Baird Municipal Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baird Municipal Park clear sky chart from 2005-11-06 to 2024-02-20.

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	14% 7% 3 6% 5% 3 5% 5% 5% 7% 39%	79294
	Night	14% 7% 3 6% 5% 3 4 4 5% 7% 42%	79854
Transparency	Day	43% 7% 11% 21% 15% 3	79009
	Night	41% 6% 10% 22% 17% 4	79659
Seeing	Day	16% 8% 20% 23% 21% 12%	14061
	Night	17% 7% 22% 31% 20% 3	23668

By Month

Percentage Cloud Cover SE (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% 12% 6% 10% 6% 4 5% 5% 5% 5% 27%	2796
	11th to 20th	Day	21% 9% 4 11% 6% 3 5% 3 4 4 31%	2840
	21st to end	Day	26% 10% 6% 6% 5% 2 3 3 4 5% 30%	3353
February	1st to 10th	Day	18% 12% 5% 6% 5% 2 4 4 4 5% 35%	1900
	11th to 20th	Day	20% 10% 4 7% 6% 4 2 4 4 6% 33%	1838
	21st to end	Day	22% 8% 4 7% 5% 3 3 4 4 6% 35%	1480
March	1st to 10th	Day	15% 10% 3 6% 5% 3 4 4 5% 6% 39%	1800
	11th to 20th	Day	20% 10% 4 7% 5% 3 4 3 4 6% 34%	1914
	21st to end	Day	16% 9% 3 6% 6% 3 5% 4 5% 7% 34%	2257
April	1st to 10th	Day	12% 5% 3 5% 5% 3 4 4 4 7% 47%	2160
	11th to 20th	Day	15% 7% 3 5% 5% 2 5% 5% 4 7% 43%	2134
	21st to end	Day	14% 6% 3 6% 5% 3 5% 5% 6% 6% 39%	2227
May	1st to 10th	Day	17% 5% 2 4 5% 2 5% 4 6% 8% 42%	2340
	11th to 20th	Day	15% 7% 3 6% 6% 3 5% 5% 5% 7% 38%	2301
	21st to end	Day	9% 6% 3 6% 6% 4 5% 5% 7% 9% 39%	2531
June	1st to 10th	Day	9% 6% 2 5% 6% 3 5% 5% 7% 9% 42%	2340
	11th to 20th	Day	5% 4 2 5% 6% 4 5% 7% 7% 10% 46%	2452
	21st to end	Day	5% 4 3 5% 6% 4 6% 8% 8% 11% 40%	2520
July	1st to 10th	Day	8% 6% 3 8% 8% 4 7% 7% 8% 10% 32%	2520
	11th to 20th	Day	9% 5% 3 5% 7% 4 6% 6% 9% 10% 36%	2403
	21st to end	Day	9% 4 3 6% 5% 5% 6% 7% 7% 11% 36%	2547
August	1st to 10th	Day	7% 5% 2 7% 7% 5% 7% 7% 8% 11% 35%	2266
	11th to 20th	Day	10% 5% 3 7% 7% 5% 7% 6% 7% 9% 36%	2125
	21st to end	Day	11% 6% 2 5% 6% 4 7% 6% 6% 9% 38%	2376
September	1st to 10th	Day	13% 5% 2 5% 6% 4 6% 6% 6% 7% 40%	2111
	11th to 20th	Day	13% 5% 2 6% 5% 3 5% 5% 5% 7% 43%	1980
	21st to end	Day	11% 6% 3 4 4 3 4 4 6% 6% 50%	1980
October	1st to 10th	Day	11% 4 2 5% 4 2 3 3 4 7% 55%	1980
	11th to 20th	Day	12% 6% 2 4 4 3 3 3 4 6% 53%	1962
	21st to end	Day	18% 5% 2 4 5% 3 4 3 5% 6% 45%	1782
November	1st to 10th	Day	12% 5% 1 4 3 2 3 4 4 6% 57%	1672
	11th to 20th	Day	14% 6% 3 4 4 2 3 4 5% 6% 48%	1710
	21st to end	Day	16% 7% 3 5% 4 3 3 4 5% 5% 45%	1710
December	1st to 10th	Day	23% 9% 3 5% 5% 3 4 4 4 5% 34%	1710
	11th to 20th	Day	17% 9% 3 6% 6% 3 5% 5% 4 5% 36%	2153
	21st to end	Day	18% 13% 4 7% 6% 3 4 4 5% 8% 28%	3124
January	1st to 10th	Night	19% 10% 4 7% 5% 2 3 3 4 6% 37%	4109
	11th to 20th	Night	20% 10% 4 6% 7% 3 4 3 3 5% 34%	4120
	21st to end	Night	21% 12% 4 6% 4 2 3 3 3 5% 35%	4299
February	1st to 10th	Night	20% 10% 4 6% 6% 2 4 4 5% 6% 33%	2280
	11th to 20th	Night	22% 10% 4 7% 5% 3 3 3 4 5% 35%	2213
	21st to end	Night	24% 9% 4 6% 6% 2 4 4 4 5% 31%	1776
March	1st to 10th	Night	16% 6% 4 6% 6% 3 5% 5% 5% 6% 40%	2160
	11th to 20th	Night	19% 8% 3 6% 6% 2 4 4 5% 6% 36%	2044
	21st to end	Night	14% 9% 2 7% 6% 3 5% 5% 5% 8% 38%	2114
April	1st to 10th	Night	12% 5% 2 5% 5% 3 5% 5% 5% 7% 49%	1800
	11th to 20th	Night	16% 7% 2 4 4 2 2 4 5% 7% 48%	1775
	21st to end	Night	14% 6% 2 5% 5% 2 5% 5% 6% 7% 43%	1732
May	1st to 10th	Night	12% 6% 2 5% 6% 3 5% 5% 5% 7% 46%	1620
	11th to 20th	Night	12% 5% 2 4 5% 4 4 6% 6% 9% 44%	1592
	21st to end	Night	5% 4 3 6% 6% 4 5% 6% 7% 11% 42%	1744
June	1st to 10th	Night	7% 5% 2 6% 6% 3 4 5% 5% 9% 46%	1620
	11th to 20th	Night	3 3 1 4 4 3 4 5% 7% 11% 54%	1502
	21st to end	Night	4 4 3 6% 5% 3 5% 7% 7% 13% 44%	1440
July	1st to 10th	Night	9% 5% 3 6% 6% 3 5% 6% 8% 9% 42%	1440
	11th to 20th	Night	7% 4 2 5% 5% 3 5% 6% 8% 12% 43%	1552
	21st to end	Night	6% 3 2 5% 6% 4 6% 6% 9% 11% 40%	1771
August	1st to 10th	Night	7% 4 2 6% 5% 4 5% 5% 6% 10% 46%	1668
	11th to 20th	Night	8% 5% 2 4 5% 3 5% 5% 7% 9% 46%	1776
	21st to end	Night	8% 4 2 5% 5% 3 6% 6% 6% 9% 46%	1980
September	1st to 10th	Night	11% 5% 2 6% 4 3 4 4 5% 7% 47%	1831
	11th to 20th	Night	10% 7% 3 5% 4 3 4 5% 6% 7% 46%	1980
	21st to end	Night	10% 4 2 4 5% 2 4 4 5% 6% 53%	1980
October	1st to 10th	Night	10% 4 2 4 3 2 2 3 4 6% 59%	1980
	11th to 20th	Night	17% 4 2 4 4 3 3 4 5% 6% 48%	1993
	21st to end	Night	16% 7% 2 5% 4 2 3 4 4 7% 47%	2573
November	1st to 10th	Night	12% 5% 2 5% 4 2 3 3 4 5% 54%	2406
	11th to 20th	Night	13% 7% 2 4 3 2 3 4 5% 8% 49%	2470
	21st to end	Night	17% 7% 3 5% 4 2 3 3 5% 5% 45%	2470
December	1st to 10th	Night	21% 10% 4 6% 5% 3 4 4 5% 6% 33%	2470
	11th to 20th	Night	17% 9% 3 6% 4 2 3 4 5% 5% 42%	3042
	21st to end	Night	16% 12% 4 8% 8% 4 5% 4 5% 6% 29%	4532

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	56% 6% 8% 17% 11% 2	2797
	11th to 20th	Day	57% 5% 8% 18% 12% 1	2840
	21st to end	Day	57% 4 8% 22% 9% 1	3353
February	1st to 10th	Day	53% 5% 7% 20% 13% 2	1900
	11th to 20th	Day	55% 4 6% 18% 13% 4	1848
	21st to end	Day	51% 3 10% 16% 14% 6%	1480
March	1st to 10th	Day	46% 4 9% 18% 18% 5%	1800
	11th to 20th	Day	53% 5% 9% 18% 13% 2	1914
	21st to end	Day	50% 6% 11% 19% 12% 1	2257
April	1st to 10th	Day	37% 6% 12% 24% 19% 4	2160
	11th to 20th	Day	40% 6% 7% 21% 22% 4	2134
	21st to end	Day	43% 7% 9% 23% 16% 2	2227
May	1st to 10th	Day	40% 7% 12% 25% 15% 2	2340
	11th to 20th	Day	43% 9% 11% 22% 14% 1	2305
	21st to end	Day	38% 11% 14% 22% 14% 2	2531
June	1st to 10th	Day	37% 9% 12% 24% 16% 2	2340
	11th to 20th	Day	30% 10% 17% 24% 18% 3	2452
	21st to end	Day	33% 10% 18% 20% 15% 4	2520
July	1st to 10th	Day	41% 12% 16% 16% 11% 4	2451
	11th to 20th	Day	40% 10% 18% 18% 11% 3	2330
	21st to end	Day	37% 11% 17% 24% 10% 2	2405
August	1st to 10th	Day	38% 12% 17% 21% 11% 1	2253
	11th to 20th	Day	41% 10% 13% 20% 15% 2	2125
	21st to end	Day	39% 9% 13% 22% 13% 3	2376
September	1st to 10th	Day	40% 10% 11% 19% 17% 3	2111
	11th to 20th	Day	39% 6% 11% 23% 18% 2	1980
	21st to end	Day	33% 6% 10% 24% 22% 5%	1980
October	1st to 10th	Day	30% 5% 10% 23% 26% 6%	1980
	11th to 20th	Day	33% 4 7% 21% 25% 8%	1962
	21st to end	Day	41% 5% 8% 20% 23% 4	1782
November	1st to 10th	Day	30% 3 9% 25% 27% 6%	1672
	11th to 20th	Day	37% 4 8% 23% 23% 5%	1710
	21st to end	Day	41% 4 7% 23% 20% 5%	1710
December	1st to 10th	Day	52% 4 8% 20% 14% 2	1710
	11th to 20th	Day	49% 6% 10% 20% 14% 2	2150
	21st to end	Day	54% 5% 11% 20% 8% 1	3124
January	1st to 10th	Night	48% 5% 8% 23% 14% 1	4109
	11th to 20th	Night	54% 4 6% 15% 16% 4	4120
	21st to end	Night	53% 4 7% 21% 12% 1	4299
February	1st to 10th	Night	52% 5% 9% 18% 15% 1	2280
	11th to 20th	Night	53% 4 6% 18% 15% 4	2214
	21st to end	Night	55% 5% 7% 14% 15% 4	1776
March	1st to 10th	Night	44% 6% 9% 15% 19% 6%	2160
	11th to 20th	Night	49% 6% 8% 20% 15% 2	2044
	21st to end	Night	45% 6% 11% 24% 12% 2	2114
April	1st to 10th	Night	35% 6% 10% 25% 21% 3	1800
	11th to 20th	Night	37% 5% 8% 19% 23% 7%	1775
	21st to end	Night	39% 6% 9% 27% 17% 1	1732
May	1st to 10th	Night	37% 7% 11% 24% 18% 2	1620
	11th to 20th	Night	36% 9% 16% 22% 16% 1	1593
	21st to end	Night	32% 12% 17% 22% 15% 2	1745
June	1st to 10th	Night	34% 7% 13% 27% 15% 3	1620
	11th to 20th	Night	23% 8% 17% 32% 16% 4	1502
	21st to end	Night	29% 9% 19% 27% 12% 5%	1440
July	1st to 10th	Night	34% 11% 17% 22% 13% 3	1400
	11th to 20th	Night	29% 9% 19% 23% 14% 5%	1502
	21st to end	Night	31% 13% 15% 27% 11% 2	1672
August	1st to 10th	Night	32% 9% 15% 29% 15% 1	1657
	11th to 20th	Night	32% 10% 19% 23% 15% 2	1776
	21st to end	Night	31% 10% 15% 25% 15% 4	1980
September	1st to 10th	Night	35% 7% 11% 25% 17% 5%	1831
	11th to 20th	Night	36% 7% 11% 21% 23% 3	1980
	21st to end	Night	31% 4 11% 23% 24% 7%	1980
October	1st to 10th	Night	27% 5% 9% 23% 29% 8%	1980
	11th to 20th	Night	36% 4 8% 22% 22% 7%	1993
	21st to end	Night	37% 4 6% 22% 25% 6%	2573
November	1st to 10th	Night	33% 4 7% 23% 26% 7%	2406
	11th to 20th	Night	34% 4 8% 22% 26% 7%	2470
	21st to end	Night	41% 3 7% 25% 20% 4	2470
December	1st to 10th	Night	52% 4 8% 19% 14% 2	2470
	11th to 20th	Night	43% 5% 8% 21% 20% 3	3044
	21st to end	Night	54% 6% 9% 18% 11% 1	4532

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% 14% 34% 18% 8% 2	270
	11th to 20th	Day	29% 20% 30% 13% 7% 1	270
	21st to end	Day	24% 12% 42% 16% 5%	297
February	1st to 10th	Day	26% 13% 35% 20% 6% 1	270
	11th to 20th	Day	31% 22% 31% 12% 3 1	267
	21st to end	Day	37% 10% 35% 15% 3	198
March	1st to 10th	Day	23% 15% 36% 19% 5% 2	240
	11th to 20th	Day	21% 16% 36% 19% 7% 1	354
	21st to end	Day	23% 14% 30% 20% 12% 2	462
April	1st to 10th	Day	19% 14% 25% 26% 15% 2	420
	11th to 20th	Day	18% 12% 25% 29% 13% 2	412
	21st to end	Day	19% 10% 29% 23% 14% 4	420
May	1st to 10th	Day	19% 9% 25% 26% 17% 5%	423
	11th to 20th	Day	16% 6% 21% 25% 19% 12%	447
	21st to end	Day	12% 4 16% 24% 25% 20%	485
June	1st to 10th	Day	11% 4 15% 24% 26% 20%	450
	11th to 20th	Day	5% 2 15% 26% 32% 20%	562
	21st to end	Day	5% 2 18% 30% 28% 17%	630
July	1st to 10th	Day	8% 3 10% 25% 29% 25%	621
	11th to 20th	Day	9% 4 9% 20% 28% 30%	503
	21st to end	Day	9% 2 8% 26% 30% 25%	488
August	1st to 10th	Day	9% 4 6% 22% 37% 23%	446
	11th to 20th	Day	9% 4 9% 25% 38% 15%	439
	21st to end	Day	14% 1 6% 19% 34% 26%	495
September	1st to 10th	Day	12% 3 9% 20% 33% 22%	450
	11th to 20th	Day	14% 2 10% 20% 32% 22%	450
	21st to end	Day	15% 5% 14% 24% 29% 13%	450
October	1st to 10th	Day	13% 5% 12% 30% 28% 10%	450
	11th to 20th	Day	14% 9% 25% 31% 15% 6%	448
	21st to end	Day	23% 12% 23% 25% 15% 3	297
November	1st to 10th	Day	16% 7% 26% 28% 17% 6%	270
	11th to 20th	Day	14% 12% 36% 24% 14%	270
	21st to end	Day	20% 11% 27% 24% 13% 3	270
December	1st to 10th	Day	26% 17% 24% 24% 9%	270
	11th to 20th	Day	20% 16% 30% 19% 15% 1	270
	21st to end	Day	23% 19% 30% 21% 6% 1	297
January	1st to 10th	Night	23% 14% 31% 27% 6%	760
	11th to 20th	Night	26% 15% 30% 23% 5%	760
	21st to end	Night	19% 12% 39% 27% 3	836
February	1st to 10th	Night	26% 11% 33% 26% 4	760
	11th to 20th	Night	28% 12% 34% 24% 3	742
	21st to end	Night	30% 13% 31% 25% 2	592
March	1st to 10th	Night	20% 12% 31% 32% 5%	720
	11th to 20th	Night	25% 11% 29% 28% 7% 1	720
	21st to end	Night	20% 9% 31% 30% 9%	728
April	1st to 10th	Night	13% 9% 30% 38% 10% 1	540
	11th to 20th	Night	18% 8% 29% 31% 12% 1	533
	21st to end	Night	17% 8% 27% 36% 11% 1	540
May	1st to 10th	Night	12% 4 30% 37% 17% 1	540
	11th to 20th	Night	13% 3 21% 36% 22% 5%	531
	21st to end	Night	6% 1 14% 36% 36% 6%	584
June	1st to 10th	Night	8% 1 17% 37% 32% 5%	540
	11th to 20th	Night	4 2 10% 36% 40% 7%	540
	21st to end	Night	4 2 9% 41% 38% 6%	540
July	1st to 10th	Night	9% 2 6% 30% 44% 8%	525
	11th to 20th	Night	6% 3 9% 26% 46% 10%	522
	21st to end	Night	8% 1 6% 32% 45% 8%	591
August	1st to 10th	Night	8% 1 6% 28% 51% 7%	537
	11th to 20th	Night	7% 2 8% 35% 43% 5%	534
	21st to end	Night	10% 1 4 30% 47% 9%	594
September	1st to 10th	Night	12% 2 8% 30% 42% 6%	571
	11th to 20th	Night	12% 2 11% 30% 39% 6%	720
	21st to end	Night	11% 2 14% 32% 35% 5%	720
October	1st to 10th	Night	11% 4 16% 31% 32% 6%	720
	11th to 20th	Night	18% 6% 19% 35% 19% 2	720
	21st to end	Night	19% 6% 27% 31% 16% 2	792
November	1st to 10th	Night	14% 5% 20% 39% 19% 3	740
	11th to 20th	Night	14% 10% 30% 33% 12%	760
	21st to end	Night	19% 10% 25% 34% 11% 1	760
December	1st to 10th	Night	27% 10% 28% 28% 7%	760
	11th to 20th	Night	24% 8% 29% 32% 7%	760
	21st to end	Night	25% 10% 31% 28% 6%	836

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