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 2024-10-20.

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	13% 7% 3 7% 5% 4 5% 4 6% 7% 39%	101451
	Night	14% 8% 3 6% 4 4 4 3 5% 7% 42%	97178
Transparency	Day	42% 7% 11% 23% 15% 3	101252
	Night	40% 6% 10% 23% 17% 3	97047
Seeing	Day	16% 8% 20% 23% 21% 11%	15040
	Night	16% 7% 22% 31% 20% 3	24475

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% 13% 6% 11% 5% 5% 5% 4 5% 5% 27%	2796
	11th to 20th	Day	21% 10% 4 12% 4 4 5% 2 4 4 31%	2840
	21st to end	Day	26% 11% 6% 7% 4 3 3 3 4 5% 30%	3353
February	1st to 10th	Day	18% 12% 4 7% 4 4 4 3 4 5% 35%	1900
	11th to 20th	Day	20% 11% 4 8% 5% 4 3 3 4 6% 33%	1848
	21st to end	Day	21% 8% 3 7% 5% 4 3 3 4 6% 35%	1570
March	1st to 10th	Day	21% 13% 3 7% 4 4 4 3 4 6% 31%	3120
	11th to 20th	Day	14% 8% 3 6% 4 4 3 3 4 6% 46%	3372
	21st to end	Day	13% 8% 2 7% 4 4 5% 4 5% 7% 41%	3962
April	1st to 10th	Day	13% 6% 2 7% 5% 4 4 4 5% 7% 45%	2280
	11th to 20th	Day	14% 7% 2 6% 4 3 5% 4 5% 6% 43%	2254
	21st to end	Day	13% 7% 3 7% 5% 5% 5% 4 6% 6% 40%	2351
May	1st to 10th	Day	19% 7% 2 6% 4 4 5% 4 6% 8% 35%	4082
	11th to 20th	Day	16% 9% 3 8% 5% 4 4 3 5% 7% 36%	4081
	21st to end	Day	11% 7% 3 7% 5% 5% 4 3 6% 8% 41%	4476
June	1st to 10th	Day	10% 6% 2 6% 5% 5% 5% 4 7% 8% 41%	2470
	11th to 20th	Day	5% 4 2 6% 5% 5% 6% 5% 7% 10% 45%	2589
	21st to end	Day	5% 5% 2 5% 6% 6% 5% 7% 8% 11% 39%	2660
July	1st to 10th	Day	6% 5% 2 8% 6% 6% 7% 6% 8% 10% 36%	4440
	11th to 20th	Day	9% 6% 3 6% 5% 5% 6% 5% 9% 11% 36%	4225
	21st to end	Day	17% 9% 4 10% 6% 6% 5% 5% 6% 8% 23%	4466
August	1st to 10th	Day	4 3 2 6% 4 5% 5% 5% 7% 11% 48%	3987
	11th to 20th	Day	6% 5% 2 6% 5% 6% 6% 5% 8% 12% 38%	3729
	21st to end	Day	6% 4 2 4 4 4 5% 4 6% 8% 53%	4180
September	1st to 10th	Day	12% 6% 2 6% 5% 5% 6% 4 6% 7% 40%	2228
	11th to 20th	Day	13% 5% 2 7% 4 5% 5% 4 5% 7% 43%	2090
	21st to end	Day	12% 7% 2 5% 3 4 4 3 6% 6% 47%	2090
October	1st to 10th	Day	10% 4 2 6% 3 3 3 3 5% 7% 55%	2090
	11th to 20th	Day	12% 6% 2 4 3 3 3 2 4 6% 54%	2061
	21st to end	Day	18% 5% 2 6% 4 4 3 2 5% 6% 45%	1782
November	1st to 10th	Day	12% 5% 1 4 3 2 3 3 4 6% 57%	1672
	11th to 20th	Day	14% 7% 2 4 4 3 4 3 5% 6% 48%	1710
	21st to end	Day	16% 7% 3 6% 4 4 3 3 5% 5% 45%	1710
December	1st to 10th	Day	23% 9% 3 6% 4 4 3 3 5% 5% 34%	1710
	11th to 20th	Day	17% 10% 3 7% 5% 4 4 4 4 5% 36%	2153
	21st to end	Day	17% 13% 4 8% 5% 4 5% 3 5% 8% 28%	3124
January	1st to 10th	Night	19% 10% 4 8% 4 3 3 3 4 6% 37%	4109
	11th to 20th	Night	20% 11% 3 7% 6% 4 3 3 3 4 34%	4120
	21st to end	Night	21% 13% 4 7% 3 3 3 3 3 4 35%	4299
February	1st to 10th	Night	20% 10% 4 8% 4 3 4 3 5% 6% 33%	2280
	11th to 20th	Night	22% 10% 4 7% 4 4 3 2 4 4 35%	2218
	21st to end	Night	24% 10% 4 7% 4 4 4 4 4 5% 31%	1884
March	1st to 10th	Night	24% 9% 3 7% 4 4 4 4 5% 5% 31%	3733
	11th to 20th	Night	13% 7% 2 5% 4 3 4 3 5% 5% 48%	3586
	21st to end	Night	13% 8% 2 8% 5% 4 4 4 5% 7% 40%	3698
April	1st to 10th	Night	12% 5% 2 6% 4 4 5% 3 5% 6% 47%	1900
	11th to 20th	Night	15% 7% 2 5% 3 2 3 3 5% 7% 47%	1875
	21st to end	Night	14% 7% 2 6% 4 4 4 4 5% 7% 43%	1828
May	1st to 10th	Night	13% 8% 3 6% 5% 4 5% 4 6% 7% 39%	2813
	11th to 20th	Night	13% 8% 2 7% 5% 5% 4 4 6% 8% 39%	2812
	21st to end	Night	7% 5% 3 7% 5% 5% 4 5% 7% 10% 43%	3079
June	1st to 10th	Night	7% 5% 3 7% 6% 4 4 4 6% 9% 45%	1710
	11th to 20th	Night	3 3 1 5% 4 4 4 4 7% 11% 54%	1585
	21st to end	Night	4 5% 2 6% 5% 4 5% 5% 7% 12% 45%	1520
July	1st to 10th	Night	6% 5% 3 6% 6% 5% 6% 5% 9% 10% 40%	2530
	11th to 20th	Night	7% 5% 2 6% 4 3 5% 4 8% 10% 44%	2733
	21st to end	Night	11% 9% 4 11% 6% 7% 6% 5% 8% 8% 25%	3087
August	1st to 10th	Night	5% 3 1 5% 3 4 4 3 5% 9% 58%	2938
	11th to 20th	Night	6% 4 2 5% 4 4 5% 4 8% 11% 48%	3100
	21st to end	Night	5% 3 1 4 4 3 5% 4 6% 8% 57%	3476
September	1st to 10th	Night	11% 5% 2 6% 4 4 5% 3 5% 7% 47%	1933
	11th to 20th	Night	10% 8% 2 5% 4 4 5% 4 6% 7% 45%	2090
	21st to end	Night	12% 4 2 5% 5% 4 4 3 5% 6% 51%	2090
October	1st to 10th	Night	10% 4 2 4 3 3 2 3 4 6% 60%	2090
	11th to 20th	Night	16% 4 2 5% 4 3 3 3 4 6% 51%	2099
	21st to end	Night	16% 7% 2 5% 3 2 3 3 4 7% 47%	2573
November	1st to 10th	Night	11% 5% 2 6% 4 3 3 3 4 5% 54%	2406
	11th to 20th	Night	13% 7% 2 5% 3 2 3 3 5% 7% 49%	2470
	21st to end	Night	17% 7% 3 5% 4 3 3 3 5% 5% 45%	2470
December	1st to 10th	Night	21% 11% 3 6% 5% 4 3 3 5% 6% 33%	2470
	11th to 20th	Night	17% 9% 3 7% 3 3 3 3 5% 5% 42%	3042
	21st to end	Night	15% 12% 4 10% 7% 5% 5% 3 5% 6% 28%	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 7% 18% 14% 3	1858
	21st to end	Day	51% 3 10% 16% 15% 5%	1570
March	1st to 10th	Day	55% 5% 7% 15% 12% 7%	3120
	11th to 20th	Day	39% 5% 9% 25% 17% 5%	3372
	21st to end	Day	41% 6% 9% 28% 14% 1	3962
April	1st to 10th	Day	38% 6% 11% 23% 18% 4	2280
	11th to 20th	Day	40% 6% 7% 21% 22% 4	2254
	21st to end	Day	42% 7% 10% 24% 16% 2	2351
May	1st to 10th	Day	45% 8% 12% 22% 13% 1	4120
	11th to 20th	Day	45% 9% 10% 25% 11%	4085
	21st to end	Day	39% 9% 11% 20% 20% 1	4489
June	1st to 10th	Day	37% 9% 11% 24% 16% 3	2470
	11th to 20th	Day	30% 9% 16% 23% 18% 3	2589
	21st to end	Day	33% 10% 18% 19% 15% 4	2660
July	1st to 10th	Day	38% 11% 18% 23% 8% 2	4371
	11th to 20th	Day	38% 8% 17% 28% 8% 2	4152
	21st to end	Day	56% 8% 12% 17% 6% 1	4324
August	1st to 10th	Day	27% 8% 14% 33% 17% 1	3974
	11th to 20th	Day	35% 7% 16% 25% 17% 1	3765
	21st to end	Day	28% 7% 10% 34% 19% 2	4179
September	1st to 10th	Day	40% 9% 10% 18% 18% 4	2228
	11th to 20th	Day	39% 6% 11% 23% 18% 2	2090
	21st to end	Day	35% 6% 11% 23% 21% 4	2090
October	1st to 10th	Day	29% 5% 9% 22% 28% 7%	2090
	11th to 20th	Day	32% 4 7% 22% 26% 8%	2061
	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	2219
	21st to end	Night	55% 5% 8% 13% 15% 4	1884
March	1st to 10th	Night	54% 6% 8% 12% 16% 4	3733
	11th to 20th	Night	36% 6% 8% 24% 14% 11%	3586
	21st to end	Night	43% 5% 9% 26% 16% 1	3698
April	1st to 10th	Night	37% 6% 9% 24% 21% 3	1900
	11th to 20th	Night	37% 5% 8% 19% 23% 7%	1875
	21st to end	Night	39% 6% 9% 27% 18% 1	1828
May	1st to 10th	Night	41% 10% 13% 23% 12% 1	2840
	11th to 20th	Night	41% 9% 13% 20% 16% 1	2813
	21st to end	Night	32% 11% 15% 22% 18% 2	3087
June	1st to 10th	Night	35% 7% 13% 27% 15% 3	1710
	11th to 20th	Night	22% 8% 17% 32% 18% 3	1585
	21st to end	Night	29% 9% 18% 27% 13% 4	1520
July	1st to 10th	Night	32% 11% 19% 26% 10% 2	2490
	11th to 20th	Night	31% 8% 18% 32% 9% 3	2683
	21st to end	Night	52% 11% 11% 17% 7% 1	2988
August	1st to 10th	Night	23% 7% 10% 38% 20% 1	2927
	11th to 20th	Night	28% 7% 20% 30% 14% 1	3130
	21st to end	Night	23% 7% 11% 34% 23% 2	3476
September	1st to 10th	Night	35% 7% 11% 24% 18% 6%	1933
	11th to 20th	Night	36% 7% 11% 20% 23% 3	2090
	21st to end	Night	33% 5% 11% 22% 23% 7%	2090
October	1st to 10th	Night	27% 5% 8% 22% 29% 9%	2090
	11th to 20th	Night	35% 4 8% 22% 24% 7%	2099
	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	30% 22% 30% 13% 4 1	270
	21st to end	Day	36% 13% 35% 13% 2	225
March	1st to 10th	Day	25% 16% 33% 19% 5% 2	270
	11th to 20th	Day	20% 16% 37% 20% 7% 1	391
	21st to end	Day	22% 15% 31% 20% 11% 1	506
April	1st to 10th	Day	20% 16% 24% 25% 14% 2	460
	11th to 20th	Day	18% 13% 26% 29% 13% 2	452
	21st to end	Day	18% 10% 29% 24% 14% 4	460
May	1st to 10th	Day	19% 10% 25% 25% 17% 5%	463
	11th to 20th	Day	17% 6% 21% 24% 21% 11%	487
	21st to end	Day	12% 5% 18% 25% 23% 18%	529
June	1st to 10th	Day	11% 4 17% 24% 26% 19%	490
	11th to 20th	Day	5% 2 14% 26% 33% 20%	609
	21st to end	Day	5% 2 18% 30% 28% 17%	680
July	1st to 10th	Day	7% 3 11% 25% 30% 23%	671
	11th to 20th	Day	9% 3 10% 20% 28% 29%	546
	21st to end	Day	11% 3 8% 26% 30% 23%	532
August	1st to 10th	Day	8% 3 6% 22% 37% 23%	486
	11th to 20th	Day	9% 4 10% 27% 37% 14%	479
	21st to end	Day	13% 1 6% 19% 33% 28%	539
September	1st to 10th	Day	12% 3 10% 21% 33% 21%	490
	11th to 20th	Day	14% 3 9% 21% 31% 22%	490
	21st to end	Day	17% 6% 14% 23% 28% 12%	490
October	1st to 10th	Day	13% 5% 12% 31% 28% 11%	490
	11th to 20th	Day	14% 8% 25% 30% 16% 7%	484
	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	743
	21st to end	Night	30% 13% 31% 24% 2	628
March	1st to 10th	Night	21% 11% 31% 31% 5%	760
	11th to 20th	Night	24% 10% 30% 28% 7% 1	760
	21st to end	Night	20% 10% 32% 30% 9%	768
April	1st to 10th	Night	14% 10% 30% 36% 9% 1	570
	11th to 20th	Night	18% 8% 31% 30% 12% 1	563
	21st to end	Night	17% 8% 28% 35% 11% 1	570
May	1st to 10th	Night	12% 4 30% 36% 17% 1	570
	11th to 20th	Night	13% 4 20% 36% 22% 4	561
	21st to end	Night	6% 2 15% 37% 35% 5%	617
June	1st to 10th	Night	8% 2 18% 37% 31% 5%	570
	11th to 20th	Night	4 2 10% 36% 41% 7%	570
	21st to end	Night	4 2 9% 41% 39% 6%	570
July	1st to 10th	Night	9% 2 6% 30% 44% 8%	555
	11th to 20th	Night	7% 3 8% 27% 45% 10%	552
	21st to end	Night	9% 1 6% 32% 44% 8%	624
August	1st to 10th	Night	8% 1 5% 27% 52% 7%	567
	11th to 20th	Night	7% 2 8% 36% 41% 5%	564
	21st to end	Night	10% 1 4 29% 48% 9%	627
September	1st to 10th	Night	12% 2 8% 31% 41% 6%	603
	11th to 20th	Night	12% 2 11% 30% 39% 6%	760
	21st to end	Night	13% 2 14% 32% 34% 5%	760
October	1st to 10th	Night	12% 4 15% 32% 32% 6%	760
	11th to 20th	Night	18% 6% 19% 35% 20% 2	759
	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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