% 4 26% 44% 12% 1	394
August	1st to 10th	Night	12% 3 26% 43% 15% 1	493
	11th to 20th	Night	13% 4 26% 40% 16% 1	532
	21st to end	Night	14% 5% 23% 37% 18% 2	787
September	1st to 10th	Night	15% 4 30% 33% 17% 1	720
	11th to 20th	Night	16% 6% 28% 28% 19% 3	720
	21st to end	Night	18% 7% 27% 31% 15% 3	720
October	1st to 10th	Night	24% 9% 27% 26% 13% 2	720
	11th to 20th	Night	18% 12% 31% 26% 12% 1	720
	21st to end	Night	25% 12% 33% 23% 6%	792
November	1st to 10th	Night	17% 12% 36% 26% 8% 1	740
	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 2024-01-09 07:14:44. Version ac07

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