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 2026-07-16.

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	13% 8% 3 7% 5% 5% 5% 4 6% 7% 38%	138800
	Night	13% 8% 3 7% 4 4 4 3 5% 7% 41%	133891
Transparency	Day	42% 6% 11% 22% 16% 3	142493
	Night	41% 5% 10% 22% 18% 4	138260
Seeing	Day	15% 9% 22% 23% 20% 11%	17344
	Night	16% 7% 23% 31% 20% 3	26733

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	16% 12% 6% 11% 5% 4 5% 3 4 5% 29%	5218
	11th to 20th	Day	14% 8% 4 11% 4 3 3 2 3 4 44%	5280
	21st to end	Day	22% 8% 4 7% 4 4 3 3 5% 6% 33%	6229
February	1st to 10th	Day	17% 12% 4 7% 4 4 3 3 4 5% 35%	2100
	11th to 20th	Day	20% 11% 4 8% 5% 5% 3 3 4 6% 32%	2048
	21st to end	Day	20% 8% 3 7% 5% 4 3 3 4 6% 37%	1730
March	1st to 10th	Day	16% 12% 4 8% 5% 5% 4 3 4 6% 34%	4580
	11th to 20th	Day	13% 8% 3 6% 4 4 3 3 4 6% 46%	4936
	21st to end	Day	11% 8% 3 7% 5% 4 4 3 5% 7% 43%	5805
April	1st to 10th	Day	12% 5% 2 6% 4 4 4 4 5% 7% 46%	2520
	11th to 20th	Day	13% 7% 2 6% 3 3 5% 4 5% 7% 43%	2494
	21st to end	Day	13% 7% 3 7% 5% 5% 5% 4 6% 7% 40%	2599
May	1st to 10th	Day	18% 8% 3 7% 4 4 5% 4 7% 9% 32%	7616
	11th to 20th	Day	12% 8% 3 9% 6% 5% 5% 4 5% 7% 36%	7626
	21st to end	Day	17% 10% 4 10% 6% 5% 5% 3 5% 6% 30%	8391
June	1st to 10th	Day	9% 6% 2 6% 5% 5% 5% 4 7% 9% 41%	2730
	11th to 20th	Day	5% 5% 2 6% 5% 5% 6% 5% 7% 10% 44%	2861
	21st to end	Day	5% 5% 2 5% 6% 6% 5% 7% 8% 12% 39%	2940
July	1st to 10th	Day	6% 5% 2 7% 6% 6% 6% 5% 7% 10% 38%	6500
	11th to 20th	Day	7% 6% 3 6% 6% 6% 7% 6% 10% 12% 31%	6115
	21st to end	Day	12% 7% 3 9% 6% 6% 6% 5% 8% 11% 27%	6424
August	1st to 10th	Day	5% 3 2 6% 4 5% 5% 5% 7% 11% 48%	4113
	11th to 20th	Day	6% 5% 2 6% 5% 6% 6% 5% 8% 12% 39%	3849
	21st to end	Day	6% 4 2 4 4 4 5% 4 6% 8% 53%	4312
September	1st to 10th	Day	12% 6% 2 6% 5% 5% 6% 4 6% 7% 40%	2345
	11th to 20th	Day	12% 5% 2 7% 4 5% 5% 4 5% 7% 44%	2200
	21st to end	Day	11% 6% 2 6% 4 4 4 3 6% 6% 47%	2200
October	1st to 10th	Day	10% 5% 2 6% 3 3 3 3 4 7% 55%	2200
	11th to 20th	Day	11% 6% 2 4 3 3 3 2 4 6% 56%	2179
	21st to end	Day	17% 5% 2 6% 4 4 3 2 5% 6% 46%	1980
November	1st to 10th	Day	11% 6% 1 6% 3 3 3 3 4 6% 54%	1852
	11th to 20th	Day	14% 7% 2 5% 3 3 3 3 5% 7% 48%	1890
	21st to end	Day	15% 8% 3 6% 4 4 4 3 5% 5% 44%	1890
December	1st to 10th	Day	15% 8% 3 6% 5% 4 4 3 5% 5% 42%	3020
	11th to 20th	Day	18% 11% 6% 9% 5% 4 4 3 4 5% 31%	3463
	21st to end	Day	17% 13% 5% 9% 5% 4 5% 3 6% 7% 27%	4565
January	1st to 10th	Night	16% 10% 4 9% 4 4 3 3 4 5% 40%	7635
	11th to 20th	Night	16% 9% 3 6% 5% 4 3 2 3 4 44%	7680
	21st to end	Night	18% 12% 4 8% 4 4 3 2 4 4 37%	7948
February	1st to 10th	Night	19% 10% 4 8% 5% 3 4 3 5% 6% 32%	2520
	11th to 20th	Night	22% 10% 4 8% 4 4 3 2 4 4 34%	2458
	21st to end	Night	23% 9% 4 7% 4 3 3 3 4 5% 34%	2076
March	1st to 10th	Night	19% 10% 4 7% 4 4 4 3 5% 6% 34%	5493
	11th to 20th	Night	12% 6% 2 5% 4 4 4 3 6% 6% 49%	5242
	21st to end	Night	12% 8% 2 8% 5% 4 4 4 5% 7% 41%	5409
April	1st to 10th	Night	12% 6% 2 7% 4 4 5% 3 5% 7% 46%	2100
	11th to 20th	Night	14% 7% 2 4 3 3 3 4 5% 7% 48%	2075
	21st to end	Night	14% 7% 2 6% 5% 4 4 4 5% 7% 43%	2020
May	1st to 10th	Night	14% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	5237
	11th to 20th	Night	12% 8% 3 8% 5% 6% 5% 4 6% 8% 35%	5234
	21st to end	Night	15% 9% 3 9% 6% 6% 5% 4 6% 8% 30%	5761
June	1st to 10th	Night	7% 5% 3 7% 5% 4 4 5% 6% 9% 44%	1890
	11th to 20th	Night	4 4 1 5% 4 4 4 4 7% 11% 52%	1751
	21st to end	Night	4 4 2 6% 5% 4 4 5% 8% 12% 45%	1680
July	1st to 10th	Night	6% 5% 2 6% 5% 5% 6% 5% 8% 10% 43%	3698
	11th to 20th	Night	6% 5% 2 7% 5% 4 7% 5% 8% 13% 37%	3939
	21st to end	Night	8% 7% 3 9% 6% 7% 6% 5% 9% 11% 28%	4427
August	1st to 10th	Night	5% 3 2 5% 3 4 4 3 6% 9% 57%	3032
	11th to 20th	Night	6% 4 2 5% 4 4 5% 4 8% 11% 48%	3200
	21st to end	Night	5% 3 1 4 4 3 5% 4 6% 8% 57%	3586
September	1st to 10th	Night	10% 5% 2 6% 3 4 4 3 5% 7% 48%	2035
	11th to 20th	Night	9% 7% 2 5% 4 4 5% 4 6% 7% 46%	2200
	21st to end	Night	12% 5% 2 5% 5% 4 4 3 5% 6% 51%	2200
October	1st to 10th	Night	10% 4 2 4 3 3 2 3 4 5% 60%	2200
	11th to 20th	Night	15% 4 2 4 4 3 3 3 4 6% 52%	2215
	21st to end	Night	15% 7% 2 5% 3 2 3 3 4 7% 48%	2859
November	1st to 10th	Night	12% 6% 2 6% 4 3 3 3 5% 5% 53%	2666
	11th to 20th	Night	13% 8% 2 5% 3 2 3 3 5% 7% 49%	2730
	21st to end	Night	17% 8% 3 5% 4 3 3 3 5% 5% 45%	2730
December	1st to 10th	Night	18% 10% 3 9% 4 4 4 2 4 4 38%	4380
	11th to 20th	Night	21% 10% 3 7% 3 3 3 3 4 4 39%	4952
	21st to end	Night	14% 12% 5% 10% 6% 5% 5% 4 5% 6% 28%	6633

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	57% 4 11% 18% 9% 1	5219
	11th to 20th	Day	45% 3 5% 22% 23% 2	5280
	21st to end	Day	52% 3 7% 22% 12% 4	6229
February	1st to 10th	Day	53% 5% 7% 21% 13% 2	2100
	11th to 20th	Day	55% 4 7% 18% 13% 3	2058
	21st to end	Day	49% 3 10% 18% 15% 5%	1730
March	1st to 10th	Day	52% 4 6% 14% 16% 8%	4580
	11th to 20th	Day	40% 4 8% 22% 20% 7%	4936
	21st to end	Day	41% 5% 9% 30% 15% 1	5807
April	1st to 10th	Day	37% 6% 12% 24% 18% 3	2520
	11th to 20th	Day	39% 6% 7% 23% 21% 4	2494
	21st to end	Day	43% 6% 10% 24% 16% 2	2599
May	1st to 10th	Day	46% 7% 13% 21% 11% 1	7651
	11th to 20th	Day	45% 8% 12% 22% 13% 1	7630
	21st to end	Day	54% 7% 8% 17% 12% 2	8405
June	1st to 10th	Day	38% 9% 11% 23% 17% 2	2730
	11th to 20th	Day	31% 9% 16% 23% 18% 2	2861
	21st to end	Day	33% 10% 18% 20% 15% 4	2940
July	1st to 10th	Day	37% 10% 16% 24% 12% 2	6431
	11th to 20th	Day	39% 10% 20% 24% 5% 1	6042
	21st to end	Day	47% 9% 18% 21% 4 1	6240
August	1st to 10th	Day	28% 8% 15% 32% 16% 1	4100
	11th to 20th	Day	35% 7% 15% 25% 16% 1	3885
	21st to end	Day	28% 7% 10% 34% 20% 2	4311
September	1st to 10th	Day	39% 9% 10% 19% 18% 4	2345
	11th to 20th	Day	38% 6% 10% 24% 19% 2	2200
	21st to end	Day	35% 7% 11% 22% 21% 4	2200
October	1st to 10th	Day	23% 4 7% 18% 41% 8%	3590
	11th to 20th	Day	23% 3 7% 24% 31% 12%	3523
	21st to end	Day	31% 3 7% 24% 26% 8%	3180
November	1st to 10th	Day	34% 3 8% 24% 26% 5%	1852
	11th to 20th	Day	37% 4 8% 24% 22% 5%	1890
	21st to end	Day	42% 4 7% 23% 19% 4	1890
December	1st to 10th	Day	44% 3 6% 25% 20% 1	3020
	11th to 20th	Day	55% 4 9% 18% 11% 2	3460
	21st to end	Day	55% 5% 11% 21% 7% 1	4565
January	1st to 10th	Night	47% 4 15% 22% 12% 1	7636
	11th to 20th	Night	46% 3 5% 20% 24% 4	7680
	21st to end	Night	52% 3 7% 18% 15% 5%	7948
February	1st to 10th	Night	53% 5% 9% 18% 14% 1	2520
	11th to 20th	Night	54% 4 6% 18% 14% 4	2459
	21st to end	Night	52% 4 8% 15% 17% 4	2076
March	1st to 10th	Night	50% 5% 7% 14% 19% 5%	5493
	11th to 20th	Night	35% 4 8% 21% 20% 12%	5242
	21st to end	Night	43% 4 9% 28% 14% 2	5409
April	1st to 10th	Night	38% 5% 10% 24% 20% 3	2100
	11th to 20th	Night	35% 5% 9% 21% 23% 6%	2075
	21st to end	Night	40% 6% 9% 26% 17% 1	2020
May	1st to 10th	Night	47% 7% 12% 21% 12% 1	5264
	11th to 20th	Night	45% 8% 13% 16% 16% 1	5235
	21st to end	Night	49% 9% 13% 17% 11% 1	5771
June	1st to 10th	Night	34% 7% 13% 27% 16% 3	1890
	11th to 20th	Night	25% 8% 16% 31% 18% 3	1751
	21st to end	Night	28% 9% 18% 27% 14% 4	1680
July	1st to 10th	Night	33% 9% 18% 26% 13% 1	3660
	11th to 20th	Night	35% 10% 22% 25% 6% 2	3892
	21st to end	Night	45% 11% 19% 20% 5% 1	4297
August	1st to 10th	Night	24% 7% 11% 38% 20% 1	3021
	11th to 20th	Night	28% 7% 20% 30% 14% 1	3230
	21st to end	Night	23% 7% 11% 34% 23% 2	3586
September	1st to 10th	Night	35% 7% 11% 23% 18% 6%	2035
	11th to 20th	Night	35% 7% 11% 21% 24% 3	2200
	21st to end	Night	34% 5% 11% 21% 23% 6%	2200
October	1st to 10th	Night	23% 4 7% 19% 37% 11%	3590
	11th to 20th	Night	22% 3 6% 24% 31% 15%	3598
	21st to end	Night	26% 3 7% 24% 31% 10%	4609
November	1st to 10th	Night	34% 4 8% 24% 24% 6%	2666
	11th to 20th	Night	35% 3 8% 22% 26% 6%	2730
	21st to end	Night	42% 3 7% 25% 18% 4	2730
December	1st to 10th	Night	50% 3 6% 17% 22% 2	4380
	11th to 20th	Night	48% 4 6% 22% 18% 2	4954
	21st to end	Night	55% 6% 9% 20% 9% 1	6633

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	23% 15% 32% 20% 8% 2	330
	11th to 20th	Day	25% 22% 31% 14% 6% 1	330
	21st to end	Day	24% 14% 42% 16% 5%	363
February	1st to 10th	Day	25% 14% 35% 20% 5% 1	330
	11th to 20th	Day	29% 23% 31% 12% 3 1	330
	21st to end	Day	31% 14% 34% 16% 4	273
March	1st to 10th	Day	24% 17% 34% 19% 5% 2	330
	11th to 20th	Day	20% 17% 37% 18% 6%	464
	21st to end	Day	21% 15% 33% 21% 9% 1	594
April	1st to 10th	Day	19% 16% 26% 26% 13% 1	540
	11th to 20th	Day	17% 13% 28% 28% 12% 2	532
	21st to end	Day	17% 10% 30% 26% 13% 4	540
May	1st to 10th	Day	20% 10% 26% 25% 15% 4	543
	11th to 20th	Day	16% 7% 24% 24% 19% 10%	567
	21st to end	Day	12% 6% 19% 25% 22% 16%	617
June	1st to 10th	Day	11% 4 18% 25% 25% 18%	570
	11th to 20th	Day	6% 3 16% 26% 32% 18%	701
	21st to end	Day	5% 2 17% 29% 28% 18%	780
July	1st to 10th	Day	8% 3 11% 24% 31% 24%	771
	11th to 20th	Day	8% 3 10% 20% 29% 29%	612
	21st to end	Day	10% 3 7% 24% 30% 25%	576
August	1st to 10th	Day	9% 3 7% 23% 36% 23%	526
	11th to 20th	Day	8% 4 10% 25% 37% 16%	519
	21st to end	Day	13% 1 7% 20% 33% 27%	583
September	1st to 10th	Day	12% 3 11% 21% 33% 20%	530
	11th to 20th	Day	13% 3 9% 20% 33% 22%	530
	21st to end	Day	16% 5% 14% 24% 28% 12%	530
October	1st to 10th	Day	13% 5% 12% 30% 29% 11%	530
	11th to 20th	Day	13% 9% 24% 30% 18% 7%	527
	21st to end	Day	21% 11% 26% 26% 13% 2	363
November	1st to 10th	Day	17% 8% 26% 29% 15% 5%	330
	11th to 20th	Day	15% 12% 36% 24% 13%	330
	21st to end	Day	19% 13% 30% 23% 12% 3	330
December	1st to 10th	Day	23% 17% 28% 24% 8%	330
	11th to 20th	Day	19% 16% 32% 18% 13% 1	330
	21st to end	Day	22% 19% 30% 21% 7% 1	363
January	1st to 10th	Night	22% 13% 31% 28% 5%	840
	11th to 20th	Night	25% 15% 32% 24% 4	840
	21st to end	Night	19% 12% 38% 28% 3	924
February	1st to 10th	Night	25% 11% 34% 26% 4	840
	11th to 20th	Night	29% 13% 33% 24% 2	823
	21st to end	Night	28% 13% 32% 25% 2	692
March	1st to 10th	Night	20% 12% 33% 30% 5%	840
	11th to 20th	Night	23% 11% 31% 28% 6% 1	840
	21st to end	Night	19% 10% 34% 29% 8%	848
April	1st to 10th	Night	14% 10% 30% 36% 9% 1	630
	11th to 20th	Night	17% 8% 31% 31% 11% 1	623
	21st to end	Night	17% 8% 27% 36% 11% 1	630
May	1st to 10th	Night	13% 4 30% 37% 15% 1	630
	11th to 20th	Night	13% 4 22% 36% 21% 4	621
	21st to end	Night	8% 2 16% 37% 32% 5%	683
June	1st to 10th	Night	8% 2 17% 39% 30% 4	630
	11th to 20th	Night	5% 2 11% 37% 39% 6%	630
	21st to end	Night	4 2 9% 39% 40% 6%	630
July	1st to 10th	Night	9% 2 7% 29% 45% 8%	615
	11th to 20th	Night	7% 3 9% 27% 45% 10%	597
	21st to end	Night	9% 1 6% 31% 45% 8%	657
August	1st to 10th	Night	8% 1 5% 27% 51% 7%	597
	11th to 20th	Night	7% 2 8% 35% 43% 6%	594
	21st to end	Night	9% 1 4 31% 47% 8%	660
September	1st to 10th	Night	11% 2 8% 31% 41% 6%	635
	11th to 20th	Night	11% 2 10% 30% 40% 6%	800
	21st to end	Night	13% 2 14% 32% 34% 5%	800
October	1st to 10th	Night	11% 4 15% 31% 33% 6%	800
	11th to 20th	Night	17% 6% 19% 36% 21% 2	800
	21st to end	Night	18% 6% 27% 32% 16% 2	880
November	1st to 10th	Night	15% 5% 21% 39% 18% 2	820
	11th to 20th	Night	15% 10% 30% 34% 11%	840
	21st to end	Night	20% 10% 26% 33% 10% 1	840
December	1st to 10th	Night	27% 10% 28% 29% 6%	840
	11th to 20th	Night	24% 8% 29% 32% 7%	840
	21st to end	Night	24% 11% 31% 28% 6%	924

Page generated at 2026-07-13 02:14:47. Version ac07

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